Short communication, Note
Effect of Casein Hydrolysates on Yogurt Fermentation and Texture Properties during Storage
Qiang-Zhong Zhao
; College of Light Industry and Food Science, South China University of Technology, Guangzhou 510640, PR China
Jin-Shui Wang
; College of Light Industry and Food Science, South China University of Technology, Guangzhou 510640, PR China
Mou-Ming Zhao
; College of Light Industry and Food Science, South China University of Technology, Guangzhou 510640, PR China
Yue-Ming Jiang
Cui Chun
; College of Light Industry and Food Science, South China University of Technology, Guangzhou 510640, PR China
Abstract
Effects of casein hydrolysates by papain on acidification of the yogurts and growth of probiotic bacteria during yogurt fermentation have been investigated. The viability of probiotic bacteria and texture characteristics of the yogurts during storage at 4 °C have been evaluated. The hydrolysates strongly decreased the fermentation and coagulation time of the yogurts. 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 yogurts except for 0.5 % of hydrolysate with degree of hydrolysis of 8.5 %. The sensory evaluation scores of the yogurts 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.
Keywords
yogurt; casein hydrolysates; acidification; viability; texture properties; sensory evaluation
Hrčak ID:
109970
URI
Publication date:
15.9.2006.
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