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Influence of cyclopropane fatty acids on heat, high pressure, acid, and oxidative stress resistance in Escherichia coli
Download2016-01-01
Chen, Yuan Yao, Gänzle, Michael G.
Heat and high pressure resistant strains of Escherichia coli are a challenge to food safety. This study investigated effects of cyclopropane fatty acids (CFAs) on stress tolerance in the heat- and pressure-resistant strain E. coli AW1.7 and the sensitive strain E. coli MG1655. The role of CFAs...
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Influence of water activity on the heat resistance of Salmonella enterica in selected low-moisture foods
Download2020-12-01
Guatam, Bina, Govindan, Byju N., Gänzle, Michael G., Roopesh, M.S.
Low-moisture foods (LMF with water activity, aw < 0.85) including pet foods and black pepper powder have consistently been associated with foodborne disease caused by Salmonella enterica. Increased heat resistance and prolonged survival at low-moisture conditions, however, remain major challenges...
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Lactic metabolism revisited: metabolism of lactic acid bacteria in food fermentations and food spoilage
Download2015-01-01
Sensory properties, shelf life, and safety of a majority of fermented foods are determined by the metabolic activity of food fermenting lactic acid bacteria. This communication reviews major metabolic routes of lactic acid bacteria, and indicates how metabolism is influenced by the environmental...
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2017-04-01
Chen, Xiao Yan, Gänzle, Michael G.
Valorization of lactose is achieved by enzymatic conversion to lactose derivatives with nutraceutical properties. This review summarizes recent developments on composition and functional properties of lactose-derived oligosaccharides. Lactose conversion by β-galactosidase yields...
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LC‐MS/MS quantitation of α‐amylase/trypsin inhibitor CM3 and glutathione during wheat sourdough breadmaking
Download2022-07-01
Won, Savanna, Curtis, Jonathan, Gänzle, Michael G.
Aims This study aimed to quantify α‐amylase/trypsin inhibitor (ATI) CM3 and glutathione (GSH) during wheat sourdough breadmaking. Methods and results Breads were made with two wheat cultivars and fermented with Fructilactobacillus sanfranciscensis, F. sanfranciscensis ΔgshR or Latilactobacillus...
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Lethality of high-pressure carbon dioxide on Shiga toxin-producing Escherichia coli, Salmonella and surrogate organisms on beef jerky
Download2020-05-16
Schultze, Danielle M., Couto, Ricardo, Temelli, Feral, McMullen, Lynn M., Gänzle, Michael G.
Low water activity (aW) foods permit the survival of low-infectious dose pathogens including Escherichia coli and Salmonella. Desiccation of non-heat resistant E. coli and Salmonella enterica increases their heat resistance; therefore, alternative methods are necessary to ensure the safety of low...
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Lifestyles of sourdough lactobacilli – Do they matter for microbial ecology and bread quality?
Download2018-01-01
Gänzle, Michael G., Zheng, Jinshui
Sourdough is used in production of (steamed) bread as leavening agent (type I sourdoughs) or as baking improver to enhance flavour, texture, and shelf life of bread (type II sourdoughs). The long-term propagation of sourdoughs eliminates dispersal limitation and consistently leads to sourdough...
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2019-01-01
Ripari, Valery, Bai, Yunpeng, Gänzle, Michael G.
This work aimed to study the phenolic acid metabolism of sourdough lactic acid bacteria (LAB) in laboratory media, and in sourdough fermentation with single cultures and in co-fermentations. Lactobacilli were selected from isolates obtained from 35 sourdough samples. Isolates (114 strains) were...
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Novel two-component regulatory systems play a role in biofilm formation of Lactobacillus reuteri rodent isolate 100-23
Download2014-01-01
Su, Marcia Shu-Wei, Gänzle, Michael G.
his study characterized the two-component regulatory systems encoded by bfrKRT and cemAKR, and assessed their influence on biofilm formation by Lactobacillus reuteri 100-23. A method for deletion of multiple genes was employed to disrupt the genetic loci of two-component systems. The operons...
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Prebiotics, FODMAPs and dietary fiber - conflicting concepts in development of functional food products?
Download2018-01-01
Yan, Ya Lu, Hu, Ying, Gänzle, Michael G.
The term prebiotic relates to beneficial modulation of intestinal microbiota by dietary carbohydrates, however, uncertainties of the differentiation of the term 'prebiotics' from dietary fiber as well as FODMAPs impede development of functional foods containing prebiotics. This communication...