Suppression of postprandial blood glucose elevation by buckwheat(Fagpopyrum esculentum) albumin hydrolysate and identification of the peptide responsible to the function  

作　　者：Kazumi Ninomiya Yusuke Yamaguchi Fumie Shinmachi Hitoshi Kumagai Hitomi Kumagai 

机构地区：[1]Department of Food Science and Nutrition,Kyoritsu Women’s University,2-2-1 Hitotsubashi,Chiyoda-ku,Tokyo 101-8347,Japan [2]College of Bioresource Sciences,Nihon University,1866 Kameino,Fujisawa-shi 252-0880,Japan

出　　处：《Food Science and Human Wellness》2022年第4期992-998,共7页食品科学与人类健康（英文）

摘　　要：The objective of this study is to evaluate the suppressive effect of buckwheat-albumin hydrolysate on postprandial hyperglycemia and identify the peptide responsible to the function. Buckwheat-albumin hydrolysate was prepared by using digestive enzymes and was orally administered to rats together with soluble starch. The blood was taken from the tail vein up to 90 min after oral administration to measure blood-glucose and plasma-insulin levels. The peptide with α-amylase inhibitory activity was purified from the buckwheathydrolysate by gel-filtration chromatography, α-amylase affinity chromatography, and high performance liquid chromatography(HPLC). The amino-acid sequence of the peptide was identified by a protein sequencer and was compared with that in the buckwheat-genome database. Buckwheat-albumin hydrolysate significantly suppressed the elevation of blood glucose level 15 min after starch administration. The amino-acid sequence of the peptide with α-amylase inhibitory activity was YVEPDCGNLGCCYHC in the parental protein of molecular mass 17.8 k Da and theoretical pI 4.77. The amino-acid sequence, molecular weight, and pI of the parental protein in buckwheat albumin were different from those of α-amylase inhibitor in wheat albumin. This study suggests that the novel α-amylase inhibitor identified in buckwheat albumin is a potential candidate for a functional food material to suppress postprandial blood glucose elevation.

关 键 词：Buckwheat-albumin hydrolysate Bioactive peptide α-Amylase inhibitor Postprandial hyperglycemia Type 2 diabetes 

分 类 号：TS210.1[轻工技术与工程—粮食、油脂及植物蛋白工程]