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Characteristics of chitosans. (a) Reaction between chitosan and carboxylic acid anhydride, where R=(CH2)4CH3- hexanoyl-chitosan; R=(CH2)2 COOH- succinoyl-chitosan. (b–d) 1H-NMR spectra of (b) Chitosan with MM 200 kDa and DD 86% (c) Succinoyl chitosan with degree substitution (DS) 80% (d) Hexanoyl-chitosan with (DS) 10%.
