Inhibition of hydrolysates from silver carp Hypophthalmichthys molitrix head on the angiotensin converting enzyme(ACE)
XU Qing-ling1, ZENG Qing-zhu2,ZHAO Hui1, CUI Tie-jun1,XING Dian-lou1
1. School of Life Science and Technology, Dalian Fisheries Univ., Dalian 116023, 2. Department of Food Processing, Dalian Fisheries Univ., Dalian 116023, China
Abstract: The optimal conditions of preparation of hydrolysates from a silver carp (Hypophthalmichthys molitrix) head with the maximal inhibition of angiotensin converting enzyme (ACE) were determined by measuring the inhibition effects (I) of the hydrolysates. Isolation of the hydrolysates and the molecular weight of the peptide were measured by Sephadex G-15. The results showed that there were five enzymes(trypsase, papain, pepsin, subtilisin, flavourzyme) that can hydrolyze silver carp head into hydrolysates. The pepsin had the maximal activity of 83.58%. The optimal hydrolysis conditions for pepsin were as the following: temperature 37℃, pH 2.0, 3 h period, E/S 1.4% and substances∶water = 1∶3. The molecular weight of the peptide with the highest inhibition activity was 1 096Da.