Collagen protein is the highest protein content in vivo of mammal,playing the role in supporting the organs,protecting organism function.In recent years,with the development of the methods of extracting collagen protein and deep research of its structural,properties,the functional properties of clooagen and its peptide are widely realized,the research and application of collagen have become a hotspot in biological and medical industry,food industry,cosmetics industry,etc.The structure and properties of cloo...