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Salmonella inactivation and cross-contamination on cherry and grape tomatoes under simulated wash conditions

机译：在模拟洗涤条件下樱桃和葡萄番茄的沙门氏菌失活和交叉污染

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摘要

Washing in chlorinated water is widely practiced for commercial fresh produce processing. While known as an effective tool for mitigating food safety risks, chlorine washing could also represent an opportunity for spreading microbial contaminations under sub-optimal operating conditions. This study evaluated Salmonella inactivation and cross-contamination in a simulated washing process of cherry and grape tomatoes. Commercially harvested tomatoes and the associated inedible plant matter (debris) were differentially inoculated with kanamycin resistant (KanR) or rifampin resistant (RifR) Salmonella strains, and washed together with uninoculated tomatoes in simulated packinghouse dump tank (flume) wash water. Washing in chlorinated water resulted in significantly higher Salmonella reduction on tomatoes than on debris, achieving 2-3 log reduction on tomatoes and about 1 log reduction on debris. Cross-contamination by Salmonella on tomatoes was significantly reduced in the presence of 25-150 mg/L free chlorine, although sporadic cross-contamination on tomatoes was detected when tomatoes and debris were inoculated at high population density. The majority of the sporadic cross-contaminations originated from Salmonella inoculated on debris. These findings suggested that debris could be a potentially significant source of contamination during commercial tomato washing.
机译：在商业新鲜产品加工中，广泛使用氯化水洗涤。尽管氯洗涤被认为是减轻食品安全风险的有效工具，但它也可能是在次优操作条件下传播微生物污染的机会。这项研究评估了樱桃和葡萄番茄的模拟洗涤过程中沙门氏菌的失活和交叉污染。用卡那霉素抗性（KanR）或利福平抗性（RifR）沙门氏菌菌株对商品化收获的西红柿和相关的不可食用植物物质（碎片）进行差异接种，并在模拟包装车间垃圾箱（水槽）洗涤水中与未接种的西红柿一起洗涤。用氯化水洗涤后，番茄沙门氏菌的减少量要比残渣高得多，番茄的沙门氏菌减少了2-3个对数，残渣的沙门氏菌减少了约1个对数。在存在25-150 mg / L游离氯的情况下，沙门氏菌对番茄的交叉污染显着降低，尽管当以高人口密度接种番茄和碎屑时会检测到番茄的零星交叉污染。大多数零星的交叉污染源自接种在碎片上的沙门氏菌。这些发现表明，残渣可能是商业番茄清洗过程中潜在的重要污染源。

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  • 来源
    《Food microbiology》 |2020年第5期|103359.1-103359.8|共8页
  • 作者

    Samantha Bolten; Ganyu Gu; Yaguang Luo; Sam Van Haute; Bin Zhou; Pat Millner; Shirley A. Micallef; Xiangwu Nou;

  • 作者单位

    Environmental Microbial and Food Safety Laboratory USDA ARS Beltsville MD 20705 USA Department of Plant Science and Landscape Architecture University of Maryland College Park MD 20742 USA;

    Environmental Microbial and Food Safety Laboratory USDA ARS Beltsville MD 20705 USA Eastern Shore Agricultural Research and Extension Center Virginia Tech Painter VA 23420 USA;

    Environmental Microbial and Food Safety Laboratory USDA ARS Beltsville MD 20705 USA;

    Department of Plant Science and Landscape Architecture University of Maryland College Park MD 20742 USA Centre for Food Safety and Security Systems University of Maryland 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

    Salmonella; Tomatoes; Debris; Wash water; Chlorine; Cross-contamination;

    机译：沙门氏菌;番茄;碎屑;洗净水;氯;交叉感染;

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