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Brück Wolfram Manuel

Brück Wolfram Manuel

Professeur-e HES Associé-e

Main skills

Food Safety

Microbiome modulation

Food Fermentation

Host-Microbiome interactions

Bioactive compounds

Human Pathogens

Foodomics

  • Contact

  • Teaching

  • Research

  • Publications

  • Conferences

Main contract

Professeur-e HES Associé-e

Phone:+41 58 606 86 64

Desktop: ENP.19.N305

HES-SO Valais-Wallis - Haute Ecole d'Ingénierie
Rue de l'Industrie 23, 1950 Sion, CH
HEI - VS
Faculty
Chimie et sciences de la vie
Main Degree Programme
Ingénierie des Sciences du vivant

Wolfram Brück studied microbiology at St. Cloud State University, USA, before earning an M.Sc. in Medical and Molecular Microbiology from the University of Manchester, UK, and a Ph.D. in Food and Health Microbiology from the University of Reading, UK (2003), under Prof. Glenn Gibson, researching prebiotic milk peptides and infant health.

His career has spanned academic and industry roles across Denmark, the USA, Ireland, the UK, and Switzerland, including positions at Arla Foods Ingredients, the Harbor Branch Oceanographic Institution, the Letterkenny Institute of Technology (Ireland), and the Nestlé Research Center, Lausanne.

Since 2014, Brück has served as Professor for Microbiology, Food Safety, and Foodomics at HES-SO Valais-Wallis, where he heads the ISO 17025-accredited microbiology laboratories. He also serves as ISO 17025 Technical Expert for the Swiss Accreditation Service, Chair of the European Federation of Biotechnology's Plant, Agriculture and Food Division, and President of Swiss Food Research.

His research spans three interconnected domains: In functional foods, he investigates alternative protein sources alongside novel prebiotics and the application of machine learning to microbiome analysis. In biomedicine, his work centers on microbial exopolysaccharides, the microbial valorization of phytochemicals, and their health benefits and interactions with the gut microbiome. In climate change and environmental microbiology, he focuses on bioremediation, the extraction of bioactive compounds from food production byproducts, and the biorefinery of waste streams from the biofuels industry.

BSc HES-SO en Ingénierie des sciences du vivant - HES-SO Valais-Wallis - Haute Ecole d'Ingénierie
  • Microbiologie
  • Microbiologie alimentaire

Ongoing

SweetReclaim

Role: Collaborator

Description du projet:

SWEETReclaim is a project funded by the National Centre for Research and Development. Its aim is to develop snacks made from food industry by-products that support the gut microbiota and help regulate satiety. The Swiss-Polish initiative, focused on sustainable food solutions and carried out under the Polish-Swiss Cooperation Programme, is led by Prof. Anna Michalska-Ciechanowska from the Department of Fruit, Vegetable and Plant Nutraceutical Technology.

SWEETReclaim is a PLN 4.5 million research and development project led by Wrocław University of Environmental and Life Sciences. It is being carried out in collaboration with the Institute of Life Sciences at HES-SO Valais-Wallis in Sion, Switzerland; Laro, a Polish producer of snacks and products made with nuts, seeds and dried fruit; and the Swiss company ProSeed, which develops microwave-based drying and thermal treatment technologies applied to food industry by-products, enabling them to be transformed into ingredients.

Research team within HES-SO: Brück Wolfram Manuel

State: Ongoing

MycoStruct

Role: Collaborator

Financement: EU Horizon

Description du projet:

MycoStruct is a European collaborative research project developing the next generation of sustainable, mycelium-based whole-cut meat alternatives. The project brings together academic and industrial partners to advance innovative production technologies, optimize product quality, and ensure food safety, helping accelerate the transition toward more sustainable protein sources. The project is supported by the Circular Bio-based Europe Joint Undertaking and its members and co-funded by the European Union under Grant Agreement No. 101292039.

Research team within HES-SO: Brück Wolfram Manuel

State: Ongoing

Production and derivatisation of algal exopolysaccharides for functional foods

Role: Main Applicant

Description du projet:

Le projet consiste au développement de trois algues, Chlorella vulgaris, Nannochloropsis salina et Chlorella sorokiniana. Les exopolysaccharides seront extraits de celles-ci puis analysés pour déterminer les différents monosaccharides.

 

Research team within HES-SO: Brück Wolfram Manuel

State: Ongoing

Optimization of heterotrophic growth conditions of Chorella vulgaris, Nannochloropsis sp. and Arthrospira platensis.

Role: Main Applicant

Description du projet:

Meeting the demand for fast, cheap and ecologic food is a challenge. Microalgae are a good alternative because they are fast growing, do not need arable land and have a high protein content. The objectives are to optimize the growth and protein content of microaglae under heterotrophic condi-tions using three sources of carbon. Molasses with 80% glucose sirup, a pure cane molasses and oat bran. The last two were hydrolyzed with H2SO4 to decompose sucrose and starch into glucose and fructose.

Research team within HES-SO: Brück Wolfram Manuel

State: Ongoing

Tempehproduktion aus Nusspresskuchen

Role: Main Applicant

Description du projet:

Die weltweite Lebensmittelproduktion ist der größte Druck, den Menschen auf die Erde ausüben
und lokale Ökosysteme und die Stabilität des Erdsystems bedroht. Eine wachsende Weltbevölkerung mit Gesunden und nachhaltigen Lebensmittelsystemen zu versogen ist daher eine unmittelbare Herausforderung. Im Ramen dieser Problemstellung ist ein Bioraffineriekonzept in der Lebensmittelproduktion unabdingbar.  Mehrwertprodukte aus Abfällen der Lebensmittelindustrie können eine praktikable Strategie zur Reduzierung der Lebensmittelverschwendung darstellen, ohne die Lebensmittelsicherheit zu beeinträchtigen. Diese Nachhaltige Lebensmittelproduktion (engl. Sustainable Food Production) ist Teil der UN-Ziele für nachhaltige Entwicklung zur Bekämpfung des Klimawandels (Goal 12: Ensure sustainable consumption and production patterns). Um diese Strategie umzusetzen hat die Europäische Union den Horizon 2020 Green Deal Call angekündigt. Um die Relevanz des Institutes im Bereich Lebensmittelproduktion zu bewahren und auf diesem Feld besser agieren zu können, wurde die Gründung einer ITV-weiten Interessengruppe gestartet. Als Pilotprojekt und "Proof of Concept" für diese Gruppe wird im vorliegendem Projektantrag vorgeschlagen, Nusspresskuchen aus der Ölindustrie zu benutzten um mit Edelschimmel wie Aspergillus oryzae und Rhizopus spp. Tempeh herzustellen. Nusspresskuchen ist reich an Ellagitanninen die mit einigen Schimmelpilzen zu Ellagsäure umgesetzt werden können. Ellagsäure kann durch Darmbakterien in Urolithine umgesetzt werden, die antioxidative, anticancerogene, antivirale, antimutagene und antiparasitische wirkung zeigen. Diese Moleküle und stellen dadurch im Nusspresskuchentempeh einen Mehrwert für die Industrie und the Konsumenten da und bewaren zudem das Bioraffineriekonzept.

Research team within HES-SO: Brück Wolfram Manuel

State: Ongoing

Influence of exopolysaccharides from Chlorella sorokiniana and Chlorella vulgaris on the human gut microbiome

Role: Main Applicant

Description du projet:

Prebiotics are substances that promote the growth of probiotics, which are beneficial microorganisms that can, among others, modify the composition of the gut microbiota.

The source of prebiotics can be endogenous, like the human milk oligosaccharide, or exogenous, like certain dietary fibers (i.e.beta-glucans and pectins) present in a large variety of fruits and vegetables. But there are probably other sources of prebiotics.

The health benefits of green microalgae have been known for a very long time.

But the prebiotic potential of these microorganisms is not yet well known. Chlorella species, as well as other genera of green microalgae, produce, under certain conditions, complex sugars. These excreted sugars are called exopolysaccharides (EPS). And because they are not digestible by our “own” enzymes, they could be a good source of energy for probiotics like Lactobacillus and Bifidobacterium genera.

Research team within HES-SO: Brück Wolfram Manuel

State: Ongoing

Microbiological production of chitinoligosaccharides (COS) from Brown crab shell

Role: Main Applicant

Description du projet:

Chitin is the second most abundant biopolymer in the world next to cellulose and can be found in fungal cell walls and the exoskeletons of arthropods, in order to overcome the poor solubility obstacle to chitin application, soluble chitin oligosaccharides are obtained from this biomass, conventional chemical process are costly and cause environmental pollution. An alternative synthesis method is proposed on this research using new microorganisms. The aim of this project is to evaluate the yield of chitin oligosaccharides obtained by an alternative microbiological method from Chitin obtained from Brown crab shell.

Research team within HES-SO: Brück Wolfram Manuel

State: Ongoing

In vitro modulation of the intestinal microbiota and changes in microbial metabolism induced by fibers and phytochemicals

Role: Main Applicant

Description du projet:

The human gut microbiota plays a critical role in maintaining host health, both within the gastrointestinal tract and systemically through the absorption of metabolites. A healthy gut microbiota protects from invasion and colonisation of the gut by enteropathogens by (i) colonisation resistance, (ii) producing a range of metabolic substrates which are utilized by the host and (iii) stimulating the immune system in a non-inflammatory manner. Novel foods or GRAS (generally regarded as safe) compounds of food origin have the potential to modulate the microbiota of the human gut and/or causing a beneficial change in the metabolic profile of the microbiome.  Through collaboration with other work packages in this project, novel fibers and phytochemicals will be assessed in vitro using a validated two-sage model of the human gut. The model allows a for reproducible colonization process, which in combination with the other criteria allows different treatments to be compared without health risks to a host. Results will be analyzed using a combination of metagenomics and metatranscriptomics provided by next generation sequencing (Hepia, Geneva) and qPCR for the microbiome and GC-MS, LC-MS and NMR for metabolome and metabonome analysis (Hes-so VS, Sion). The development of these compounds is of significant interest to the “Healthfood” programme as they have the potential to attract new commercial collaborations that would further increase the HES-SO’s research output and create new marketable IP.

Research team within HES-SO: Brück Wolfram Manuel , Lefort François

Durée du projet: - 16.07.2021

Montant global du projet: 72'140 CHF

State: Ongoing

ML4Microbiome

Role: Partner

Financement: COST Action

Description du projet:

In recent years, the human microbiome has been characterised in great detail in several large-scale studies as a key player in intestinal and non-intestinal diseases, e.g. inflammatory bowel disease, diabetes and liver cirrhosis, along with brain development and behaviour. As more associations between microbiome and phenotypes are elucidated, research focus is now shifting towards causality and clinical use for diagnostics, prognostics and therapeutics, where some promising applications have recently been showcased. Microbiome data are inherently convoluted, noisy and highly variable, and non-standard analytical methodologies are therefore required to unlock its clinical and scientific potential. While a range of statistical modelling and Machine Learning (ML) methods are now available, sub-optimal implementation often leads to errors, over-fitting and misleading results, due to a lack of good analytical practices and ML expertise in the microbiome community. Thus, this COST Action network will create productive symbiosis between discoveryoriented microbiome researchers and data-driven ML experts, through regular meetings, workshops and training courses. Together, it will first optimise and then standardise the use of said techniques, following the creation of publicly available benchmark datasets. Correct usage of these approaches will allow for better identification of predictive and discriminatory ‘omics’ features, increase study repeatability, and provide mechanistic insights into possible causal or contributing roles of the microbiome. This Action will also investigate automation opportunities and define priority areas for novel development of ML/Statistics methods targeting microbiome data. Thus, this COST Action will open novel and exciting avenues within the fields of both ML/Statistics and microbiome research.

Research team within HES-SO: Brück Wolfram Manuel

Url of the project site: https://www.ml4microbiome.eu/

State: Ongoing

2026

Basswood-anode soil microbial fuel cell-based biosensor for self-sustained and wide-ranged heavy metal detection
Scientific paper ArODES

Syed Zaghum Abbas, So Hyeon Choi, Wolfram Manuel Brück, Bharath Samannan, Jae Kyung Jang, Taeyoung Kim

Bioresource Technology,  2026, 444, 134013

Link to the publication

Summary:

Soil microbial fuel cells (SMFCs) offer a promising platform for soil-powered biosensing, but their performance relies on effective electroactive bacterial colonization of the anode. To improve this, four wood types were assessed as porous bio-scaffolds, examining their surface area, pore structure, and microarchitecture before and after carbonization. Basswood showed the most advantageous structure, with uniformly distributed vessels and aligned channels that remained intact after carbonization. The resulting carbonized basswood (CBW) anode exhibited a higher surface area, improved conductivity (12–13.5 mS/cm), and reduced internal resistance. When used in SMFCs, CBW achieved a maximum power density of 30 mW/m2 approximately four times higher than non-carbonized carbon felt (NCF) and expanded the heavy-metal detection range by ∼35%. CBW also supported dense, diverse biofilms and maintained stable output for 180 days. These results highlight carbonized basswood as a cost-effective, robust anode material for long-term, self-powered environmental biosensing.

Modulation of the human gut microbiota by corn arabinoxylans : insights from in vitro batch culture fermentation
Scientific paper ArODES

Fatma Boukid, Aline Adler, Wolfram Manuel Brück

Journal of Functional Foods,  2026, 138, 107193

Link to the publication

Summary:

Arabinoxylans (AX) are dietary fibers with strong prebiotic potential to modulate gut microbiota. Six samples (S1–S5 corn AX; S6 inulin as control) were assessed in a 24-h in vitro fermentation model, evaluating microbial composition and short-chain fatty acid (SCFA) production. Distinct, structure-dependent effects were observed. High-molecular-weight AX (S1, S2) selectively enriched Faecalibacterium and sustained acetate and butyrate production throughout fermentation. Medium molecular weight AX (S3) favored Blautia and Oscillospira, with moderate SCFA accumulation. Low molecular weight AX (S4, S5) promoted Blautia, Collinsella, and Faecalibacterium, supporting gradual and sustained SCFA release. In contrast, inulin (S6) stimulated Akkermansia and Collinsella, inducing a rapid early increase in acetate and lactate followed by a decline. Overall, AX molecular weight and structure critically shape microbial responses and metabolic outputs, with high-molecular-weight AX enabling prolonged butyrogenic activity, while inulin drives fast, short-lived fermentation.

Encapsulation of interesterified red palm oil and sacha inchi oil by using canna porous starch (Canna edulis Kerr.) as infant milk formula fortification
Scientific paper ArODES

Rafaella Chandraseta Megananda, Atharida Salma Nafisa, Sri Raharjo, Wolfram Manuel Brück, Lucia Dhiantika Witasari

Industrial Crops and Products,  2026, 241, 122607

Link to the publication

Summary:

Enzymatic interesterification (EIE) of red palm oil (RPO) and sacha inchi oil (SIO) is used in the preparation of infant milk formula due to its high content of polyunsaturated fatty acids (PUFAs) and palmitic acid at the sn-2 position. However, PUFAs are highly prone to oxidation, making encapsulation necessary to preserve their integrity. In this study, porous starch (PS) from canna (Canna edulis Kerr.), prepared via enzymatic hydrolysis, was used as a wall material for encapsulation.We encapsulated the interesterified RPO-SIO using canna PS, studied the characterization of the encapsulation, compared with native starch, and studied the application in infant milk formula. The best encapsulation formulation was 37.5 %:37.5 %:25 % (canna PS: gum arabic: skim milk) with 94.67 % encapsulation efficiency. Encapsulation using PS yielded higher water content, water activity, and solubility compared to that using native starch. X-ray diffraction (XRD) and Fourier-transformed infrared spectroscopy (FTIR) analyses showed that oil could be encapsulated in PS. Scanning electron microscopy imaging exhibited less agglomeration in the PS. PS showed good protection from oxidation due to the lower peroxide value and p-anisidine value. The protective effect of porous starch (PS) was attributed to its fatty acid composition, which helped preserve polyunsaturated fatty acids (PUFAs). The fortified infant milk formula exhibited a yellowish color change and an increase in PUFA content due to the higher powdered oil content. Sensory analysis revealed that panelists could distinguish between the fortified and commercial milk. This study concluded that canna PS is a viable option for fortifying infant milk formula and demonstrated that increasing powdered oil content enhances PUFA levels.

2025

Antifungal and antibacterial activities of Kenikir leaf (Cosmos caudatus Kunth) essential oil against common foodborne pathogens
Scientific paper ArODES

Nur Afni Oktri Fiana, Deborah Patricia Lizar, Olivia Martha Florencia, Arif Ramadhan, Nanda Nurul Izzah, Siti Zainatun Wasilah, Sari Darmasiwi, Wolfram Manuel Brück, Lucia Dhiantika Witasari

BIO Web of Conferences,  2025, 192, 03001

Link to the publication

Summary:

Natural antimicrobial agents are increasingly attracting interest as safer alternatives. Cosmos caudatus Kunth., an edible plant native to tropical regions, contains bioactive compounds such as polyphenols, flavonoids, tannins, saponins, alkaloids, and essential oils, all of which have been reported to exhibit potential as natural antimicrobial food preservatives. This study aimed to evaluate the antibacterial and antifungal activities of C. caudatus leaf essential oil against various foodborne pathogens. The findings showed that the fungal strains were more susceptible to C. caudatus leaf essential oil than the bacterial strains. Moreover, the essential oil exhibited stronger activity against Gram-positive bacteria than Gram- negative bacteria. The minimum inhibitory concentration (MIC) values for A. niger FNCC 6114 and A. flavus FNCC 6181 were 6.25 and 12.5 μL·mL-1, respectively, with both fungi showing minimum fungal concentration (MFC) values of 50 μL·mL-1. For S. aureus ATCC 25923, the MIC and minimum bactericidal concentration (MBC) values were 31.25 and 250 μL·mL-1, respectively. Additionally, P. aeruginosa ATCC 27853 and E. coli ATCC 25922 exhibited MBC and MIC values of 500 and 62.5 μL·mL-1, respectively. These results suggest that C. caudatus leaf essential oil holds promise as a natural antimicrobial agent.

Whey protein hydrolysates enhance grapevine resilience to abiotic and biotic stresses
Scientific paper ArODES

Esteban Alfonso, Wilfried Andlauer, Wolfram Manuel Brück, Markus Rienth

Frontiers in Plant Science,  2025, 16

Link to the publication

Summary:

Introduction: The growing need for sustainable viticulture has increased interest in biostimulants that enhance plant resilience to abiotic and biotic stresses. This study evaluates the efficacy of whey-derived protein hydrolysates (PHs) in improving Vitis vinifera cv. Cabernet Sauvignon tolerance to combined heat and drought stress and reducing pathogen infections. Methods: Potted grapevines were subjected to 40°C heat stress without irrigation and treated with either water or PHs. Physiological parameters as well as key stress- and photosynthesis-related genes expression were monitored. The antimicrobial effects of PHs against Plasmopara viticola and Botrytis cinerea were also assessed. Results: PHs-treated plants exhibited a faster recovery of photosynthetic activity than control plants and maintained normal sub-stomatal CO2 concentrations under combined abiotic stress. PHs treatment significantly upregulated heat stress-responsive genes (HSFA2, HSP101) and mitigated the stress-induced decline in photosynthesis-related genes (LHCA3, RbcS). Moreover, PHs significantly enhanced grapevine drought tolerance, as indicated by higher leaf water potential values and expression of drought-responsive genes (NCED1, TIP2;1). Additionally, PHs demonstrated a direct toxic effect on P. viticola, inhibiting zoospore germination and reducing sporulation on leaf discs, while reducing B. cinerea infection in berries when applied post-infection. Conclusion: In the tested conditions, whey PHs serve as effective biostimulants, enhancing grapevine resilience to combined drought and heat stress while providing protection against grapevine pathogens. Although further validation in vineyard conditions is needed, this dual benefit of PHs may propose a potential sustainable alternative to reduce chemical inputs in viticulture, contributing to more environmentally friendly agricultural practices.

Solid-state fermentation of agro-industrial by-products
Scientific paper ArODES

Yannick Erismann, Wolfram Manuel Brück, Wilfried Andlauer

Nutraceuticals,  2025, 5, 2, 11

Link to the publication

Summary:

The solid-state fermentation (SSF) of agro-industrial by-products such as okara, pomegranate peel, and cranberry pomace presents a sustainable approach to enhance the release of bioactive compounds. This study investigated the effects of different microbial cultures—Rhizopus oligosporus, Aspergillus oryzae, Streptococcus thermophilus, and a co-culture of R. oligosporus and S. thermophilus—on the bioconversion of bioactive compounds in 100% okara, okara with 2% pomegranate peel, and okara with 1% cranberry pomace. The objective was to assess whether co-culture fermentation with molds and S. thermophilus augments the release of bioactive compounds in okara-based fermentations through synergistic enzymatic activity. Over a period of 72 h, isoflavone transformation (daidzin, daidzein, genistin, and genistein), pH evolution, and water activity were assessed. The co-culture system exhibited improved bioconversion, leading to significant (p < 0.01) increases in daidzein and genistein in pure okara compared to the starting material. The highest polyphenol content (0.908 mg/g) and antioxidant capacity (24.9 mg Trolox eq/g) were recorded in 100% okara. However, pomegranate peel inhibited β-glucosidase activity, delaying the release of isoflavone aglycones. These findings confirm that co-culture fermentation is an effective strategy for enhancing the bioactive properties of okara-based fermentations. This facilitates the release of bioactive aglycones and supports the upcycling of agro-industrial by-products into functional food ingredients. Future research should focus on optimizing fermentation parameters to further enhance the release of bioactive compounds.

Whey protein hydrolysates enhance grapevine resilience to abiotic and biotic stresses
Scientific paper

Alfonso Esteban, Andlauer Wilfried, Brück Wolfram Manuel, Rienth Markus

Frontiers in Plant Science, 2025

Link to the publication

Valorization of rosehip (rosa canina L.) pomace using unconventional carbohydrate carriers for beverage obtainment
Scientific paper ArODES

Anna Michalska-Ciechanowska, Jessica Brzezowska, Nancy Nicolet, Kamil Haladyn, Wolfram Manuel Brück, Aleksandra Hendrysiak, Wilfried Andlauer

Molecules,  2025, 30, 1, 141

Link to the publication

Summary:

Rosehip is of notable scientific interest due to its rich content of bioactives and its wide-ranging applications in nutrition, cosmetics and pharmaceuticals. The valorization of rosehip by-products, such as pomace, is highly significant for promoting sustainability. This study investigates the development of rosehip-based powders and beverage prototypes derived from both juice and pomace to evaluate the potential use of pomace in instant beverage design and compare it with juice-based formulations. Three matrices were evaluated: non-pasteurized and pasteurized juice, as well as non-pasteurized pomace preparations. Powders were produced by freeze- and spray drying using maltodextrin, inulin and unconventional carriers, i.e., palatinose and trehalose. The results demonstrated that carrier addition significantly influenced the physical and techno-functional properties of the powders, such as moisture content (below 10%), water activity (below 0.35), solubility (above 85%), and color indexes (yellowness and browning). The water absorption capacity varied with drying techniques, particularly for inulin-enriched samples, while the matrix type affected the ascorbic acid content. Non-pasteurized pomace powders exhibited a higher antioxidant capacity (67.7 mmol Trolox/100 g dry matter) than their juice counterparts (52.2 mmol Trolox/100 g dry matter), highlighting the potential of the pomace matrix for beverage production. Because of their favorable properties, spray-dried samples were also selected for reconstitution into prototype beverages, among which those obtained from pomace showed a higher antioxidant potential. An analysis of particle sizes, which ranged between 34 nm and 7363 nm, revealed potential interactions between the carrier and matrix, reflected in the distinct behavior of carrier-only samples. Both the carrier type and the matrix significantly contributed to the final properties of the beverages, providing valuable insights for the design of functional food products.

2024

Heat stress resistance in chlorella vulgaris enhanced by hydrolyzed whey proteins
Scientific paper ArODES

Wolfram Manuel Brück, Esteban Alfonso, Markus Rienth, Wilfried Andlauer

Agronomy,  2024, 14, 12, 2854

Link to the publication

Summary:

Plant biologists have long used various model organisms, such as Arabidopsis thaliana, to study biological processes. The emergence of algal model organisms in recent years greatly facilitated plant research due to their compact genomes with a very low level of functional redundancy and their physiological properties. Here, the green microalga Chlorella vulgaris has been used as a model organism to study the effect of whey hydrolysates against heat stress in vascular plants. Cell density in culture, as well as chlorophyll and carotenoid concentrations, were monitored during an initial growth phase, followed by a heat stress phase and a subsequent recovery phase. Results showed that whey hydrolysates promoted the recovery of heat-stressed C. vulgaris and showed improved growth rates and generation times after heat stress compared to cells grown in BG-11 only. Similarly, the production of chlorophyll a, chlorophyll b, total chlorophyll and total carotenoids was improved in comparison to cells grown only in BG-11. The results may aid the development of novel biostimulants that protect crops from climate change due to higher throughput and shorter study times compared to traditional plant models.

The future backbone of nutritional science : integrating public health priorities with system-oriented precision nutrition
Scientific paper ArODES

Guy Vergères, Murielle Bochud, Corinne Jotterand Chaparro, Diego Moretti, Giulia Pestoni, Nicole Probst-Hensch, Serge Rezzi, Sabine Rohrmann, Wolfram Manuel Brück

British Journal of Nutrition,  2024, 132, 5, 651-666

Link to the publication

Summary:

Adopting policies that promote health for the entire biosphere (One Health) requires human societies to transition towards a more sustainable food supply as well as to deepen the understanding of the metabolic and health effects of evolving food habits. At the same time, life sciences are experiencing rapid and groundbreaking technological developments, in particular in laboratory analytics and biocomputing, placing nutrition research in an unprecedented position to produce knowledge that can be translated into practice in line with One Health policies. In this dynamic context, nutrition research needs to be strategically organised to respond to these societal expectations. One key element of this strategy is to integrate precision nutrition into epidemiological research. This position article therefore reviews the recent developments in nutrition research and proposes how they could be integrated into cohort studies, with a focus on the Swiss research landscape specifically.

Effects of intrinsic and extrinsic growth factors on virulence gene expression of foodborne pathogens in vitro and in food model systems; a review
Scientific paper ArODES

Hedayat Hosseini, Razzagh Magmoudi, Babak Pakbin, Leila Manafi, Setayesh Hosseini, Zahra Pilevar, Wolfram Manuel Brück

Food Science & Nutrition,  2024

Link to the publication

Summary:

Since foodborne diseases are one of the major causes of human hospitalization and death, one of the main challenges to food safety is the elimination or reduction of pathogens from food products throughout the food production chain. Pathogens, such as Salmonella species, Escherichia coli, Bacillus cereus, Clostridium species, Staphylococcus aureus, Listeria monocytogenes, Campylobacter species, etc., enter the consumer's body through the consumption of contaminated food and eventually cause disease, disability, and death in humans. In particular, the expression of virulence genes of these pathogens in various food environments containing them has been repeatedly reported, which is a key issue for the survival and pathogenicity of the pathogen. Hence, in this review, the interventions to prevent and control foodborne diseases, such as the application of natural preservatives, redox potential, heat treatments, high-pressure processing, and gaseous atmosphere, are discussed based on the literature. Moreover, the effects of various environmental conditions on bacterial gene expression are comprehensively reviewed. In conclusion, the effects of intrinsic and extrinsic factors on the growth and pathogenicity of bacteria are very complicated. The information obtained from the current study can be used to develop new control strategies, improve food safety, and ensure human health.

Supplemented infant formula and human breast milk show similar patterns in modulating infant microbiota composition and function in vitro
Scientific paper ArODES

Klaudyna Borewicz, Wolfram Manuel Brück

International Journal of Molecular Sciences,  25, 2024, 3, 1806

Link to the publication

Summary:

The gut microbiota of healthy breastfed infants is often dominated by bifidobacteria. In an effort to mimic the microbiota of breastfed infants, modern formulas are fortified with bioactive and bifidogenic ingredients. These ingredients promote the optimal health and development of infants as well as the development of the infant microbiota. Here, we used INFOGEST and an in vitro batch fermentation model to investigate the gut health-promoting effects of a commercial infant formula supplemented with a blend containing docosahexaenoic acid (DHA) (20 mg/100 kcal), polydextrose and galactooligosaccharides (PDX/GOS) (4 g/L, 1:1 ratio), milk fat globule membrane (MFGM) (5 g/L), lactoferrin (0.6 g/L), and Bifidobacterium animalis subsp. lactis, BB-12 (BB-12) (106 CFU/g). Using fecal inoculates from three healthy infants, we assessed microbiota changes, the bifidogenic effect, and the short-chain fatty acid (SCFA) production of the supplemented test formula and compared those with data obtained from an unsupplemented base formula and from the breast milk control. Our results show that even after INFOGEST digestion of the formula, the supplemented formula can still maintain its bioactivity and modulate infants’ microbiota composition, promote faster bifidobacterial growth, and stimulate production of SCFAs. Thus, it may be concluded that the test formula containing a bioactive blend promotes infant gut microbiota and SCFA profile to something similar, but not identical to those of breastfed infants.

Probiotic Bacillus strains inhibit growth, biofilm formation, and virulence gene expression of Listeria monocytogenes
Scientific paper ArODES

Behrooz, Alizadeh Behbahani, Mohammad Noshad, Alireza Vasiee, Wolfram Manuel Brück

LWT,  191 (2024), 115596

Link to the publication

Summary:

This research aimed to evaluate the probiotic potential and anti-biofilm properties of Bacillus species isolated from dairy sludge, namely Bacillus subtilis GS3 (DS-1), Bacillus cereus BF2 (DS-2), Bacillus velezensis DM (DS-3), and Bacillus thuringiensis JB (DS-4). These strains exhibited tolerance to gastrointestinal fluids, bile salt, phenol, NaCl, and temperature variations. Moreover, they demonstrated notable cell surface hydrophobicity (70.80–89.30%), auto-aggregation (79.30–92.70%), and cholesterol removal (20.12–59.46%). Additionally, the strains displayed antioxidant activity and susceptibility to a wide range of antibiotics. The cell-free supernatants (CFS) of the strains exhibited inhibitory effects against Listeria monocytogenes ATCC 19115, with minimum inhibitory concentrations (MIC) observed at 12.5%, 25%, 25%, and 50% v/v for DS-1, DS-2, DS-3, and DS-4, respectively. The CFS also showed degradation and inhibition of L. monocytogenes biofilms, affecting adhesion, hydrophobicity, auto-aggregation, and exopolysaccharide production. Notably, DS-1 CFS suppressed the expression of genes associated with biofilm formation in L. monocytogenes, including those related to quorum sensing, virulence factors, and flagella. The antibacterial activity of CFS against L. monocytogenes was further confirmed by scanning electron microscopy. Particularly, the CFS of Bacillus spp., especially B. subtilis GS3, exhibited a strong inhibitory effect on the biofilm formation of L. monocytogenes.

Fermentative liberation and transformation of bioactive compounds : ellagic acid from nut press cake ellagitannins
Scientific paper ArODES

Wolfram Manuel Brück, Yannick Erismann, Wilfried Andlauer

Applied Sciences,  14, 2024, 3, 1141

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Summary:

Oil extracted from walnuts leaves behind large amounts of defatted press cake that still retains valuable nutrients. Solid state fermentation (SSF) is a promising method to liberate bioactive compounds from food by-products. Aspergillus oryzae, Rhizopus oligosporus, and Streptococcus thermophilus possess the necessary enzymes to utilize these nutrients from the walnut press cake (WPC) and convert walnut ellagitannins into ellagic acid and urolithins. This study conducted SSF with WPC to release ellagic acid from ellagitannins and form urolithins. The growth of the two filamentous fungi could be observed visually and the growth of Streptococcus thermophilus was confirmed by plate count technique. Extracts from fermented products were subjected to analysis using HPLC–DAD to measure the release of ellagic acid from ellagitannins. Additionally, a more sensitive UHPLC–MS method was employed to screen fermented samples for urolithin A. The ellagic acid content exhibited no perceptible change but was already present in the press cake before and after all fermentations. Urolithin A was undetectable, even with the more sensitive MS method. All studies showing urolithin A formation were conducted under anaerobic conditions. This might be a basic prerequisite for the transformation of ellagic acid to urolithins.

2023

Burden of breast cancer and attributable risk factors in the North Africa and Middle East region, 1990–2019 : a systematic analysis for the global burden of disease study 2019
Scientific paper ArODES

Sina Azadnajafabad, Sahar Saeedi Moghaddam, Esmaeil Mohammadi, Negar Rezaei, Mohammad-Mahdi Rashidi, Nazila Rezaei, Ali H. Mokdad, Bagher Larijani, Farshad Farzadfar, GBD 2019 NAME Breast Cancer Collaborators, Wolfram Manuel Brück

Frontiers in Oncology,  13, 2023, 1132816

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Summary:

Background: Breast cancer (BC) is the most common cancer in women globally. The North Africa and Middle East (NAME) region is coping hard with the burden of BC. We aimed to present the latest epidemiology of BC and its risk factors in this region. Methods: We retrieved the data on BC burden and risk factors from the Global Burden of Disease Study 2019 to describe BC status in the 21 countries of the NAME region from 1990 to 2019. We explored BC incidence, prevalence, deaths, disability-adjusted life years (DALYs), and attributable burden to seven risk factors of female BC, namely, alcohol use, diet high in red meat, low physical activity, smoking, secondhand smoke, high body mass index, and high fasting plasma glucose. Decomposition analysis on BC incidence trend was done to find out the contributing factors to this cancer’s growth. Results: In 2019, there were 835,576 (95% uncertainty interval: 741,968 to 944,851) female and 10,938 (9,030 to 13,256) male prevalent cases of BC in the NAME region. This number leads to 35,405 (30,676 to 40,571) deaths among female patients and 809 (654 to 1,002) deaths in male patients this year. BC was responsible for 1,222,835 (1,053,073 to 1,411,009) DALYs among female patients in 2019, with a greater proportion (94.9%) of burden in years of life lost (YLLs). The major contributor to female BC incidence increase in the past three decades was found to be increase in age-specific incidence rates of BC (227.5%), compared to population growth (73.8%) and aging (81.8%). The behavioral risk factors were responsible for majority of attributable female BC burden (DALYs: 106,026 [66,614 to 144,247]). High fasting plasma glucose was found to be the risk factor with the largest effect (DALYs: 84,912 [17,377 to 192,838]) on female BC burden. Conclusion: The increasing incidence and burden of BC in the NAME region is remarkable, especially when considering limited resources in the developing countries of this region. Proper policies like expanding screening programs and careful resource management are needed to effectively manage BC burden.

Essential oils of five syzygium species growing wild in Vietnam : chemical compositions and antimicrobial and mosquito larvicidal potentials
Scientific paper ArODES

Le Thi Huong, Nguyen Huy Hung, Nguyen Ngoc Linh, Ty Viet Pham, Do Ngoc Dai, Nguyen Quang Hop, William N. Stezer, Ninh Te Son, Wilfried Andlauer, Wolfram Manuel Brück

Molecules,  28 (2023), 22, 7505

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Summary:

The essential oils of five Vietnamese Syzygium species (Syzygium levinei, S. acuminatissimum, S. vestitum, S. cumini, and S. buxifolium) were first hydro-distilled and analyzed using GC-FID/MS (gas chromatography–flame ionization detection/mass spectrometry). Monoterpene hydrocarbons, sesquiterpene hydrocarbons, and oxygenated sesquiterpenoids were the main chemical classes in these oils. All these essential oils showed good–excellent antimicrobial activities against Gram-positive bacteria Enterococcus faecalis, Staphylococcus aureus, and Bacillus cereus, and the yeast Candida albicans. S. levinei leaf essential oil, rich in bicyclogermacrene (25.3%), (E)-β-elemene (12.2%), (E)-caryophyllene (8.2%), and β-selinene (7.4%), as well as S. acuminatissimum fruit essential oil containing (E)-caryophyllene (14.2%), α-pinene (12.1%), caryophyllene oxide (10.9%), β-selinene (10.8%), α-selinene (8.0%), and α-humulene (5.7%), established the same MIC value of 8 µg/mL against E. faecalis and B. cereus, which were much better than the positive control streptomycin (MIC 128–256 µg/mL). The studied essential oils showed the potential to defend against mosquitoes since they caused the 24 and 48 h LC50 values of less than 50 µg/mL against the growth of Culex quinquefasciatus and Aedes aegypti larvae. Especially, S. buxifolium leaf essential oil strongly inhibited Ae. aegypti larvae with 24 and 48 h LC50 values of 6.73 and 6.73 µg/mL, respectively, and 24 and 48 h LC90 values of 13.37 and 10.83 µg/mL, respectively. These findings imply that Vietnamese Syzygium essential oils might have potential for use as supplemental antibacterial agents or as “green” alternatives for the control of mosquitoes.

Atmospheric plasma sources as potential tools for surface and hand disinfection
Scientific paper ArODES

Wolfram Manuel Brück, Alain Savary, Martine Baudin, Martine Emery Mabillard, Gilles Courret

Hygiene,  3, 4, 406-415

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Summary:

Good hand hygiene has proven to be essential in reducing the uncontrolled spread of human pathogens. Cold atmospheric plasma (CAP) may provide an alternative to disinfecting hands with ethanol-based handrubs when handwashing facilities are unavailable. CAP can be safely applied to the skin if the energy is well controlled. In this study, radio frequency (RF) and direct current (DC) plasma sources were built with a pin-to-mesh electrodes configuration inside a fused silica tube with a 5 mm inner diameter. Microbiological assays based on EN 13697:2015+A1:2019 using Escherichia coli DSM 682 or Staphylococcus epidermidis DSM 20044 were used to examine the antimicrobial effect of various plasma conditions. Metal and silicone disks that model skin were used as inoculation matrices. The prototype air RF CAP achieved significant disinfection in the MHz range on stainless steel and silicone substrates. This is equivalent to half the performance of direct current CAP, which is only effective on conductive substrates. Using only electricity and air CAP could, with further optimization to increase its efficacy, replace or complement current hand disinfection methods, and mitigate the economic burden of public health crises in the future.

Prevalence of foodborne bacterial pathogens and antibiotic resistance genes in sweets from local markets in Iran
Scientific paper ArODES

Babak Pakbin, Zahra Amani, Zahra Rahimi, Somayeh Najafi, Behnaz Familsatarian, Alireza Khakpoor, Wolfram Manuel Brück, Thomas B. Brück

Foods,  12 (2023), 19, 3645

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Summary:

Background: This study aimed to investigate the prevalences of some important antibiotic-resistance genes (ARGs) and foodborne bacterial pathogens in sweet samples collected from local markets in Iran. Methods: Forty sweet samples were collected. Foodborne pathogens and ARGs were detected in the sweet samples by conventional and multiplex PCR assays using species-specific primers. Results: Staphylococcus aureus, Cronobacter sakazakii, Shigella spp., Campylobacter jejuni, and Campylobacter coli were detected and identified in 47.5%, 20%, 45%, 5%, and 30% of the sweet samples, respectively. We found S. aureus and Shigella spp. were the most prevalent bacterial pathogens. S. aureus was found to be the most frequent pathogenic bacteria profiled in these samples. We also found a significant correlation between the presence of C. coli and Cr. sakazakii. We detected the blaSHV resistance gene in 97.5% of the sweet samples; however, blaTEM was detected in only one sample (2.5%). Conclusions: Regarding these results, we suggest preventive strategies such as implementing automation of food processing; monitoring the personal hygiene and health of food handlers, and testing regularly for antibiotic resistance in raw materials and products.

Kaltplasmadesinfektion für die Hand- und Oberflächenhygiene
Professional paper ArODES

Wolfram Manuel Brück, Gilles Courret

Lebensmittel-Technologie,  56, 2023, 9, 12-13

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Summary:

Die Hochschule für Inegnieurwissenschaften der HES-SO Wallis und die Hochschule für Wirtschaft und Ingenieurwissenschaften des Kantons Waadt stellen ihre Desinfektionsmethode vor.

Editorial : Sustainable production of marine natural products - from discovery to application
Scientific paper ArODES

Wolfram Manuel Brück, Lory Santiago-Vazquez, Thomas B. Brück

Frontiers in Marine Science,  10 (2023), 1188090

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Effects of probiotic saccharomyces boulardii supernatant on viability, nano-mechanical properties of cytoplasmic membrane and pro-inflammatory gene expression in human gastric cancer AGS cells
Scientific paper ArODES

Babak Pakbin, Samaneh Allahyari, Shaghayegh Pishkhan Dibazar, Leila Zolghadr, Neda Karami Chermahini, Wolfram Manuel Brück, Thomas B. Brück, Razzagh Mahmoudi

International Journal of Molecular Sciences,  24 (2023), 9, 7945

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Summary:

Background: Gastric cancer has been recognized as the second most probable cause of death in humans from cancer diseases around the world. Postbiotics, supernatant, and metabolites from probiotic microorganisms have recently been used widely to prevent and treat cancer diseases in humans, without any undesirable side effects. This study explores the antiproliferative and antitumor activities of the probiotic Saccharomyces cerevisiae var. boulardii supernatant (SBS) against AGS cancer cells, a human gastric adenocarcinoma cell line. Methods: We evaluated cell growth inhibitory and mechanical properties of the cytoplasmic membrane and the downregulation of survivin and proinflammatory genes in AGS cells treated with SBS after 24 and 48 h. Results: SBS significantly inhibits the AGS cell growth, and the concentrations with IC50 values after 24 and 48 h treatments are measured as 2266 and 1956 µg/mL, respectively. Regarding the AFM images and Young`s modulus analysis, SBS significantly induces morphological changes in the cytoplasmic membrane of the treated AGS cells. Expression of survivin, NFƙB, and IL-8 genes is significantly suppressed in AGS cells treated with SBS. Conclusions: Considering the antitumor activities of SBS on AGS cell line, it can be regarded as a prospective therapeutic and preventive strategy against human stomach cancer disease.

ACE2-inhibitory effects of bromelain and ficin in colon cancer cells
Scientific paper ArODES

Babak Pakbin, Shaghayegh Pishkhan Dibazar, Samaneh Allahyari, Hanifeh Shariatifar, Wolfram Manuel Brück, Alireza Farasat

Medicina,  59 (2023), 2, 301

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Summary:

Background and Objectives: Bromelain and ficin are aqueous extracts from fruits of Ananas comosus and Ficus carcia plants, used widely for medical applications. Angiotensin-converting enzyme 2 (ACE2) is a homolog of ACE, degrading Ang II to angiotensin 1-7 and decreasing the cellular concentration of Ang II. Materials and Methods: In this study, we investigated the ACE2-inhibitory, antiproliferative, and apoptosis-inducing effects of ficin and bromelain on caco-2 cells. Results: We found that bromelain and ficin significantly reduced the viability of human colon cancer cells with IC50 value concentrations of 8.8 and 4.2 mg/mL for bromelain after 24 and 48 h treatments, and 8.8 and 4.2 mg/mL for ficin after 24 and 48 h treatments, respectively. The apoptosis of the caco-2 cell line treated with bromelain was 81.04% and 56.70%, observed after 24 and 48 h. Total apoptotic proportions in caco-2 cells treated with ficin after 24 and 48 h were 83.7% and 73.0%. An amount of 1.6 mg/mL of bromelain and ficin treatments on caco-2 cells after 24 h revealed a higher decrease than that of other concentrations in the expression of ACE2 protein. Conclusions: In conclusion, bromelain and ficin can dose-dependently decrease the expression of ACE2 protein in caco-2 cells.

Molecular mechanisms of shigella pathogenesis : recent advances
Scientific paper ArODES

Babak Pakbin, Wolfram Manuel Brück, Thomas B. Brück

International Journal of Molecular Sciences,  24, 3, 2448

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Summary:

Shigella species are the main cause of bacillary diarrhoea or shigellosis in humans. These organisms are the inhabitants of the human intestinal tract; however, they are one of the main concerns in public health in both developed and developing countries. In this study, we reviewed and summarised the previous studies and recent advances in molecular mechanisms of pathogenesis of Shigella Dysenteriae and non-Dysenteriae species. Regarding the molecular mechanisms of pathogenesis and the presence of virulence factor encoding genes in Shigella strains, species of this bacteria are categorised into Dysenteriae and non-Dysenteriae clinical groups. Shigella species uses attachment, invasion, intracellular motility, toxin secretion and host cell interruption mechanisms, causing mild diarrhoea, haemorrhagic colitis and haemolytic uremic syndrome diseases in humans through the expression of effector delivery systems, protein effectors, toxins, host cell immune system evasion and iron uptake genes. The investigation of these genes and molecular mechanisms can help us to develop and design new methods to detect and differentiate these organisms in food and clinical samples and determine appropriate strategies to prevent and treat the intestinal and extraintestinal infections caused by these enteric pathogens.

Household food security and demographic factors in children and their parents
Scientific paper ArODES

Maryam Javadi, Babak Pakbin, Masomeh Ziaaeeha, Ameneh Barikani, Wolfram Manuel Brück

Journal of Nutrition and Food Security,  2023, 8, 1, 58-65

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Summary:

Food insecurity and hunger contribute to physical, psychological, and social effects. The relationship between food insecurity and negative consequences on health has been confirmed in multiple studies. The present study aims to identify food security and its association with some demographic factors in children and their parents. In this descriptive-analytical study, 1688 children aged 3-6 years were selected using cluster random sampling in 15 health centers in Qazvin, Iran. The results showed that 855 participants (50.7%) had food security, while 552 (32.7%) had food insecurity without hunger, 242 (14.4%) had food insecurity with slight hunger, and 37 (2.2%) had food insecurity with severe hunger. A significant correlation was observed between parental education level and food security (P < 0.001). Also, there was a significant correlation between the children’s body mass index (BMI) and food security (P < 0.005). No significant difference was observed between BMI, mother weight before delivery, and children’s sleeping and wake-up time in both groups. However, the birth rank (P < 0.01) and number of family (P < 0.02) in the secured group was significantly higher. The age of complementary feeding in the secured group was significantly higher (P < 0.06). Given that there is an association between birth weight, breastfeeding, parents’ education, and occupation with food security, it seems that pregnancy status and breastfeeding should be much more studied.

2022

Prevalence of foodborne and zoonotic viral pathogens in raw cow milk samples
Scientific paper ArODES

Babak Pakbin, John W. A. Rossen, Wolfram Manuel Brück, Naim Montazeri, Samaneh Allahyari, Shaghayegh Pishkhan Dibazar, Razieh Abdolvahabi, Razzagh Mahmoudi, Amir Peymani, Rasoul Samimi

FEMS Microbiology Letters,  2022, vol. 369, no. 1

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Summary:

Foodborne and zoonotic viral pathogens are responsible for substantial morbidity and mortality worldwide. These viruses can be transmitted through foods such as dairy products to humans and cause several acute and chronic diseases. This study aimed to investigate the prevalence and profile of different foodborne and zoonotic viruses in raw cow milk samples. We collected 492 raw cow milk samples from local dairy markets in Qazvin, Iran. Then we evaluated the presence of hepatitis A virus, noroviruses, rotavirus, astrovirus, bovine leukaemia virus (BLV) and tick-borne encephalitis virus (TBEV) in samples using conventional and nested reverse transcription-polymerase chain reaction methods. We found that 34.95, 7.72, 25.81, 14.63, 66.86, 12.80 and 21.34% of raw milk samples were contaminated with norovirus GI, norovirus GII, hepatitis A virus, rotavirus, astrovirus, BLV and TBEV viruses, respectively. Interestingly, the samples collected from the city's south area revealed a higher prevalence of foodborne and zoonotic viruses. Astrovirus and its combination with norovirus GI were the most prevalent virus profiles. Also, the highest correlations were observed among the presence of rotavirus and hepatitis A viruses (0.36) and TBEV and norovirus GII (0.31). Considering the prevalence rate and virus profiles of different foodborne and zoonotic viruses in raw milk samples, hygiene practices and the pasteurization process are strongly suggested to be conducted throughout the cow milk production chain and in dairy industries to prevent infections with these pathogens.

Morganella morganii infection in hirudo medicinalis (Iran) : a case report
Scientific paper ArODES

Hooman Rahmati Holasoo, Iradj Ashrafi Tamai, Wolfram Manuel Brück, Babak Pakbin, Alireza Nasiri, Amirparsa Azizi

Veterinary Sciences,  2022, vol. 9, no. 10. article no. 562

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Summary:

Medicinal leeches (Hirudo medicinalis) are used in surgical and non-surgical manners. Morganella morganii is an opportunistic and zoonotic pathogenic bacterium causing serious clinical complications. In this study, we isolated, discovered and characterized M. morganii-infected H. medicinalis. We detected and identified M. morganii in all inflamed and swollen Hirudo medicinalis samples. The 16S rRNA sequence of the isolates confirmed all strains of M. morganii. All strains were sensitive to Ceftriaxone, Ceftiofur, Danofloxacin, Ciprofloxacin, Enrofloxacin, Oxytetracycline, and Meropenem and were resistant to Erythromycin, Amoxicillin, Ampicillin, Cefazolin, Colistin, Penicillin G, and Lincomycin. This pathogenic bacterium is a zoonotic pathogen, and monitoring the prevalence rate of this bacteria is strongly necessary for leeches used in human medical treatment and care. Finally, all infected leeches were treated successfully in this case report study.

Production of bovine collagen hydrolysate with antioxidant activity : optimized by response surface methodology
Scientific paper ArODES

Babak Pakbin, Samaneh Allahyari, Shaghayegh Pishkhan Dibazar, Wolfram Manuel Brück, Roghayeh Vahidi, Razzagh Mahmoudi, Ali Khanjari

Scientia Pharmaceutica,  2022, vol. 90, no. 4, article no. 62

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Summary:

Antioxidants are widely used in pharmaceutical industries. Gelatin is a byproduct of the meat industry and its hydrolysates showed several functionalities, such as antioxidant activity. The purpose of this study was to describe and optimize the enzymatic hydrolysis conditions including time, temperature, pH, and enzyme/substrate ratio (E/S) to produce protein hydrolysate with antioxidant functionality from bovine gelatin by RSM; the scavenging activity was evaluated using the DPPH method. The model observed was fitted with desirable adequacy and sufficiency. We found that the antioxidant activity increased significantly (p < 0.05) with the increase in pH value, E/S ratio, and time of enzymatic process; however, the temperature had no significant (p < 0.05) effect on the antioxidant activity of the hydrolysate. The optimum hydrolysis conditions were observed at a temperature of 35.3 °C, pH of 8.0, and E/S ratio at 2.5 after 2 h hydrolysis by trypsin enzyme. The results showed that the hydrolysate under these conditions, optimized by RSM, could be more effective on antioxidant activity. Regarding the antioxidant potential, gelatin hydrolysate can be used as an antioxidant supplement in pharmaceutical industries.

A quantitative prevalence of Escherichia coli O157 in different food samples using real-time qPCR method
Scientific paper ArODES

Babak Pakbin, Wolfram Manuel Brück, Thomas B. Brück, Samaneh Allahyari, Iradj Ashrafi Tamai

Food Science Nutrition,  2022, vol. 11, pp. 228-235

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Summary:

Escherichia coli serogroup O157 is the main causative agent of several intestinal and extra-intestinal foodborne diseases in humans through consumption of low-dose contaminated foods such as milk, beef, and vegetables. To date, studies regarding the quantitative prevalence of E. coli O157 in foods are so limited. Therefore, this study aimed to evaluate the quantitative prevalence rate of E. coli serogroup O157 in raw milk (n = 144), vegetable salad (n = 174), and minced beef samples (n = 108) using the real-time qPCR SYBR green melting curve method targeting the rfbA gene. First, we evaluated the method and found a sensitive and specific qPCR assay with 1 log of CFU/ml detection limit to detect E. coli O157 (Tm = 80.3 ± 0.1°C). About 2.77%, 10.18%, and 9.19% of raw milk, minced beef, and vegetable salad samples, respectively, were contaminated with E. coli O157. Minced beef and vegetable salad samples were significantly more contaminated than raw milk samples. Population average of E. coli O157 in raw milk, minced beef, and vegetable salad samples were 2.22 ± 0.57, 3.30 ± 0.40, and 1.65 ± 0.44 log CFU/ml or gr, respectively. Significantly higher levels of population of E. coli O157 were observed in minced beef samples. Minced beef can be regarded as the main food in the transmission of this foodborne pathogen. Routine quantitative rapid monitoring is strongly suggested to be carried out to prevent foodborne diseases caused by E. coli O157.

Antibiotic resistance and molecular characterization of cronobacter sakazakii strains isolated from powdered infant formula milk
Scientific paper ArODES

Babak Pakbin, Wolfram Manuel Brück, Samaneh Allahyari, John W. A. Rossen, Razzagh Mahmoudi

Foods,  2022, vol. 11, no. 8, article no. 1093

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Summary:

Background: Cronobacter sakazakii is a new emerging foodborne bacterial pathogen associated with severe lethal diseases such as meningitis, necrotizing enterocolitis, and septicemia in infants and neonates. Powdered infant formula milk (PIFM) has been recognized as one of the main transmission vehicles and contaminated sources of this pathogen. This study aimed to investigate the prevalence rate, genotypic and phenotypic antibiotic resistance profile, and clonal relatedness of C. sakazakii strains isolated from 364 PIFM samples collected from Tehran city, Iran. Methods: Culture-based methods, Kirby–Bauer disk diffusion antibiotic resistance testing, conventional Polymerase Chain Reaction (PCR), and Enterobacterial Repetitive Intergenic Consensus PCR (ERIC-PCR) assays were used in this study to detect and characterize the C. sakazakii isolates. Results: We isolated 25 C. sakazakii strains from PIFM samples (6.86%). The isolates were highly resistant to amoxicillin-clavulanic acid, amoxicillin, ampicillin, cefoxitin, cefepime, erythromycin, ceftriaxone, ciprofloxacin, and chloramphenicol and susceptible to gentamicin, tetracycline, norfloxacin, and azithromycin antibiotics. The blaCTX-M-1 gene was detected in 96% of the isolates. The isolates were categorized into eight distinct clonal types using the ERIC-PCR method, showing a high genetic diversity among the isolates. However, there was a significant correlation between the genotypic and phenotypic antibiotic resistance properties of the isolates. Conclusions: Novel microbial surveillance systems for detecting multi-drug-resistant C. sakazakii are required to control the contamination of this foodborne pathogen in infant foods.

Phylogenetic analysis and antibiotic resistance of Shigella sonnei isolates
Scientific paper ArODES

Babak Pakbin, Abdollah Didban, Wolfram Manuel Brück, Mehdi Alizadeh

FEMS Microbiology Letters,  2022, vol. 369, no. 1, article no. fnac042

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Summary:

Shigellosis is one of the most important gastric infections caused by different species of Shigella, and has been regarded as a serious threat to public health. Lineage/sublineage profile of Shigella sonnei is strongly associated with the antibiotic resistance and population structure of this pathogen. In this study, we determined the phylogeny and antibiotic resistance profiles of S. sonnei strains, isolated from 1246 stool and 580 food samples, using multiplex PCR–HRMA genotyping and Kirby–Bauer disk diffusion methods, respectively. A total of 64 S. sonnei strains were isolated (13 food and 51 clinical isolates). Multiplex PCR–HMR assay was able to differentiate the lineages II and III, and sublineages IIIb and IIIc strains successfully considering the definite melting curves and temperatures. Lineage I and sublineage IIIa strain were not isolated in this study. We also demonstrated that most of the S. sonnei strains isolated from both food and clinical samples clustered within the lineage III and sublineage IIIc. Resistance against trimethoprim-sulfamethoxazole, tetracycline, chloramphenicol, and streptomycin antibiotics were the most prevalent phenotypes among the S. sonnei lineage III and sublineage IIIc strains.

Prevalence, antibiotic resistance, toxin-typing and genotyping of clostridium perfringens in raw beef meats obtained from Qazvin City, Iran
Scientific paper ArODES

Samaneh Hassani, Babak Pakbin, Wolfram Manuel Brück, Razzagh Mahmoudi, Shaghayegh Mousavi

Antibiotics,  2022, vol. 11, no. 3, article no. 340

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Summary:

Background: Clostridium perfringens is one of the highest prevailing spore-forming foodborne pathogens, which is widely distributed and causes severe disease and outbreaks in humans and animals. Raw meat and poultry are the main vehicles of this pathogen. In this study, we investigated the prevalence, antibiotic resistance pattern, toxin-encoding genes and genetic diversity of C. perfringens isolates from raw whole and minced meat samples purchased from local markets in Qazvin city, Iran (the source of beef cattle production was also located in Qazvin city, Iran). Methods: We used conventional culture-based and Kirby–Bauer disk diffusion and conventional and arbitrary primer PCR methods. Results: A total of 18 C. perfringens strains were isolated from 133 raw meat samples (13.53%). Up to 44.4 and 55.5% of these isolates were detected in raw minced and whole meat samples, respectively. We found that 72.2, 66.6, 61.1, 37.8 and 33.3% of the C. perfringens isolates were resistant to ampicillin, tetracycline, amoxicillin, ciprofloxacin and chloramphenicol antibiotics, respectively. Multidrug resistance was found in 38% of the isolates. Among the four main toxin genes evaluated, the Cpa gene was detected in all isolates, and 61.1% of the isolates were mostly recognized as type A C. perfringens. High levels of genetic diversity were observed among the isolates, and they were classified into five distinct groups. Conclusions: The isolates from whole meat samples were more resistant to antibiotics. However, toxin genes were more detected in the isolates from minced meat samples. Our findings suggest that contamination of raw meat products with multidrug resistant C. perfringens could be regarded as one of the concerning pathogens in these products. Comprehensive monitoring of C. perfringens isolates is strongly recommended.

FTIR differentiation based on genomic DNA for species identification of Shigella isolates from stool samples
Scientific paper ArODES

Babak Pakbin, Leila Zolghadr, Shahnaz Rafiei, Wolfram Manuel Brück, Thomas B. Brück

Scientific Reports,  2022, vol. 12, no. 2780

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Summary:

Shigellosis is one of the major public health concerns in developing and low-income countries caused by four species of Shigella. There is an apparent need to develop rapid, cost-effective, sensitive and specific methods for differentiation of Shigella species to be used in outbreaks and health surveillance systems. We developed a sensitive and specific Fourier-transform infrared spectroscopy (FTIR) based method followed by principal component analysis (PCA) and hierarchical clustering analysis (HCA) assays to differentiate four species of Shigella isolates from stool samples. The FTIR based method was evaluated by differentiation of 91 Shigella species from each other in clinical samples using both gold standards (culture-based and agglutination methods) and developed FTIR assay; eventually, the sensitivity and specificity of the developed method were calculated. In summary, four distinct FTIR spectra associated with four species of Shigella were obtained with wide variations in three definite regions, including 1800–1550 cm−1, 1550–1100 cm−1, and 1100–800 cm−1 distinguish these species from each other. In this study, we found the FTIR method followed by PCA analysis with specificity, sensitivity, differentiation error and correct differentiation rate values of 100, 100, 0 and 100%, respectively, for identification and differentiation of all species of the Shigella in stool samples.

Development of high-resolution melting (HRM) assay to differentiate the species of Shigella isolates from stool and food samples
Scientific paper ArODES

Babak Pakbin, Afshin Akhondzadeh Basti, Ali Khanjari, Wolfram Manuel Brück, Leila Azimi, Abdollah Karimi

Scientific Reports,  2022, vol. 12, article no. 473

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Summary:

Shigella species, a group of intracellular foodborne pathogens, are the main causes of bacillary dysentery and shigellosis in humans worldwide. It is essential to determine the species of Shigella in outbreaks and food safety surveillance systems. The available immunological and molecular methods for identifying Shigella species are relatively complicated, expensive and time-consuming. High resolution melting (HRM) assay is a rapid, cost-effective, and easy to perform PCR-based method that has recently been used for the differentiation of bacterial species. In this study, we designed and developed a PCR-HRM assay targeting rrsA gene to distinguish four species of 49 Shigella isolates from clinical and food samples and evaluated the sensitivity and specificity of the assay. The assay demonstrated a good analytical sensitivity with 0.01–0.1 ng of input DNA template and an analytical specificity of 100% to differentiate the Shigella species. The PCR-HRM assay also was able to identify the species of all 49 Shigella isolates from clinical and food samples correctly. Consequently, this rapid and user-friendly method demonstrated good sensitivity and specificity to differentiate species of the Shigella isolates from naturally contaminated samples and has the potential to be implemented in public health and food safety surveillance systems.

2021

Genetic diversity and antibiotic resistance of Shigella spp. isolates from food products
Scientific paper ArODES

Babak Pakbin, Zahra Amani, Samaneh Allahyari, Shaghayegh Mousavi, Razzagh Mahmoudi, Wolfram Manuel Brück, Amir Peymani

Food Science Nutrition,  2021, vol. 9. no. 11

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Summary:

The emergence of multidrug-resistant Shigella is a significant threat to global public health. Limited studies have investigated the incidence, antimicrobial susceptibility, and genetic diversity of Shigella isolated from food products. Conventional culture-based, serologic, molecular, disk diffusion, PCR, and RAPD-PCR methods were used to determine the prevalence rate, phenotypic and genotypic antibiotic resistance profile, and genetic diversity of the Shigella isolates from food samples including vegetable salad, ground meat, and raw cow's milk (405 samples). The prevalence rate of Shigella in food samples was 4.44%. The incidence of S. sonnei (3.7%) was higher than that of S. flexneri (0.74%). S. dysenteriae and S. boydii were not detected in food samples examined. Also, no Shigella were recovered from raw cow's milk. This study showed that the Shigella isolates were resistant to sulfamethoxazole/trimethoprim (83.3%), amoxicillin (66.6%), streptomycin (66.6%), tetracycline (61.1%), ampicillin (50%), amoxicillin–clavulanic acid (50%), azithromycin (50%), and chloramphenicol (50%) and completely sensitive to cefoxitin, cefepime, amikacin, and gentamicin. All Shigella isolates were multidrug-resistant. We detected blaSHV resistance gene in all isolates; however, no isolate harbored blaTEM gene. RAPD-PCR categorized the Shigella isolates into five main clusters. The highest antibiotic resistance was observed in the isolates of cluster R4. The finding of this study also indicated an association between antimicrobial resistance profiles and genotyping properties of the isolates. Novel food monitoring systems, including surveillance of multidrug-resistant foodborne pathogens, especially in developing countries, are required to control the foodborne diseases.

RAPD and ERIC-PCR coupled with HRM for species identification of non-dysenteriae Shigella species; as a potential alternative method
Scientific paper ArODES

Babak Pakbin, Afshin Akhondzadeh Basti, Ali Kanjari, Leila Azimi, Wolfram Manuel Brück, Abdollah Karimi

BMC Research Notes,  2021, vol. 14, article no. 345

Link to the publication

Summary:

Species identification of Shigella isolates are so prominent for epidemiological studies and infection prevention strategies. We developed and evaluated RAPD and ERIC-PCR coupled with HRM for differentiation of non-dysenteriae Shigella species as potential alternative methods. After isolation of eighteen Shigella strains from faecal specimens collected from children under 2 years of age with diarrhea (n = 143), the species of the isolates were identified by slide agglutination assay. Also, species were identified using developed RAPD-PCR-HRM and ERIC-PCR-HRM techniques. Differentiation of the data sets was measured by principal component analysis as a dimension reduction method. Then, sensitivity and specificity of the methods were evaluated. We found RAPD-PCR-HRM method with high sensitivity and specificity (100 and 85% respectively) to identify non-dysenteriae Shigella species in clinical specimens. However, sensitivity and specificity of ERIC-PCR-HRM were evaluated 33 and 46% respectively and significantly lower than that of RAPD-PCR-HRM assay. Regardless of inherent poor reproducibility of DNA fingerprinting-based methods, RAPD-PCR-HRM assay can be considered as a potential alternative method to identify non-dysenteriae species of Shigella in clinical specimens. As we observed in the current study, HRM technique is more rapid, inexpensive, and sensitive than gel electrophoresis method to characterize PCR amplicons.

Oral abscess caused by chryseobacterium indologenes in ball python (Python regius) : a case report
Scientific paper ArODES

Iradj Ashrafi Tamai, Babak Pakbin, Zahra Ziafati Kafi, Wolfram Manuel Brück

Antibiotics,  2021, vol. 10, no. 6, article no. 686

Link to the publication

Summary:

Chryseobacterium indologenes is an opportunistic pathogen isolated from human infections and, rarely, from some aquatic animals. A 3-year-old male ball python (Python regius) was admitted to the veterinary clinic by a pet owner because of acute respiratory and swallowing failure. During physical examinations, oral secretions and abscesses were observed in the mouth cavity and throat of the animal. After microbiological analysis including isolation, identification, and 16s rRNA sequencing, C. indologenes was detected as the main cause of the oral abscess in this case. Phylogenetic relatedness analysis showed a close relationship between this isolate and other strains isolated from human infections. Antimicrobial susceptibility testing revealed that the isolate was multi-drug resistant. However, it was very sensitive to minocycline, ceftazidime, and tetracycline. The patient was treated by antibiotic therapy and completely recovered after two weeks. To the best of our knowledge, this is the first incidence of C. indologenes in an oral abscess in a ball python. As a result we would consider this organism as an opportunistic animal pathogen with zoonotic potentiality.

2020

Enzymatic modification of native chitin and conversion to specialty chemical products
Scientific paper ArODES

Nathanael D. Arnold, Wolfram Manuel Brück, Daniel Garbe, Thomas B. Brück

Marine Drugs,  2020, vol. 18(2) no. 93

Link to the publication

Summary:

Chitin is one of the most abundant biomolecules on earth, occurring in crustacean shells and cell walls of fungi. While the polysaccharide is threatening to pollute coastal ecosystems in the form of accumulating shell-waste, it has the potential to be converted into highly profitable derivatives with applications in medicine, biotechnology, and wastewater treatment, among others. Traditionally this is still mostly done by the employment of aggressive chemicals, yielding low quality while producing toxic by-products. In the last decades, the enzymatic conversion of chitin has been on the rise, albeit still not on the same level of cost-effectiveness compared to the traditional methods due to its multi-step character. Another severe drawback of the biotechnological approach is the highly ordered structure of chitin, which renders it nigh impossible for most glycosidic hydrolases to act upon. So far, only the Auxiliary Activity 10 family (AA10), including lytic polysaccharide monooxygenases (LPMOs), is known to hydrolyse native recalcitrant chitin, which spares the expensive first step of chemical or mechanical pre-treatment to enlarge the substrate surface. The main advantages of enzymatic conversion of chitin over conventional chemical methods are the biocompability and, more strikingly, the higher product specificity, product quality, and yield of the process. Products with a higher Mw due to no unspecific depolymerisation besides an exactly defined degree and pattern of acetylation can be yielded. This provides a new toolset of thousands of new chitin and chitosan derivatives, as the physio-chemical properties can be modified according to the desired application. This review aims to provide an overview of the biotechnological tools currently at hand, as well as challenges and crucial steps to achieve the long-term goal of enzymatic conversion of native chitin into specialty chemical products.

2019

Microalgae as healthy ingredients for functional foods
Book chapter ArODES

Maria Consuelo Pina-Perez, Wolfram Manuel Brück, Michael Beyrer, Thomas Brück

Dans Galanakis, Charis M., The role of alternative and innovative food ingredients and products in consumer wellness  (pp. 103-137). 2019,  London, UK : Elsevier/Academic Press

Link to the publication

Microalgae as healthy ingredients for functional foods
Book chapter ArODES

Maria Consuelo Pina-Pérez, Wolfram Manuel Brück, Thomas Brück, Michael Beyrer

Dans Galanakis, Charis M., The role of alternative and innovative food ingredients and products in consumer wellness  (35 p.). 2019,  [s.l.] : Elsevier

Link to the publication

Nutritional and additive uses of chitin and chitosan in the food industry
Book chapter ArODES

Carla Harkin, Norbert Mehlmer, Dirk V. Woortman, Thomas B. Brück, Wolfram Manuel Brück

Sustainable Agriculture Reviews  (44 p.). 2019,  Cham : Springer

Link to the publication

Summary:

Chitin is the first polysaccharide identified by man. Chitin and its numerous oligomeric and monomeric, acetylated or deacetylated derivates have many physiological functions and applications. Chitin is found in the cuticles of arthropods and is a major constituent of cell walls from fungal, yeast and algae, from where chitin can be extracted chemically, enzymatically or by fermentation. The principal sources of chitin and chitosan are actually crustacean shells. Worldwide, more than 13.000.000 tons of crustaceans are caught from marine habitats each year, thus generating huge amounts of food waste. The unique biodegradability, biorenewability, biocompatibility, physiological inertness and hydrophilicity of chitin and chitosan make them of high interest for research and industry. In this chapter, we review the use of chitin, chitosan and their oligomers and monomers as food additives. In particular, their use in the regulation of lipid digestion and hypocholesterolemia, their functioning as an antigastritic agent and prebiotic is highlighted. Literature shows that oligomerization and the degree of deacetylation influences the development of chitin/chitosan-based nutraceuticals. The absence of chitinases and chitosanases in the human gut renders those biopolymers resistant to even partial degradation. For food applications, they are used as emulsifying, fining, thickening and stabilizing agents, antioxidants, and low calories food mimetics.

2018

ChiBio : an integrated bio-refinery for processing chitin-rich bio-waste to specialty chemicals
Book chapter ArODES

Volker Sieber, Michael Hofer, Wolfram Manuel Brück, Daniel Garbe, Thomas Brück, Catherine A. Lynch

Dans Rampelotto, Pabulo H., Trincone, Antonio, Gand challenges in Biology and Biotechnology  (24 p.). 2018,  Cham : Springer

Link to the publication

Summary:

Chitin is the second most abundant biopolymer on earth, next to plant-derived celluloses. It can be found in fungi, insects, and crustacean shells. The processing of crustaceans (e.g., shrimps and crabs) in the EU alone results in more than 100,000 tons of shell waste each year. Chemically, chitin is distinguished from cellulose just by an additional acetamide function on many of its 1.4-β-linked hexose monomer units. In contrast to lignocellulosic biomass and despite its unique chemical features, conversion strategies for chitin-rich biomass to value-added products are at present basically limited to chitosan utilization, although chitin has a huge potential for bio-based materials as well as chemicals. Especially for European shell waste, the high sodium carbonate content makes its usage challenging. In addition current processing methods require harsh chemical conditions. Therefore, with “ChiBio” a bio-refinery concept was recently developed within an EU-funded project, combining a sustainable chitin demineralization process by microorganisms and an enzymatic degradation of the biopolymer into its basic building blocks, N-acetylglucosamine and glucosamine. For the demineralization step, natural microbial isolates as well as Serratia spp. and Lactobacillus spp. were used in fermentations, realizing a demineralization grade of 97%. Chitin-degrading enzymes from Serratia marcescens, Amantichitinus ursilacus, and Andreprevotia ripae were overexpressed and used as enzyme cocktails to degrade chitin with yields up to 95%. The resulting monomers could finally be used for the production of novel bio-based polymers and all biological by-products accumulating in this process chain, e.g., proteins and lipids could be used as feed for biogas production. Overall, ChiBio is about novel tools, novel processes, and novel product portfolios to create value out of chitin-rich bio-waste products.

2017

Isolation of proteolytic bacteria from mealworm (Tenebrio molitor) exoskeletons to produce chitinous material
Scientific paper ArODES

Fernanda Kerche Paes Da Silva, Dieter W. Brück, Wolfram Manuel Brück

FEMS Microbiology Letters,  2017, vol. 15, no. 364

Link to the publication

Summary:

The use of insects as a source of protein is becoming an important factor for feeding an increasing population. After protein extraction for food use, the insect exoskeleton may offer the possibility for the production of added value products. Here, the aim was to isolate bacteria from the surface of farmed mealworms (Tenebrio molitor Linnaeus, 1758) for the production of chitinous material from insect exoskeletons using microbial fermentation. Isolates were screened for proteases and acid production that may aid deproteination and demineralisation of insects through fermentation to produce chitin. Selected isolates were used single-step (isolated bacteria only) or two-step fermentations with Lactobacillus plantarum (DSM 20174). Two-step fermentations with isolates from mealworm exoskeletons resulted in a demineralisation of 97.9 and 98.5% from deproteinated mealworm fractions. Attenuated total reflectance-Fourier- transform infrared spectroscopy analysis showed that crude chitin was produced. However, further optimisation is needed before the process can be upscaled. This is, to our knowledge, the first report using microbial fermentation for the extraction of chitin from insects.

The benefits of alpha-lactalbumin in early childhood
Scientific paper ArODES

Wolfram Manuel Brück

Dairy in human health and disease across the lifespan,  2017, pp. 117-126

Link to the publication

Summary:

Breast milk provides optimal species-specific nutrition for the growing animal. Consequently, bovine milk–based nutrition for infants is incapable of providing a balanced nutritional profile without considerable adaptation. Human milk, e.g., has a larger proportion of alpha-lactalbumin (28%) than bovine milk (3%) or whey-dominant formula where β-lactoglobin is predominant. Enriching cow’s milk–based infant formula with bovine alpha-lactalbumin has considerable benefits for child development. Due to high concentrations for essential amino acids, supplementation enables a lowering of the total protein content of formula to resemble the protein profile of human milk (12.8 g/L). This, in turn, normalizes blood urea nitrogen concentration and greater weight-for-length ratios profiles, lowering the risk of obesity in later life. Beyond its nutritional aspects, alpha-lactalbumin has also been shown to have several other beneficial effects on child development: Clinical trials and in vitro studies have shown that alpha-lactalbumin may aid mineral binding, induce apoptosis and tumor suppression, modulate the immune system, and effect the microbiology of the infant human gut by promoting bifidobacteria and inhibiting the growth of potential pathogens.

2016

Recovery of chitinous material from brown crab (cancer pagurus) shell waste using fermentation and chemical methods
Scientific paper ArODES

Catherine A. Lynch, Carla Harkin, Denis McCrudden, Dieter W. Brück, Johannes Lindorfer, Wolfram Manuel Brück

Journal of Chitin and Chitosan Science,  2016, vol. 4, no. 1, pp. 59-68

Link to the publication

Summary:

Chitinous material was extracted from brown crab (Cancer pagarus) shell waste using traditional chemical methods as well as microbial fermentation for life cycle analysis (LCA) and to compare differences in recovery levels and quality. Chemical extraction used 1 mol l–1 hydrochloric acid for demineralization and 1 mol l–1 sodium hydroxide for deproteination. Microbial fermentation was optimized for microorganisms used, glucose concentration and fermentation times for each process. Crab shell waste was deproteinated with Serratia marscescens (DSM 30121), followed by demineralisation using Lactobacillus plantarum (DSM 20174). Extraction by either method resulted in pink flakes white to light brown fragments of chitinous material with a similar energy demands and costs. Products were characterized using the following variables: moisture, ash, nitrogen/protein, water and fat binding capacities, Fourier transformed infrared spectroscopy (FTIR) and mineral composition. The proposed method provides a viable alternative to chemical treatments for the extraction and recovery of chitinous materials.

2015

Rate of establishing the gut microbiota in infancy has consequences for future health
Scientific paper ArODES

Shaillay Dogra, Olga Sakwinska, Shu-E Soh, Catherine Ngom-Bru, Wolfram Manuel Brück, Bernard Berger, Harald Brüssow, Neerja Karnani, Yung Seng Lee, Keith M. Godfrey

Gut Microbes,  2015, vol. 6, no. 5

Link to the publication

Summary:

The gut of the human neonate is colonized rapidly after birth from an early sparse and highly distinct microbiota to a more adult-like and convergent state, within 1 to 3 years. The progression of colonizing bacterial species is non-random. During the first months of life several shifts commonly occur in the species prevalent in our guts. Although the sequential progression of these species is remarkably consistent across individuals and geographies, there is inter-individual variation in the rate of progression. Our study and others suggest that the rate is influenced by environmental factors, and influences our future health. In this article, we review our recent contribution to cataloging the developing infant gut microbiota alongside other important recent studies. We suggest testable hypotheses that arise from this synthesis.

In vitro activity of commercial probiotic Lactobacillus strains against uropathogenic Escherichia coli
Scientific paper ArODES

Michèle Delley, Anne Bruttin, Michel Richard, Michael Affolter, Enea Rezzonico, Wolfram Manuel Brück

FEMS Microbiology Letters,  2015, vol. 362, no. 13, article no. fnv096

Link to the publication

Summary:

Urinary tract infection (UTI) is one of the most prevalent infections in humans. In ≥80% of cases, the etiologic agents are strains of uropathogenic Escherichia coli (UPEC), which commonly reside in the gastrointestinal tract. Lactobacilli have been shown to prevent UTI reoccurrence by restoring the urogenital microbiota when administered vaginally or orally. The goal of this study was to determine if commercial probiotic Lactobacillus spp. reduce or clear UPEC in vitro. Results show that it is likely that lactobacilli may, in addition to restoring a healthy urogenital microbiota through acidification of their environment, also displace adhering UPEC and cause a reduction of infection.

Von der Krebsschale in die Creme
Scientific paper ArODES

Wolfram Manuel Brück, Felix Bracharz, Dieter W. Brück, Thomas B. Brück

Biologie in unserer Zeit,  2015, no. 45, pp. 160-167

Link to the publication

Summary:

Chitin ist eines der am häufigsten vorkommenden Biopolymere der Erde. Große Mengen dieses Rohstoffes können aus Schalenresten der Fischerei-Industrie gewonnen werden. Allerdings sind die etablierten chemischen Technologien mit hohen Umweltbelastungen verbunden. Die mikrobiologische Fermentation und der Einsatz von Enzymen zur Gewinnung des Polymers haben sich als wertvolle Alternative erwiesen, bei der gleichzeitig auch andere Wertstoffe gewonnen werden können. Allerdings ist durch die Vielfalt der benutzten Organismen und Bedingungen und die daraus folgenden unterschiedlichen Ausbeuten schwer zu beurteilen, welche Methode sich am besten zur industriellen Produktion eignet. Chitin und seine Derivate zeigen jedoch großes Potenzial als Antioxidantien, Antimikrobiotika und Bindemittel und finden bereits in der Lebensmitteltechnik, der Medizin, in der Landwirtschaft und in Konsumgütern Verwendung. Um die Innovation auf diesem Gebiet voranzutreiben, ist ein interdisziplinärer Ansatz aus Biologie und Chemie erforderlich.

A duplex qPCR for the simultaneous detection of Escherichia coli O157:H7 and Listeria monocytogenes using LNA probes
Scientific paper ArODES

S. S. Nitecki, N. Teape, B. F. Carney, J. W. Slater, Wolfram Manuel Brück

Letters in Applied Microbiology,  2015, vol. 61, pp. 20-27

Link to the publication

Summary:

In this study, a duplex qPCR assay was developed for the needs of the Irish fish industry to screen for the two major food-borne pathogens of fish, Listeria monocytogenes and Escherichia coli O157:H7. The assay can claim positive or negative results for two pathogens in one go in only 20 h including 16 h universal pre-enrichment and compared to traditional ISO approved plate culture methods the labour and the cost involved in testing of one sample is reduced to minimum. The highly specific genomic areas targeted for PCR amplification in the assay are the hly gene for listeriolysin O (LLO) of L. monocytogenes and the stx gene for Shiga–like toxin expressed by E. coli O157:H7. The detection limit of the assay is consistent with the consumer protection limits of 1 pg genomic DNA or 1 CFU 25 g−1 fish meat (with enrichment) allowing the test to be considered as a substitute to standard plate culture methods.

Dynamics of infant gut microbiota are influenced by delivery mode and gestational duration and are associated with subsequent adiposity
Scientific paper ArODES

Shaillay Dogra, Olga Sakwinska, Shu-E Soh, Catherine Ngom-Bru, Wolfram Manuel Brück, Bernard Berger, Harald Brüssow, Yung Seng Lee, Fabian Yap, Yap-Seng Chong, Keith M. Godfrey, Joanna D. Holbrook

mBio,  2015, vol. 6, no. 1, article no. e02419-14

Link to the publication

Summary:

We found that the relatively simple microbiota of young infants shifts predictably to a more mature anaerobic microbiota during infancy and the dynamics of this shift are influenced by environmental factors. In this longitudinal study of 75 infants, we demonstrate high interindividual variability within the normal range of birth outcomes, especially in the rate of microbiota progression. Most had acquired a microbiota profile high in Bifidobacterium and Collinsella by 6 months of age, but the time point of this acquisition was later in infants delivered by caesarean section and those born after a shorter duration of gestation. Independently of the delivery mode and gestation duration, infants who acquired a profile high in Bifidobacterium and Collinsella at a later age had lower adiposity at 18 months of age. This study shows that the acquisition of the early microbiota is strongly influenced by environmental factors such as the delivery mode and duration of gestation, even in healthy neonates. The composition of the early microbiota has been linked with long-lasting effects on health and disease. Here we show that the rate of acquisition of certain microbiota predicts adiposity at 18 months of age and so potentially the risk of later obesity.

Isolation & identification of bacteria for the treatment of brown crab (Cancer pagurus ) waste to produce chitinous material
Scientific paper ArODES

C. Harkin, Wolfram Manuel Brück, C. Lynch

Journal of Applied Microbiology,  2015, vol. 118, no. 4, pp. 954-965

Link to the publication

Summary:

To isolate bacteria from soil for microbial pretreatment of brown crab (Cancer pagurus) shell waste and the production of chitin. Isolates were screened for protease enzymes and acid production in order to facilitate the removal of protein and calcium carbonate fractions from brown crab shell to yield a chitinous material. Selected isolates were applied in various combinations in successive, two-step fermentations with brown crab shell waste. These isolates were identified as: Exiguobacterium spp. (GenBank accession number: KP050496), Bacillus cereus (GenBank accession number: KP050499), B. subtilis (GenBank accession number: KP050498), Bacillus licheniformis (GenBank accession number: KP050497), Pseudomonas migulae (GenBank accession number: KP050501), Pseudomonas spp. (GenBank accession number: KP050500), Pseudomonas spp. (GenBank accession number: KP050502), Arthrobacter luteolus (GenBank accession number: KP050503), Lactobacillus spp. (GenBank accession number: KP072000) and Enterococcus spp. (GenBank accession number: KP071999). Successive two-step fermentations with isolates in certain combinations resulted in a demineralization of >94% and the extraction of a crude chitin fraction from brown crab processing waste. The highest demineralization, 98·9% was achieved when isolates identified as B. cereus and Pseudomonas spp. were used in combination. The transfer of fermentations to a larger scale requires further research for optimization. The successful application of these isolates in successive two-step fermentation of brown crab shell waste to extract chitin means with further research into optimization and scale up, this chitin extraction process may be applied on an industrial scale and provide further commercial value from brown crab shell waste.

2014

The effect of proteolysis on the induction of cell death by monomeric alpha-lactalbumin
Scientific paper ArODES

Wolfram Manuel Brück, Glenn R. Gibson, Thomas B. Brück

Biochimie,  2014, vol. 97, pp. 138-143

Link to the publication

Summary:

α-Lactalbumin (α-la) is a major whey protein found in milk. Previous data suggested that α-la has antiproliferative effects in human adenocarcinoma cell lines such as Caco-2 and HT-29. However, the cell death inducing α-la was not a naturally occurring monomer but either a multimeric variant or an α-la:oleic acid complex (HAMLET/BAMLET). Proteolysis showed that both human and bovine α-la are susceptible to digestion. ELISA assays assessing cell death with the native undigested α-la fractions showed that undigested protein fractions did have a significant cell death effect on CaCo-2 cells. Bovine α-la was also more effective than human α-la. A reduction in activity corresponded with lower concentrations of the protein and partial digestion and fragmentation of the protein using trypsin and pepsin. This suggests that the tertiary structure is vital for the apoptotic effect.

2024

The effect of supplemented formula on the infant gut microbiota using in vitro fermentation
Conference ArODES

Wolfram Manuel Brück, Klaudyna Borewicz

Proceedings of the European Congress on Biotechnology, 30 June - 3 July 2024, Rotterdam, The Netherlands

Link to the conference

Biostimulanzien als ökologische Alternativen gegen abiotischen Stress : Entwicklung eines Algen-Hochdurchsatzmodelles
Conference ArODES

Wolfram Manuel Brück, Wilfried Andlauer

Proceedings of the D-A-CH Algen Summit 2024, 7-8 Mai 2024, Bern, Switzerland

Link to the conference

Surface and hand disinfection using atmospheric plasma sources
Conference ArODES

Wolfram Manuel Brück, Alain Savary, Martine Baudin, Martine Emery Mabillard, Gilles Courret

Proceedings of the 7th Global Public Health Conference (GLOBEHEAL 2024), 22-23 February 2024, Bangkok, Thailand

Link to the conference

2023

Spread of multidrug resistant escherichia coli and klebsiella pneumoniae in long-term healthcare units' environment
Conference ArODES

Camila Teixeira, Catarina Santos-Marques, Josman Dantas Palmeiras, Wolfram Manuel Brück, Douglas Teodoro, Sónia Gonçalves Pereira

Proceeedings of the 10th Congress of European Microbiologists, 9-13 July 2023, Hamburg, Germany

Link to the conference

Air microbial quality in healthcare units and its role as pool for pathogens and multidrug resistance
Conference ArODES

Catarina Santos-Marques, Camila Teixeira, Wolfram Manuel Brück, Sónia Gonçalves Pereira

Proceeedings of the 10th Congress of European Microbiologists, 9-13 July 2023, Hamburg, Germany

Link to the conference

The effect of supplemented formula on the infant gut microbiota using an in vitro fermentation
Conference ArODES

Wolfram Manuel Brück

Proceedings of the International Scientific Conference Probiotics, Prebiotics Gut Microbiota and Health, 20-22 June 2023, Bratislava, Slovakia

Link to the conference

Potential prebiotic activity of insect flour and insect protein isolates using an in vitro gut microbiota model
Conference ArODES

Wolfram Manuel Brück, Tugce Cansev

Proceedings of the International Scientific Conference Probiotics, Prebiotics Gut Microbiota and Health, 20-22 June 2023, Bratislava, Slovakia

Link to the conference

2022

Fast prototyping for atmospheric plasma sources integration into air hand dryers
Conference ArODES

Abdel Majid Kassir, Joël Sonnard, Ludovic Roulin, Martine Baudin, Gilles Courret, Wolfram Manuel Brück

Proceedings of the irc 2022, XVI international research conference

Link to the conference

Summary:

Motivated by the current COVID-19 pandemic and the need to find alternative methods to contain and battle it, the purpose of this innovative project is to conceive a disinfection module equipped with a cold atmospheric plasma source. Such a plasma source was developed for a potential integration into pulsed air hand dryers. This type of plasma is known for its ability to generate reactive oxygen and nitrogen species that initiate bio-molecular reactions involved in bacterial and viral deactivation mechanisms. This study shows how additive manufacturing helped accelerate the prototyping of a nozzle allowing the preservation of the plasma flow from circulation cells and external interferences in the discharge’s surrounding.

2021

The influence of dietary insects on the human gut microbiota
Conference ArODES

Remy Tenud, Martine Emery Mabillard, Alexandre Kuhn, Wolfram Manuel Brück

Proceedings of the 12th International Symposium on Gut Microbiology, 13-15 October 2021, virtual venue

Link to the conference

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