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Inactivation of a diverse set of shiga toxin-producing Escherichia coli in ground beef by high pressure processing

机译：通过高压处理灭活绞碎牛肉中多种产生志贺毒素的大肠杆菌

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摘要

Shiga toxin-producing Escherichia coli (STEC) are regularly implicated in foodborne illness outbreaks and recalls of ground beef. In this study we determined the High Pressure Processing (HPP) D_(10) value (the processing conditions needed to reduce the microbial population by 1 log) of 39 STEC isolates, including the "big six" serovars, O104 and O157:H7. STEC isolates included those isolated from animals and environmental sources in addition to those associated with illness in humans. Individual STEC were inoculated into 80% lean ground beef and treated with HPP (350 MPa, 4 ℃, up to 40 min). The mean D_(10) was 9.74 min, with a range of 0.89-25.70 min. The D_(10) of the STEC involved in human illness was 9.25 vs. 10.40 min for those not involved in human illness (p ＞ 0.05). The presence or absence of genes encoding virulence factors (e.g. Shiga toxin 1 or 2, intimin, or enterohemolysin) had no effect on the HPP D_(10) (p ＞ 0.05). The high D_(10) of some STEC involved in human illness should be considered in selecting HPP processing parameters for ground beef. This study demonstrates the heterogeneity of STEC resistance to HPP. Risk assessors and the food industry can use this information to provide safer meat products to consumers.
机译：产生志贺毒素的大肠杆菌（STEC）通常与食源性疾病暴发和绞碎牛肉的召回有关。在这项研究中，我们确定了39种STEC分离株的高压加工（HPP）D_（10）值（使微生物种群减少1 log所需的加工条件），包括“六大”血清型O104和O157：H7。 STEC分离株包括与动物和环境来源分离的分离株，以及与人类疾病相关的分离株。将单个STEC接种到80％的瘦牛肉中，并用HPP（350 MPa，4℃，长达40分钟）处理。平均D_（10）为9.74分钟，范围为0.89-25.70分钟。与人类疾病无关的STEC的D_（10）为9.25，而与人类疾病无关的STEC的D_（10）为10.40分钟（p＞ 0.05）。编码毒力因子的基因的存在与否（例如志贺毒素1或2，内膜蛋白或肠溶血素）对HPP D_（10）没有影响（p＞ 0.05）。选择碎牛肉的HPP加工参数时，应考虑某些与人类疾病有关的STEC的高D_（10）。这项研究证明了STEC对HPP的抗性异质性。风险评估人员和食品行业可以使用此信息为消费者提供更安全的肉类产品。

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  • 来源
    《Food microbiology》 |2015年第12期|84-87|共4页
  • 作者

    Shiowshuh Sheen; Jennifer Cassidy; Butch Scullen; Christopher Sommers;

  • 作者单位

    Eastern Regional Research Center, Agricultural Research Service, U.S. Department of Agriculture, Wyndmoor, PA 19038, USA;

    Eastern Regional Research Center, Agricultural Research Service, U.S. Department of Agriculture, Wyndmoor, PA 19038, USA;

    Eastern Regional Research Center, Agricultural Research Service, U.S. Department of Agriculture, Wyndmoor, PA 19038, USA;

    Eastern Regional Research Center, Agricultural Research Service, U.S. Department of Agriculture, Wyndmoor, PA 19038, USA;

  • 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 processing; Ground beef; Shiga toxin-producing E. coli; Virulence factors; Surrogates;

    机译：高压处理;碎牛肉;产生志贺毒素的大肠杆菌;毒力因素;代孕;

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