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  • 标题:Real-Time PCRを用いた牛乳および生乳中の Salmonella 増殖の特性評価と増殖挙動のモデル化
  • 本地全文:下载
  • 作者:川崎 晋 ; 清水 茂雅 ; 小関 成樹
  • 期刊名称:日本食品微生物学会雑誌
  • 印刷版ISSN:1340-8267
  • 电子版ISSN:1882-5982
  • 出版年度:2014
  • 卷号:31
  • 期号:1
  • 页码:28-35
  • DOI:10.5803/jsfm.31.28
  • 出版社:Japanese Society of Food Microbiology
  • 摘要:

    The Salmonella growth was monitored in pasteurized and non- pasteurized milk using real-time PCR, and growth prediction model was constructed based on the results. Pasteurized and non- pasteurized milk were inoculated with Salmonella to a concentration of 104 CFU/m l , and the Salmonella growth was monitored for 168 hours at 4℃ to 35℃ using traditional culture method and real-time PCR. With real-time PCR, total-DNA was directly extracted from 1 m l of pasteurized and non- pasteurized milk, and the copy number of Salmonella invA was quantified and converted to the Salmonella cell count. The Salmonella cell counts estimated by traditional culture method and real-time PCR in pasteurized milk were very similar, and these results were reflecting the MRV predictive model. A predictive growth curve was constructed from the Salmonella cell count estimated using real-time PCR, and a relational expression for the maximum growth rate (μmax) and incubation temperature was derived using the square-root model. Comparison of μmax between pasteurized and non-pasteurized milk showed a slightly lower μmax of Salmonella for non- pasteurized milk compared to pasteurized milk, and the maximum cell concentration also tended to be lower for non- pasteurized milk. Application of the real-time PCR monitoring and predictive microbiological analysis enables rapid provision of a growth prediction formula that includes the effects of microbacterial flora and food matrices.

  • 关键词:quantitative PCR; Salmonella ; predictive growth model; non-pasteurized milk
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