Preparation method of wheat protein peptide chelated calcium

The invention discloses a preparation method of wheat protein peptide chelated calcium, which comprises the following steps: adding wheat protein into deionized water, dispersing to prepare a suspension, sequentially carrying out starch removal purification, ultrasonic modification, enzymolysis and high-temperature enzyme deactivation treatment, centrifuging an enzymolysis product at a rotating speed of 4000-6000 r/min, collecting supernate, and freeze-drying to obtain the wheat protein peptide chelated calcium. The wheat protein peptide powder is obtained; then preparing a wheat protein peptide solution with the mass concentration of 3%, adding inorganic calcium for chelating, cooling a chelating solution formed by reaction, precipitating with absolute ethyl alcohol, and drying into powder, so as to obtain the wheat protein peptide calcium chelate. The ultrasonic modification treatment conditions are that the ultrasonic power is 180 to 270 W, and the time is 30 to 50 minutes; protease used in the enzymolysis