The invention discloses fishbone bioactive polypeptide
calcium powder and a preparation method, belonging to the field of
functional food or food additives. The preparation method comprises the following steps: freezing fishbone, coarse
grinding, fine
grinding, adding water, stirring, adding a compound
protease to hydrolyze, centrifugating, and respectively collecting the supernatant and the precipitate; ultrafiltering the supernatant by a filter membrane, concentrating the filtrate, and freeze-
drying to obtain the fishbone
protein polypeptide
powder; washing the precipitate,
drying and pulverizing; activating by using
citric acid, and
drying to obtain the soluble
calcium; and mixing the fishbone
protein polypeptide
powder and the soluble
calcium to obtain the fishbone bioactive polypeptide calcium powder. The fishbone bioactive polypeptide calcium powder enables the biological absorptivity of calcium to reach above 65%, and meanwhile, maintains the functional characteristics of polypeptide.
Hydrolysis is carried out by using the food-grade
protease, and thus, the fishbone bioactive polypeptide calcium powder has the advantages of high safety and no
side effect. The method of the invention has the advantages of simple and feasible realization, and low cost. The fishbone bioactive polypeptide calcium powder can be used as a
food additive or directly eaten as nutritional food.