The invention discloses an extraction method of collagen polypeptide and active
calcium in walleye pollock bone. The method comprises the following steps: (I) pretreating the
raw material; (II) preparing
bone collagen polypeptide through the substeps of (1) soaking
fish bone in a NaOH solution and then carrying out high-temperature and high-pressure treatment, (2) extracting the
bone collagen, (3) carrying out treatment via a high-
voltage pulsed
electric field, and (4) carrying out enzymolysis by firstly adding composite collagen
protease for enzymolysis, then adding
flavor protease for enzymolysis, decolorizing and deordorizing, carrying out
spray drying to obtain the collagen polypeptide; and (III) preparing active
calcium in
fish bone through the substeps of (1) extracting
tartaric acid, (2) extracting
tartaric acid again, and (3) combining the extracted tartaric acids to prepare the active
calcium in the
fish bone. Through the extraction method, the disadvantages of thick fishy smell,
bitter taste and unfavorable peculiar smells of the marine source collagen polypeptide can be overcome; the collagen polypeptide of the walleye pollock bone which is free of pungent smell, delicious and moderate in taste can be prepared; meanwhile, the bone dreg can be economically and efficiently used for preparing active
tartaric acid chelated calcium; the
utilization rate of the walleye pollock bone is increased; the high-value utilization is achieved.