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With the increasing number of collagen products, consumers are becoming more and more plausible about collagen. The purpose of this paper is to enable the reader to achieve accurate, pleasant and efficient consumption while popularizing knowledge.

Gelatin is a denatured product of collagen under high temperature. Its composition is complex and its molecular weight distribution is wide. Due to the high temperature, collagen is denatured, and the three-stranded helical structure of collagen molecules is destroyed. However, some α-chain helix chains may still exist. Therefore, a certain concentration of gelatin solution can be gelatinized. It is widely used in the food industry, photography and pharmaceutical industries. According to reports, 65% of the gelatin products produced worldwide each year are used in the food industry, 20% in the photographic industry and 10% in the pharmaceutical industry.

Hydrolyzed collagen is obtained by hydrolyzing collagen or gelatin with protease at higher temperature. Due to the dual action of temperature and enzyme, the relative molecular mass of hydrolyzed collagen is smaller than gelatin, because at higher temperature, protease to collagen The hydrolysis of peptide bonds is random, and the composition of the protein solution obtained by hydrolysis is also complicated, and is a mixture of protein polypeptides having a relative molecular mass of several thousand to several tens of thousands. Due to its small molecular weight, hydrolyzed collagen is easily degraded, so it has a certain market in the development of nutraceuticals and daily chemicals.

Hydrolyzed collagen can be used in biological fermentation medium, and can also be used as a high-protein feed nutritional supplement to replace imported fishmeal for mixed and compound feed production.

Although collagen, gelatin and hydrolyzed collagen have homology, they differ greatly in structure and properties.

Collagen retains its unique natural helical structure, which in some respects is significantly superior to gelatin and hydrolyzed collagen. For example, collagen hemostatic sponge has better hemostatic properties than gelatin sponge. Fish collagen as a clarifying agent has significantly reduced sedimentation ability if it is denatured. . However, people's understanding of these three substances is often confused, they are considered to have the same nature, and even they are considered to be the same substance.