Screening the good set-style yogurt combined starter culture

To screen starter cultures for set-style yogurt production,the fermentation characteristics of 23 lactic acid bacteria strains(13 streptococci and 10 lactobacilli) were studied.By comparing the stability,activity and curd time of the 23 strains,13 strains(7 streptococci and 6 lactobacilli) were screened out preliminary.According to the bacteria prepotent compensate principle,different strains were combined each other,and combined strains were evaluated according to the characteristics of fermented milk such as lactic acid productivity,texture profile analysis,quantity of whey and the acidification of the fermented milk during storage etc.The best combination strains were S1,S4 and L2.This combination produces acid quickly at the beginning of fermentation and has little whey,good flavor which has the potential to be used as the direct vet starter.