By measuring growth ability and capacities of acid production, extracellular polysaccharide, and urea decomposition, a strain QLMCC19 with high fermentation performance was screened from 20 strains of Streptococcus thermophilus isolated from traditional Xinjiang yogurt. This strain grows fast and has an acid production capacity of 85. 40 °T. It was testified to be a good strain with the following advantages: has capacity to use galactose,has high urease activity andhigh ability to produce exopolysaccharides.%通过对分离自新疆地区传统酸奶的20株嗜热链球菌的生长能力和产酸能力、产胞外多糖能力、尿素分解能力等指标的测定,筛选出一株具有较高发酵性能的嗜热链球菌菌株QLMCC19.该菌株生长速度快,产酸能力为85. 40 °T,且实验发现其具有利用半乳糖能力,脲酶活性高,产胞外多糖能力高,是一株优良菌株.
展开▼
