The invention relates to a method for
processing soybean isolated
protein by utilizing a biological
enzyme technology. The method comprises the following steps of: during preparation, selecting high-quality
soy protein isolate, and dissolving; performing
thermal denaturation; adjusting the pH value to 8.0 to 9.0; adding composite
hydrolase of alkali
protease,
neutral protease,
papain and
trypsin, and reacting for 2 to 3 hours; adjusting the pH value to 4.0 to 6.0; inactivating
enzyme; when cooling to a temperature below 50 DEG C, adding filter aid
enzyme; collecting filtrate to dissolve filter residues; adding composite
hydrolase of acidic
protease,
neutral protease,
papain and
trypsin, and reacting for 1 to 2 hours; inactivating the enzyme; when cooling to temperature of below 50 DEG C, adding the filter aid enzyme; filtering by a
paperboard; performing
ultrafiltration;
drying by microwaves under vacuum; and crushing and sieving. The soybean polypeptide
powder prepared by the method can improve the
solubility of albumen
powder to a maximum limit and keep the color and luster of appearance,
mouthfeel, flavors and the bioactivity of active ingredients, offers a good
mouthfeel, is easy to absorb and can be widely applied to industry of dairy products, drinks and health-care products.