Molecular structural properties of extracted gelatin from Yak skin as analysed based on molecular weight

Abstract

This paper dealt with the physicochemical, functional and antioxidative properties of Yak skin gelatins with various molecular weights. The gelatin was extracted by alkaline process, and different molecular weight gelatin was achieved by ultrafiltration with different molecular weight cut membrane. The SDS-PAGE showed the molecular weight of the yak skin gelatin. The UV-Vis absorption turned out that the high molecular weight (HMW) of yak skin gelatin had a higher maximum absorption peaks. The FT-IR indicated the change of gelatin structures with the change of the molecular weight. No matter the HMW or the low molecular weight (LMW), the Yak skin gelatin had a high denaturation temperature (Td), and it was higher than most of the other mammals and marine biological gelatin. The HMW gelatin had higher imino acids contents and lower oxidation resistance, foamability and emulsibility compared to the LMW gelatin. These findings showed that a certain molecular weight range of Yak skin gelatin has great potential for application as an alternative to commercial gelatin due to its good antioxidative, foamability emulsibility and thermotolerance.