食品科学

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实时荧光定量PCR技术监测腌制麻竹笋中乳酸乳球菌动态变化

夏雪娟1,郑 炯1,2,*,叶秀娟1,吴金松1,阚建全1,2   

  1. 1.西南大学食品科学学院,重庆 400715;2.重庆市特色食品工程技术研究中心,重庆 400715
  • 出版日期:2016-02-25 发布日期:2016-02-23
  • 通讯作者: 郑 炯
  • 基金资助:

    中央高校基本科研业务费专项(XDJK2013C131);重庆市特色食品工程技术研究中心能力提升项目(cstc2014pt-gc8001)

Detection of Lactococcus lactis in Pickled Ma Bamboo Shoots by Quantitative Real-time PCR

XIA Xuejuan1, ZHENG Jiong1,2,*, YE Xiujuan1, WU Jinsong1, KAN Jianquan1,2   

  1. 1. College of Food Science, Southwest University, Chongqing 400715, China;
    2. Chongqing Engineering Research Center of Regional Food, Chongqing 400715, China
  • Online:2016-02-25 Published:2016-02-23
  • Contact: ZHENG Jiong

摘要:

采用实时荧光定量聚合酶链式反应(quantitative real-time polymerase chain reaction,qRT-PCR)技术定量监测6 g/100 mL盐质量浓度腌制麻竹笋中乳酸乳球菌(Lactococcus lactis)的动态变化。经乳酸乳球菌标准菌株基因组DNA提取、标准阳性质粒制备、标准曲线绘制、各时期竹笋腌制发酵液中细菌基因组DNA提取和乳酸乳球菌qRTPCR特异性扩增,对腌制液中乳酸乳球菌进行定量检测。结果表明,在腌制过程中(0~63 d),随着腌制时间的延长,乳酸乳球菌含量逐渐升高,在腌制14 d时达到最大值(4.63×108 copies/μL),与0 d(2.41×102 copies/μL)相比增加了6 个数量级,而后浓度缓慢降低,在腌制63 d时浓度为5.02×106 copies/μL。qRT-PCR技术为定量监测腌制麻竹笋中微生物的动态变化提供了一条可靠、快速的有效途径。

关键词: 大叶麻竹笋, 腌制, 实时荧光定量PCR, 乳酸乳球菌, 动态变化

Abstract:

The dynamic changes of Lactococcus lactis in pickled Ma bamboo shoots with 6 g/100 mL salt concentration were
studied by quantitative real-time polymerase chain reaction (qRT-PCR). After the DNA extraction from standard Lactococcus
lactis, preparation of positive plasmids, protraction of standard curve, DNA extraction from samples at different fermentation
stages and qRT-PCR, and quantitative detection were performed. The results showed that during fermentation (0–63 days),
the concentration of Lactococcus lactis increased gradually from 2.41 × 102 copies/μL (day 0) to the maximum value of
4.63 × 108 copies/μL (day 14), an increase by six orders of magnitude, followed by a slow decrease to 5.02 × 106 copies/μL
at day 63. In conclusion, qRT-PCR technology provides a reliable, fast and effective way for the quantitative analysis of
bacteria in pickled Ma bamboo shoots.

Key words: Ma bamboo shoots (Dendrocalamus latiflorus), pickling, quantitative real-time polymerase chain reaction (qRT-PCR), Lactococcus lactis, dynamic changes

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