关键词: 胶原, 提取方法, 明胶, 胶原蛋白, collagen, preparation method, gelatin, collagen polypeptide

Abstract: In this paper, the concepts and differences of collagen, gelatin and collagen polypeptide were expounded. The structure of collagen and the differences between collagen type I and collagen type II were introduced, too. Seven preparation methods of collagen were summarized, while the advantages and disadvantages of each preparation method were analyzed to provide reference for the preparation of collagen from aquatic animal resources.