The invention discloses a method for preparing fishskin fish-scale collagen
protein. The method includes the steps of
processing fishskin,
processing fish scale, preparing collagen
protein and the like. The
fish scale processing includes the steps of preprocessing, decalcifying, neutralizing and removing immunities, washing, injecting
sol,
solid and liquid separation, filtering and obtaining a water-soluble collagen solution generated after
fish scale is removed. The collagen
protein preparing includes the steps of
hydrolysis, enzymolysis, collagen protein filtering and separation,
enzyme deactivation, decolorization, fishy smell
elimination,
drying and the like. The ash content in obtained
collagen peptide is obviously lower than that of other enzymolysis methods, and no fishy smell exists. According to the method,
hydrolysis is conducted on collagen through compound
protease and bromelain, the yield of micromolecule
collagen peptide is high, and the enzymic preparation is low in cost and free of
bitter taste. By means of the method, the production cost of the
collagen peptide can be lowered remarkably, the obtained collagen
peptide is white and tasteless
powder, the ash content is smaller than 0.5%, and
peptide fragment with the molecular weight smaller than 3000 Da accounts for over 96% of
total nitrogen.