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The evaluation of gamma irradiation and cold storage for the reduction of Campylobacter jejuni in chicken livers

机译：γ辐照和冷藏对减少鸡肝空肠弯曲菌的评估

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摘要

Recent outbreaks of Campylobacter mediated disease attributed to undercooked chicken livers have highlighted a continuing need for methods to reduce Campylobacter numbers in these types of food products. In this study, gamma irradiation is evaluated for its effectiveness in reducing Campylobacter jejuni numbers in experimentally contaminated chicken livers. A wide range of radiation doses were evaluated in conjunction with cold storage parameters, before and after irradiation. Storage of chicken livers at -20 degrees C prior to radiation treatment, as expected, increased C. jejuni radiation resistance. Livers previously stored at -20 degrees C exhibited D-10 values of 0.748 kiloGray (kGy) compared to livers without previous storage that had a significantly lower D-10 value of 0.361 kGy. Cold storage conditions post-irradiation at both 4 degrees C and -20 degrees C further reduced the C. jejuni numbers over those reduced by the initial irradiation. The largest reduction (3.8 logs) of C. jejuni numbers in livers produced by combining irradiation and cold storage was achieved using 0.8 kGy of radiation followed by 1 week storage at -20 degrees C. This reduction of 3.8 logs was not determined to be significantly different from the 3.5 log reduction achieved with the same radiation dose (0.8 kGy) after only 48 h of subsequent storage at -20 degrees C.
机译：最近由于未煮熟的鸡肝引起的弯曲杆菌介导的疾病暴发，突出表明了对减少这些类型食品中弯曲杆菌数量的方法的持续需求。在这项研究中，评估了γ射线在减少实验污染鸡肝中空肠弯曲杆菌数量方面的有效性。在辐照之前和之后，结合冷藏参数评估了各种辐照剂量。如预期的那样，在放射治疗之前将鸡肝储存在-20摄氏度下，会提高空肠弯曲杆菌的抗辐射能力。与未事先储存的肝脏相比，先前储存在-20摄氏度的肝脏的D-10值为0.748 kGy（kGy），而肝脏的D-10则明显较低，为0.361 kGy。与在初始辐照下降低的空肠弯曲菌数相比，在4摄氏度和-20摄氏度辐照后的冷藏条件进一步降低了空肠弯曲杆菌数。通过使用0.8 kGy辐射，然后在-20摄氏度下储存1周，可以实现辐射与冷藏结合产生的空肠弯曲杆菌数量的最大减少（3.8个对数）。与在相同的辐射剂量（0.8 kGy）下于-20摄氏度下仅存储48小时后达到的3.5 log降低不同。

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  • 来源
    《Food microbiology》 |2019年第9期|249-253|共5页
  • 作者

    Gunther Nereus W.; Abdul-Wakeel Aisha; Scullen O. Joseph; Sommers Christopher;

  • 作者单位

    ARS, USDA, Eastern Reg Res Ctr, Mol Characterizat Foodborne Pathogens Res Unit, Wyndmoor, PA 19038 USA;

    ARS, USDA, Eastern Reg Res Ctr, Mol Characterizat Foodborne Pathogens Res Unit, Wyndmoor, PA 19038 USA;

    ARS, USDA, Eastern Reg Res Ctr, Food Safety & Intervent Technol, Wyndmoor, PA 19038 USA;

    ARS, USDA, Eastern Reg Res Ctr, Food Safety & Intervent Technol, 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

    Campylobacter; Chicken livers; Irradiation;

    机译：弯曲杆菌;鸡肝;辐照;

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