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Effect of the food matrix on pressure resistance of Shiga-toxin producing Escherichia coli

机译：食物基质对产志贺毒素大肠杆菌的抗压性的影响

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摘要

The pressure resistance of Shiga-toxin producing Escherichia coli (STEC) depends on food matrix. This study compared the resistance of two five-strain E. coli cocktails, as well as the pressure resistant strain E. coli AW1.7, to hydrostatic pressure application in bruschetta, tzatziki, yoghurt and ground beef at 600 MPa, 20 ℃ for 3 min and during post-pressure survival at 4 ℃. Pressure reduced STEC in plant and dairy products by more than 5 logs (cfu/ml) but not in ground beef. The pH affected the resistance of STEC to pressure as well as the post-pressure survival. E. coli with food constituents including calcium, magnesium, glutamate, caffeic acid and acetic acid were treated at 600 MPa, 20 ℃. All compounds exhibited a protective effect on E. coli. The antimicrobial compounds ethanol and phenylethanol enhanced the inactivation by pressure. Calcium and magnesium also performed protective effects on £. coli during storage. Glutamate, glutamine or glutathione did not significantly influence the post-pressure survival over 12 days. Preliminary investigation on cell membrane was further performed through the use of fluorescence probe 1-N-phenylnaphthylamine. Pressure effectively permeabilised cell membrane, whereas calcium showed no effects on membrane permeabilisation.
机译：产生志贺毒素的大肠杆菌（STEC）的耐压性取决于食物基质。这项研究比较了两种五株大肠杆菌鸡尾酒以及耐压菌株大肠杆菌AW1.7在600 MPa，20℃，3℃下对意式烤面包，tzatziki，酸奶和碎牛肉施加静水压力的抵抗力3分钟和在4℃的压力后存活期间。压力使植物和乳制品中的STEC降低了5 log（cfu / ml）以上，但碎牛肉中没有。 pH值影响STEC的耐压性以及后压寿命。含有钙，镁，谷氨酸，咖啡酸和乙酸等食物成分的大肠杆菌在600 MPa和20℃下处理。所有化合物均对大肠杆菌表现出保护作用。抗菌化合物乙醇和苯乙醇通过压力增强了灭活作用。钙和镁也对£具有保护作用。储存期间的大肠杆菌。谷氨酸，谷氨酰胺或谷胱甘肽对压力持续超过12天的存活率没有显着影响。通过使用荧光探针1-N-苯基萘胺进一步对细胞膜进行了初步研究。压力有效地渗透了细胞膜，而钙对膜通透性没有影响。

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  • 来源
    《Food microbiology》 |2016年第8期|96-102|共7页
  • 作者

    Hui Li; Rigoberto Garcia-Hernandez; Darcy Driedger; Lynn M. McMullen; Michael Gaenzle;

  • 作者单位

    University of Alberta, Department of Agricultural, Food and Nutritional Science, Edmonton, Canada;

    University of Alberta, Department of Agricultural, Food and Nutritional Science, Edmonton, Canada;

    Alberta Agriculture and Forestry, Food Processing Development Centre, Leduc, Canada;

    University of Alberta, Department of Agricultural, Food and Nutritional Science, Edmonton, Canada;

    University of Alberta, Dept. of Agricultural, Food and Nutritional Science, 4-10 Ag/For Centre Edmonton, AB T6G 2P5, Canada,Hubei University of Technology, School of Food and Pharmaceutical Engineering, Wuhan, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    High pressure; Escherichia coli; Shiga-toxin producing £ coli (STEC); Food matrix; Membrane;

    机译：高压力;大肠杆菌;产生志贺毒素的大肠杆菌（STEC）;食物基质;膜;

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