China Dairy ›› 2023, Vol. 0 ›› Issue (1): 64-69.doi: 10.12377/1671-4393.23.01.12

• QUALITY CONTROL • Previous Articles     Next Articles

Study on Changes of Escherichia coli in Yogurt and Milk Beverages

MA Jing1, LUO Min1, SONG Yanmei1, TAN Lianying1, FAN Guangcai1, ZHOU Huan1, QIAN Chenglin1, XIA Zhongyue1,2,*   

  1. 1New Hope Dairy Co.,Ltd.,Chengdu Sichuan 610023;
    2Dairy Nutrition and Function,Key Laboratory of Sichuan Province,Chengdu Sichuan 610023
  • Published:2023-02-15

Abstract: Changes and impact factors of Escherichia coli infection in yogurt and milk beverages were explored during the actual production process. Escherichia coli was measured regularly during storage,while it was inoculated in yogurt,milk beverages and culture media with different temperature and pH. The content of Escherichia coli in yogurt and milk beverages with different pH (4.2 and 3.6) which stored at different storage temperature (4 ℃ and 25 ℃) was reduced over time.Compared with the product stored at 4 °C,the bacterial content of the product stored at 25 °C decreased faster.Similarly,when the pH of the product was 3.6,the rate of decrease in bacterial content was higher than that of the product with pH 4.2.The Escherichia coli was cultured with different pH media,and when the pH was less than 3.8,the activity of it was inhibited.This study provided theoretical basis and guidance for the inspection of Escherichia coli and product quality control under the conditions of refrigeration and de-cooling during actual production and processing.

Key words: Escherichia coli(E. coli), yogurt, milk beverage, stored temperature, pH

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