Study on the Crosslinking Modification of Collagen-Based Materials by DMTMM

Abstract

In order to explore the mechanism of interaction between DMTMM and collagen-based materials, gelatin was used as a skin simulant and prepare DMTMM crosslinked modified gelatin materials. FT-IR and Zeta potential measurements were used to analyze and characterize DMTMM crosslinking modified gelatin materials; revealing the mechanism of interaction between DMTMM and collagen-based materials. Firstly, the “zero-length” crosslinking agent DMTMM activated the carboxyl groups on the collagen-based materials and promoted the formation of amide bonds between the collagen-based materials. At the same time, the hydrogen bond formed between the hydroxyl group and its active group causes zero-length crosslinking modification of collagen-based material under the joint action of these two kinds of bonding. DSC, TG, swelling properties, SEM and other analytical methods were used to test the thermal stability and microstructure of DMTMM crosslinked modified gelatin materials. It was found that DMTMM can effectively improve the stability of collagen-based materials, increase the thermal denaturation temperature and humidity and reduce the decomposition rate.