食品科学 ›› 2008, Vol. 29 ›› Issue (2): 292-296.

• 分析检测 • 上一篇    下一篇

实时RT-PCR检测存活于乳中的单核细胞增多性李斯特菌

 闫冰, 姜毓君, 曲妍妍, 毕宇涵, 相丽, 赵凤   

  1. 乳品科学教育部重点实验室 东北农业大学食品学院; 乳品科学教育部重点实验室; 东北农业大学食品学院; 黑龙江哈尔滨150030;
  • 出版日期:2008-02-15 发布日期:2011-08-24

Detection of Viable Listeria monocytogenes in Milk by Real Time RT-PCR

 YAN  Bing, JIANG  Yu-Jun, QU  Yan-Yan, BI  Yu-Han, XIANG  Li, ZHAO  Feng   

  1. Key Laboratory of Dairy Science, Ministry of Education, College of Food Science and Engineering, Northeast Agricultural University, Harbin 150030, China
  • Online:2008-02-15 Published:2011-08-24

摘要: 单增李斯特菌是一种可在低温下生长、能引起人畜共患病的食源性致病菌。为克服传统PCR检测的假阳性问题,有效的检测单增李斯特活菌,本研究提取单增李斯特菌的总RNA并进行反转录,以单增李斯特菌的必要毒力基因hlyA为靶基因,设计特异性引物和TaqMan探针进行实时PCR检测,研究了检测的特异性和灵敏度,考查了对人工污染牛乳进行检测的应用性。结果表明,所用引物和探针能较好的扩增目的基因,而对其他食源性致病菌无交叉反应。单增李斯特菌经1h增菌,可检出3×102CFU/ml。而经3h增菌,活菌检测限可达30CFU/ml。人工污染牛乳样品经6h增菌,检测限为17CFU/ml。此方法可应用于乳中单增李斯特菌的快速检测和污染状况调查。

关键词: 实时RT-PCR, 单增李斯特菌, hlyA, 人工污染乳, 活菌

Abstract: Listeria monocytogenes is a kind of food-borne pathogenic bacterium strain grown at low temperature and can cause zoonosis. The method is based on real time reverse-transcription-PCR (RT-PCR) amplification of mRNA to detect viable Listeria monocytogenes by specific hlyA gene. This method can overcome the false-positive caused by amplification of nonviable Listeria monocytogenes in the detection process. Both sensitivity and specification of this method were studied, and the artificially contaminated milk by Listeria monocytogenes was assayed. The results showed that the specific primers and probe do not cross-react with other food-borne pathogens. The sensitivity of detection Listeria monocytogenes is 3×102 CFU/ml after being cultivated 1 h and 30 CFU/ml after 3 h. The sensitivity of detection of artificially contaminated milk is 17 CFU/ml after being cultivated 6 h. So this method can satisfy the demandion of diagnosis and detection of Listeria monocytogenes.

Key words:  , real time RT-PCR; Listeria monocytogenes; hlyA; artificially contaminated milk; viable bacterium;