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Swelling ratio of different HEC ratios to (A) LCS-acetate; (B) LCS-lactate; (C) LCS-malate; (D) LCS-succinate; and (E) LCS-citrate in simulated gastric fluid.
Abbreviations: A, acetic acid; L, lactic acid; M, malic acid; S, succinic acid; C, citric acid; LCS, chitosan 50–190 kDa; HEC, hydroxyethyl cellulose.
