食品科学

• 分析检测 • 上一篇    下一篇

荧光标记法测定菌落总数

张永帅,孙俊良*,梁新红,李元召   

  1. 河南科技学院食品学院,河南 新乡 453003
  • 出版日期:2014-10-25 发布日期:2014-11-07
  • 基金资助:

    国家自然科学基金面上项目(311641/C200101);河南省科技计划项目(122102110037)

Determination of Total Number of Colonies by Fluorescence Labeling Method

ZHANG Yong-shuai, SUN Jun-liang*, LIANG Xin-hong, LI Yuan-zhao   

  1. School of Food Science, Henan Institute of Science and Technology, Xinxiang 453003, China
  • Online:2014-10-25 Published:2014-11-07

摘要:

采用一种新型破膜剂麝香草酚将微生物细胞壁完全破裂,再用碘化丙啶荧光标记微生物核酸或DNA,测定荧光值。建立工作曲线,根据荧光值在工作曲线上查出菌落总数。结果表明,破膜剂麝香草酚的最适浓度为4 mmol/L,本方法测定枯草芽孢杆菌菌落数对应荧光值的相对标准偏差为1.29%,回收率为98.4%。方法准确可
靠,而且不需要大量铺平板,简便快速。

关键词: 荧光标记, 菌落总数, 麝香草酚

Abstract:

After complete disruption of the microbial cell wall with thymol, the nucleic acids or DNAs were labeled with
propidium iodide for the detection of fluorescence values. A standard curve was established for extrapolating total number
of colonies based on the fluorescence values. The results showed that the optimal thymol concentration for breaking the
microbial cell wall was 4 mmol/L. The relative standard deviation of this method for the determination of the fluorescence of
B. subtilis colonies was 1.29%, and the recovery rate was 98.4%. This method is accurate, reliable, simple and rapid without
the use of a large amount of plates.

Key words: fluorescence labeling, the total number of colonies, thymol

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