Method of Preparing Functional Peptides from Germinated Beans

A method of preparing a functional peptide from a germinated bean, comprising the following steps:

• (1) germinating a bean to obtain a germinated bean with a sprout length of 0.5-1.0 cm;
• (2) adding water to the germinated bean obtained from step (1), and then blending and crushing the germinated bean to obtain a slurry, wherein the germinated bean and the water are in a weight ratio of 1:0.9-1.1;
• and
• (3) adjusting the slurry obtained from step (2) to a pH value between 6.5-8.0, and then adding neutral protease, papain and compound flavor protease to perform enzymatic reaction under stiffing condition at a temperature between 50-55° C. for 2.5-3.5 hours, wherein an enzymatic reaction solution is obtained comprising the functional peptide;
• wherein the neutral protease and the germinated bean obtained from step (1) are in a weight ratio of 0.9-1.1%, the papain and the germinated bean obtained from step (1) are in a weight ratio of 0.9-1.1%, and the compound flavor protease and the germinated bean obtained from step (1) are in a weight ratio of 0.9-1.1%.