Amino acid composition and functional properties of collagen polypeptide from Yak (Bos grunniens) bone.

摘要

Collagen polypeptide was prepared from Yak bone by applying papain as a catalyst. Its relative molecular weight distribution and amino acid composition were determined. Moreover, its main functional properties including water and oil absorption, water-holding capacity, emulsifying ability and stability, foaming ability and foam stability were investigated. The polypeptide had a molecular weight distribution of 11.7-43 kDa, in which most distributed at 11.7-25.3 kDa. It was high in glycine, alanine, proline, hydroxyproline and glutamic acid but low in methionine, tyrosine and histidine, the total amino acid amount being 88.06 g/100 g. The polypeptide showed good water adsorption, water-holding capacity, oil absorption, emulsifying and foaming properties. It is hoped to be applied in food and cosmetic. All rights reserved, Elsevier.