The native SPI was rapidly hydrolyzed by papain, while was markedly resistant to the trypsin and chymotrypsin because of the trypsin inhibitor.

• 木瓜蛋白酶对大豆分离蛋白的水解最迅速、彻底,由于大豆蛋白中含有胰蛋白酶抑制因子,胰蛋白酶和胰凝乳蛋白酶对大豆蛋白水解能力较差。