Synthesis in a gel as a new procedure for preparing carboxyethyl chitosan

A fundamentally new procedure of synthesis of carboxyethyl chitosan in a physical gel, ensuring higher degree of substitution at lower temperatures and lower consumption of time and chemicals, compared to the existing procedures, was developed. The structure of the resulting products was examined by diffuse reflection IR and H-1 NMR spectroscopy in solutions and also H-1 and Li-7 broad line NMR.