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Published on: May 4, 2018
Effects of glycinin basic peptide on physicochemical characteristics and microbial inactivation of pasteurized milk
Guo-Ping Zhao1, Ying-Qiu Li1, Gui-Jin Sun1
1School of Food Science & Engineering, Qilu University of Technology, No. 3501 University Road of Changqing District, 250353, Jinan, Shandong Province, China.
Abstract:
The effects of glycinin basic peptide (GBP) on physicochemical characteristics and microbial inactivation of pasteurized milk were investigated over 21d of storage at 4°C. Sensory properties, total bacterial count, pH, alcohol levels, lactose content, and protein changes of pasteurized milk differentially treated with GBP were analyzed periodically during refrigerated storage. Compared with the control, reductions for total bacterial count and specific bacterium (Staphylococcus aureus) in pasteurized milk treated with GBP during storage were found. However, sensory scores, pH, lactose, and protein contents of pasteurized milk treated with GBP were much higher than those of the control. A concentration of 0.015% (wt/vol) GBP could effectively inhibit the growth and reproduction of bacteria in pasteurized milk, enhance its sensory and physicochemical properties, and extend its shelf life to 15d. Thus, GBP has good potential to be a natural milk preservative.
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