N-Acylchitosan gels, N-arylidene- and N-alkylidene-chitosan gels, chitosan oxalate gels, and chitosan gel were prepared from chitosan by reactions of a series of carboxylic anhydrides, aryl- and alkylaldehydes, and oxalic acid. A chitin gel was prepared from chitin and alkaline chitin. An intramolecular conversion of chitosan oxalate gel to N-acetylchitosan (chi tin) gel via chitosan gel was demonstrated. The paper also presented a possible mechanism for the gelation of chitin and chitosan, the stability and some physical properties of these gels, the digestibility by lysozyme and chitinase, the stimulation of lysozyme activity in the blood of rabbits fed these compounds and in the culture of chicken embryo fibroblast cells in the presence of these compounds, and some possible applications in food industry.
KeywordsOxalate Anhydride Lactose Alginate Oligosaccharide
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