食品科学 ›› 2019, Vol. 40 ›› Issue (13): 171-176.doi: 10.7506/spkx1002-6630-20180709-129

• 营养卫生 • 上一篇    下一篇

肉牛屠宰过程中分离出沙门氏菌的脉冲场凝胶电泳分子溯源分析

董鹏程,张一敏,毛衍伟,梁荣蓉,韩广星,朱立贤,罗 欣   

  1. 1.山东农业大学食品科学与工程学院,山东 泰安 270000;2.国家肉牛牦牛产业技术体系临沂站,山东 临沂 276000
  • 出版日期:2019-07-15 发布日期:2019-07-23
  • 基金资助:
    山东省自然科学基金博士基金项目(ZR2017BC064);现代农业产业技术体系建设专项(CARS-37);山东省现代农业产业技术体系——牛产业创新团队项目(SDAIT-09-09)

Molecular Typing of Salmonella Species Isolated from Beef Abattoirs by Pulsed-Field Gel Electrophoresis Analysis

DONG Pengcheng, ZHANG Yimin, MAO Yanwei, LIANG Rongrong, HAN Guangxing, ZHU Lixian, LUO Xin   

  1. 1. College of Food Science and Engineering, Shandong Agricultural University, Tai’an 270000, China; 2. National Beef Cattle Industrial Technology System, Linyi Station, Linyi 276000, China
  • Online:2019-07-15 Published:2019-07-23

摘要: 为确定沙门氏菌在肉牛屠宰过程中不同工序间传播路径与交叉污染情况,应用脉冲场凝胶电泳(pulsedfield gel electrophoresis,PFGE)技术对分离于肉牛屠宰过程6 个工序点(粪便、皮毛、去皮后、喷淋后、排酸后、分割肉)的沙门氏菌进行分子溯源分析。结果证实,PFGE比血清分型具有更高的分辨率,48 株沙门氏菌的PFGE图谱相似度为48.0%~100.0%,所有菌株在95.7%的相似度下划分为22 个基因型,不同工厂(地域)间未发现高度相似的基因型。宰前动物的皮毛和粪便间存在严重的交叉污染现象,部分来源于粪便、皮毛的沙门氏菌已经突破屠宰企业的防控屏障,对胴体(洁净区)造成了污染,具有进一步污染下游产品的可能性。因此,应加强宰前管理,减少宰前交叉污染对企业内部防控措施造成的压力,并对去皮后的胴体设置喷淋减菌的干预程序,以有效扼制沙门氏菌由动物胃肠道向屠宰线的传播。

关键词: 沙门氏菌, 脉冲场凝胶电泳, 溯源分析, 肉牛屠宰

Abstract: In order to investigate and specify the transmission and cross-contamination of Salmonella during bovine slaughtering, the source of strains isolated from six different processing points (hides, pre-evisceration carcasses, postevisceration, post-washing carcasses, chilled carcasses, meat and feces) was traced at the molecular level by pulsed-field gel electrophoresis (PFGE). The data showed a better insight into the distribution of Salmonella than serotyping. The similarity of 48 PFGE patterns ranged from 48.0% to 100.0% and 22 different profiles were identified from all these isolates at a similarity level of 95.7%. No highly similar pattern was found among different abattoirs. Serious and widespread crosscontamination from live animals’ hides and feces to carcasses was verified. Slaughtering plants should pay more attention to pre-slaughter management strategies to avoid cross-contamination problems and spraying intervention in dehided carcasses should be included as an extra critical control point to reduce the risk of Salmonella infection.

Key words: Salmonella, pulsed-field gel electrophoresis, source tracing analysis, beef cattle slaughtering

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