The invention relates to hydrolyzed D90 demineralized whey
powder and a preparation method thereof. The hydrolyzed D90 demineralized whey
powder comprises a D90 demineralized whey solution, a
protease preparation, and an
acidity regulator. The preparation method comprises the steps of preparing the D90 demineralized whey solution by dissolving sweet whey
powder with water, and performing desalinization treatment to remove mineral substances, allowing the D90 demineralized whey solution to enter an tank, performing circulating heating, adjusting the pH target value of the D90 demineralized whey circularly-heated material solution by adding
potassium hydroxide, adding
trypsin and
neutral protease into the D90 demineralized whey solution, performing enzymolysis on the D90 demineralized whey solution under stirring in a circulating heating and heat preservation condition, performing circulating cooling on material liquid in which the D90 demineralized whey solution is in the end of
hydrolysis to inhibit the activation of enzymes, performing sterilizing,
enzyme deactivation and concentration by using an
evaporator for concentration, and performing
spray drying by using a
spray drying tower to prepare a dried powdery product. According to the invention, the nutritive value of the demineralized whey powder is further improved, and the
protein allergy influence is reduced, the
protein nutrition absorption efficiency is improved, and the hydrolyzed D90 demineralized whey powder and the preparation method thereof are applied to the technical field of food
nutrition.