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首页> 外文期刊>Food microbiology >Inactivation dynamics of Salmonella enterica, Listeria monocytogenes, and Escherichia coli O157:H7 in wash water during simulated chlorine depletion and replenishment processes
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Inactivation dynamics of Salmonella enterica, Listeria monocytogenes, and Escherichia coli O157:H7 in wash water during simulated chlorine depletion and replenishment processes

机译：模拟氯耗竭和补给过程中洗水中沙门氏菌，单核细胞增生性李斯特菌和大肠杆菌O157：H7的灭活动力学

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摘要

Maintaining effective sanitizer concentration is of critical importance for preventing pathogen survival and transference during fresh-cut produce wash operation and for ensuring the safety of finished products. However, maintaining an adequate level of sanitizer in wash water can be challenging for processors due to the large organic load in the wash system. In this study, we investigated how the survival of human pathogens was affected by the dynamic changes in water quality during chlorine depletion and replenishment in simulated produce washing operations. Lettuce extract was added incrementally into water containing pre-set levels of free chlorine to simulate the chlorine depletion process, and sodium hypochlorite was added incrementally into water containing pre-set levels of lettuce extract to simulate chlorine replenishment. Key water quality parameters were closely monitored and the bactericidal activity of the wash water was evaluated using three-strain cocktails of Escherichia coli O157:H7, Salmonella enterica, and Listeria monocytogenes. In both chlorine depletion and replenishment processes, no pathogen survival was observed when wash water free chlorine level was maintained above 3.66 mg/L, irrespective of the initial free chlorine levels (10, 50, 100 and 200 mg/L) or organic loading (chemical oxidation demand levels of 0, 532, 1013 and 1705 mg/L). At this free chlorine concentration, the measured ORP was 843 mV and pH was 5.12 for the chlorine depletion process; the measured ORP was 714 mV and pH was 6.97 for the chlorine replenishment process. This study provides quantitative data needed by the fresh-cut produce industry and the regulatory agencies to establish critical operational control parameters to prevent pathogen survival and cross-contamination during fresh produce washing.
机译：维持有效的消毒剂浓度对于防止病原体在鲜切农产品洗涤操作中的存活和转移以及确保成品的安全至关重要。但是，由于清洗系统中有机物的负荷很大，因此在清洗水中保持足够水平的消毒剂可能对加工人员构成挑战。在这项研究中，我们调查了模拟农产品洗涤操作中氯耗竭和补充过程中水质的动态变化如何影响人类病原体的生存。将生菜提取物逐渐添加到含有预设水平的游离氯的水中，以模拟氯的消耗过程；将次氯酸钠逐渐添加到含有生菜提取物的预设水平中的水，以模拟氯的补充。严密监控关键水质参数，并使用大肠杆菌O157：H7，肠炎沙门氏菌和单核细胞增生李斯特菌的三株混合物对洗涤水的杀菌活性进行评估。在氯的消耗和补给过程中，无论初始游离氯水平（10、50、100和200 mg / L）还是有机负荷（冲洗水），当洗涤水中的游离氯水平保持在3.66 mg / L以上时，都没有观察到病原体存活。化学氧化需求水平为0、532、1013和1705 mg / L）。在该游离氯浓度下，对于氯耗竭过程，测得的ORP为843 mV，pH为5.12。在氯气补充过程中，测得的ORP为714 mV，pH为6.97。这项研究提供了鲜切农产品行业和监管机构建立关键操作控制参数所需的定量数据，以防止病原体存活和鲜农产品洗涤过程中的交叉污染。

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  • 来源
    《Food microbiology》 |2015年第9期|88-96|共9页
  • 作者

    Bin Zhou; Yaguang Luo; Xiangwu Nou; Shuxia Lyu; Qin Wang;

  • 作者单位

    U. S. Department of Agriculture, Agricultural Research Service, Beltsville Agricultural Research Center, Environmental Microbiology and Food Safety Laboratory, 10300 Baltimore Ave, Beltsville, MD 20705, USA,Department of Nutrition and Food Science, University of Maryland, 0112 Skinner Building, College Park, MD 20742, USA;

    U. S. Department of Agriculture, Agricultural Research Service, Beltsville Agricultural Research Center, Environmental Microbiology and Food Safety Laboratory, 10300 Baltimore Ave, Beltsville, MD 20705, USA;

    U. S. Department of Agriculture, Agricultural Research Service, Beltsville Agricultural Research Center, Environmental Microbiology and Food Safety Laboratory, 10300 Baltimore Ave, Beltsville, MD 20705, USA;

    College of Biological Sciences and Technology, Shenyang Agricultural University, Shenyang, PR China;

    Department of Nutrition and Food Science, University of Maryland, 0112 Skinner Building, College Park, MD 20742, 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

    Wash water; Organic load; Human pathogen; Chlorine depletion; Chlorine replenishment;

    机译：洗净水;有机负荷;人类病原体氯耗竭;氯补充;

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