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Isolation and Identification of Lactic Acid Bacteria from Dzo Yogurt in Gannan Pasture Area of China

MA Yuxiao, LI Wei, CHEN Xiaohong, JIANG Mei, RUI Xin, DONG Mingsheng   

  1. College of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095, China
  • Online:2015-02-15 Published:2015-02-10

Abstract:

A total of 76 strains of lactic acid bacteria (LAB) were isolated from home-made dzo yogurt samples collected
from Gannan pasture region of Gansu province in China. Through fermentation tests, three strains of LAB including
1 strain of cocci and 2 strain of bacillus were screened. By analysis of their 16S rRNA gene sequences, the three strains
were identified to be Enterococcus faecium, Lactobacillus delbrueckii and Lactobacillus fermentum, respectively. Mixed
culture fermentation by cocci and bacillus at a ratio of 1:1 showed that faster acidification, lower post-acidification and better
sensory property than the individual fermentation.

Key words: dzo yogurt, lactic acid bacteria, isolation, fermentation performance

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