In order to study the similarities and differences of physical-chemical properties of collagens from different parts of the fish body, acid-soluble collagens and pepsin-soluble collagens were isolated from skin, scale, and bone of grass carp (Ctenopharyngodon idellus), with yields ranging from 0.7 to 25.5% on the basis of dry weight. The content of acid-soluble collagen in skin and scale was much higher than that in bone according to the data of extraction yield. Collagens from grass carp have similar amino acid composition, protein patterns, and sequences of primary structure. Thermal transit...
