食品科学
• 分析检测 • 上一篇 下一篇
张永帅,孙俊良*,梁新红,李元召
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国家自然科学基金面上项目(311641/C200101);河南省科技计划项目(122102110037)
ZHANG Yong-shuai, SUN Jun-liang*, LIANG Xin-hong, LI Yuan-zhao
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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
中图分类号:
TS235.9
张永帅,孙俊良*,梁新红,李元召. 荧光标记法测定菌落总数[J]. 食品科学, doi: 10.7506/spkx1002-6630-201420026.
ZHANG Yong-shuai, SUN Jun-liang*, LIANG Xin-hong, LI Yuan-zhao. Determination of Total Number of Colonies by Fluorescence Labeling Method[J]. FOOD SCIENCE, doi: 10.7506/spkx1002-6630-201420026.
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链接本文: https://www.spkx.net.cn/CN/10.7506/spkx1002-6630-201420026
https://www.spkx.net.cn/CN/Y2014/V35/I20/131