As a kind of Chinese traditional medicine, animal gelatin is obtained from animal skin, bone, nail, horn, and so on. The large similarity in structure and properties of gelatins from different origins makes their differentiation difficult. Now the quality control of animal gelatin is mainly depending on pharmacognosia methods which need more experiences and have a lower accuracy. The objective of this research was to develop the fingerprints of four animal gelatins including Dong E donkey-hide glue,...