制备米糠蛋白降血压肽最佳用酶的筛选

摘要

试验以筛选制备米糠蛋白降压肽最佳用酶为目的。选用碱性蛋白酶、碱性蛋白酶Alcalase 2.4 L、中性蛋白酶、木瓜蛋白酶、胰蛋白酶、胰凝乳蛋白酶、蛋白酶K和双酶复合水解米糠蛋白,以血管紧张素转化酶（ACE）抑制率为主要指标,筛选出制备米糠蛋白降压肽的最佳用酶。结果表明,米糠降压肽ACE抑制率的大小与酶的种类及配比有关,筛选出碱性蛋白酶Alcalase为试验用酶,在酶解温度45℃,加酶量3 000 U.g-1,酶解pH8.5,米糠蛋白底物浓度3%酶解2 h时达到最大抑制率为71.1%。%The aim of this study was to select the best enzyme for rice bran protein.Rice bran protein was enzymolysised by alkali protease,Alcalase 2.4 L,neutral protease,papain,trysase,chymotrypsin,proteinase K and double enzyme composite to produce antihypertensive peptides,with ACE inhibiting rate as major indicator.The results indicated that ACE inhibiting rate of antihypertensive peptides in rice bran was related to the kind of enzyme and their ratio,and the best enzyme was alkali protease,the enzyme hydrolysis conditions were： hydrolysis temperature 45 ℃,the enzyme addition 3 000 U·g-1,pH8.5,substrate concentration 3%,hydrolysis time 2 h,its highest inhibiting rate reached 71.1%.