Oyster peptide with effect of improving sexual function and preparation method thereof

An oyster oligopeptide composition, wherein the oyster oligopeptide composition at least comprises peptide segments RI, IR and VR in its composition;

• based on a mass of the oyster oligopeptide composition, a content of the RI is ≥3.60 mg/100 g, a content of the IR is ≥7.60 mg/100 g, and a content of the VR is ≥6.50 mg/100 g;
• wherein the oyster oligopeptide composition is prepared as follows:
• 1) adding water to an oyster meat raw material to obtain a mixed material liquid, adding concentrated hydrochloric acid to the mixed material liquid and stirring, and collecting a precipitate after solid-liquid separation;
• 2) adding water to the precipitate to obtain a slurry, adding alkali to perform a protein denaturation treatment at 85-90° C., so as to obtain a denatured solution of oyster protein;
• 3) adding a neutral protease and a papain to the denatured solution of oyster protein, and performing enzymolysis treatment for 3-6 h, so as to obtain an enzymolysis solution after the neutral protease and the papain are inactivated;
• 4) centrifuging the enzymolysis solution to obtain a centrifugal supernatant, and then performing treatments of filtration and column chromatography on the centrifugal supernatant in sequence, so as to obtain the oyster oligopeptide composition.