The invention discloses a preparing method of gradient collagen and collagen polypeptide molecules. The preparing method particularly comprises the steps of
defatting, deodorizing, primary enzymolysis, secondary enzymolysis and the like. The invention further discloses application of the gradient collagen and collagen polypeptide molecules. The gradient collagen and collagen polypeptide moleculescan be applied to the fields of
cosmetics,
skin care products, nourishing and health products, food additives, feed and the like. According to the preparing method of the gradient collagen and collagen polypeptide molecules, animal skins are subjected to procedures such as
defatting, deodorizing, primary enzymolosis and secondary enzymolysis to be prepared into the collagen and collagen polypeptide molecules with different molecular weights, the procedures are simple, the
enzymatic hydrolysis degree of collagen is increased, and thus products are smaller in molecular weight and easy to absorbby the
human body. The preparing method of the gradient collagen and collagen polypeptide molecules has good
defatting, deodorizing and decolorizing effects and facilitates improvement of the qualityof the products; the whole technology process is simple and reasonable, the safety is high, the
operability is high, and the products are high in yield and good in quality.