Novel N-unsaturated fatty acyl and N-trimethylacetyl derivatives of chitosan
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文摘
Novel N-oleoyl (d.s. 0·93), N-linolenoyl (d.s. 0·93), N-elaidoyl (d.s. 0·88), N-erucoyl (d.s. 0·87) and seven N-trimethylacetyl (d.s. 0·16-0·85) derivatives of chitosan were isolated in 54-91 % yields as a gel or a precipitate from the corresponding carboxylic anhydride. These derivatives were insoluble in common organic solvents, except for partially N-trimethylacetyl derivatives (d.s. 0·30-0·54) which were soluble in water. N-Trimethylacetyl derivative (d.s. 0·65) was isolated in 83 % yield, and was insoluble in water. Their chemical structures were determined with reference to the corresponding crystalline derivatives of d-glucosamine.