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Type: Journal article
Title: The aggregation behavior of O-carboxymethylchitosan in dilute aqueous solution
Author: Zhu, A.
Chan-Park, M.
Dai, S.
Li, L.
Citation: Colloids and Surfaces B-Biointerfaces, 2005; 43(3-4):143-149
Publisher: Elsevier Science BV
Issue Date: 2005
ISSN: 0927-7765
Statement of
Aiping Zhu, Mary. B. Chan-Park, Sheng Dai and Lin Li
Abstract: O-Carboxymethylchitosan (OCMCS) is a kind of biocompatible derivatives of chitosan whose water solubility is strongly dependent on the degree of carboxymethylation. The OCMCS with 100 carboxymethyl groups and 75 amino groups per 100 anhydroglucosamine units of OCMCS was synthesized by the reaction of chitosan and monochloroacetic. When OCMCS was dissolved in water, its solution was neutral and OCMCS behaved like a weak polyanionic polyeclectrolyte because most of carboxylic groups were not dissociated in neutral aqueous solution. The aggregation behavior of OCMCS in aqueous solution was studied by surface tensiometry, steady-state fluorescence spectroscopy and viscometry. The critical aggregation concentration (cac) of OCMCS was determined to be between 0.042 mg/ml and 0.050 mg/ml. The possible aggregation mechanism of OCMCS in water was elucidated.
Keywords: O-Carboxymethylchitosan; amphiphilic; characterization; aggregation mechanism
Rights: © 2005 Elsevier B.V. All rights reserved.
RMID: 0020112543
DOI: 10.1016/j.colsurfb.2005.04.009
Appears in Collections:Chemical Engineering publications

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