Effect of casein hydrolysates on yogurt fermentation and texture properties during storage.

摘要

Effects of casein hydrolysates by papain on acidification of the yoghurts and growth of probiotic bacteria during yoghurt fermentation have been investigated. The viability of probiotic bacteria and texture characteristics of the yogurts during storage at 4 degrees C have been evaluated. The hydrolysates strongly decreased the fermentation and coagulation time of the yoghurts. The post-fermentation acidification was retarded by the hydrolysates. The hydrolysates increased the probiotic counts during initial fermentation stage. The growth of the probiotic organisms decreased at the final stage. Survival of probiotic bacteria was improved by the hydrolysates. The hydrolysates significantly (p<0.05) increased the adhesiveness of the yoghurts except for 0.5% of hydrolysate with degree of hydrolysis of 8.5%. The sensory evaluation scores of the yoghurts were significantly (p<0.05) improved by the hydrolysates after the storage. The effect of casein hydrolysates on fermentation and texture properties was related to the molecular mass of the hydrolysates..