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首页> 外文期刊>Food microbiology >Efficacy of post-harvest rinsing and bleach disinfection of E. coli O157:H7 on spinach leaf surfaces
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Efficacy of post-harvest rinsing and bleach disinfection of E. coli O157:H7 on spinach leaf surfaces

机译：菠菜叶表面大肠杆菌O157：H7的收获后漂洗和漂白消毒的功效

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摘要

Attachment and detachment kinetics of Escherichia coli O157:H7 from baby spinach leaf epicuticle layers were investigated using a parallel plate flow chamber. Mass transfer rate coefficients were used to determine the impact of water chemistry and common bleach disinfection rinses on the removal and inactivation of the pathogen. Attachment mass transfer rate coefficients generally increased with ionic strength. Detachment mass transfer rate coefficients were nearly the same in KCl and AGW rinses; however, the detachment phase lasted longer in KCl than AGW (18 ± 4 min and 4 ± 2 min, respectively), indicating that the ions present during attachment play a significant role in the cells' ability to remain attached. Specifically, increasing bleach rinse concentration by two orders of magnitude was found to increase the detachment mass transfer rate coefficient by 20 times (from 5.7 ± 0.7 × 10~(-11) m/s to 112.1 ± 26.8 × 10~(-11) m/s for 10 ppb and 1000 ppb, respectively), and up to 88 ± 4% of attached cells remained alive. The spinach leaf texture was incorporated within a COMSOL model of disinfectant concentration gradients, which revealed nearly 15% of the leaf surface is exposed to almost 1000 times lower concentration than the bulk rinse solution.
机译：使用平行板流动室研究大肠杆菌O157：H7从菠菜叶片表皮层的附着和分离动力学。传质速率系数用于确定水化学和普通漂白剂消毒漂洗液对病原体去除和灭活的影响。附着物的传质速率系数通常随离子强度而增加。在KCl和AGW冲洗液中，分离传质速率系数几乎相同。然而，脱离阶段在KCl中的持续时间比AGW更长（分别为18±4分钟和4±2分钟），这表明附着过程中存在的离子在细胞保持附着能力中起着重要作用。具体而言，发现将漂白漂洗液的浓度增加两个数量级会使分离传质速率系数增加20倍（从5.7±0.7×10〜（-11）m / s增至112.1±26.8×10〜（-11） m / s分别为10 ppb和1000 ppb），并且高达88±4％的附着细胞仍然存活。菠菜叶片的质地被纳入消毒剂浓度梯度的COMSOL模型中，该模型显示将近15％的叶片表面暴露于浓度比散装冲洗溶液低近1000倍。

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  • 来源
    《Food microbiology》 |2017年第4期|212-220|共9页
  • 作者

    Nichola M. Kinsinger; Holly M. Mayton; Madeline R. Luth; Sharon L. Walker;

  • 作者单位

    Department of Chemical and Environmental Engineering, University of California, Riverside, CA, 92521, United States;

    Department of Chemical and Environmental Engineering, University of California, Riverside, CA, 92521, United States;

    Department of Chemical and Environmental Engineering, University of California, Riverside, CA, 92521, United States;

    Department of Chemical and Environmental Engineering, University of California, Riverside, CA, 92521, United States;

  • 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

    Escherichia coli O157:H7; Foodborne pathogens; Bacterial attachment; Disinfection; Produce; Spinach;

    机译：大肠杆菌O157：H7;食源性病原体;细菌附着;消毒;生产;菠菜;

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