Screening and studying the strains of weak postacidification in yoghurt
In this paper,the typical yogurt starter strains:Lactobacillus delbrueckii subsp.Bulgaricus and Streptococcus thermophilus were experimental materials.The characteristics of acid producing of single strain and mixing according to different ratio were determined.Results indicated that two trains with weak postacidification were obtained.When the mixing ratio of the two strains was 100:1,its acidity rose only 10 °T after 24 h at 42 ℃.Compared to YF-L822 starter culture from Hansen Corporation,it produced a little postacidification.