Biomimetic Modification of Phosphonized Chitosan Membrane

Abstract

Abstract: Biomimetic growth of calcium phosphate over chitosan might be an effective approach to constitute inorganic/organic composite biomaterial. In this study, N-methylene phosphonic chitosan(NPCS) was synthesized via formaldehyde addition and condensation with phosphoric acid in a step reaction. The NPCS obtained was characterized by FTIR, XPS and ICP analyses. A stimulated body fluid was used to deposit hydroxyapatite(HA) on the surfaces of NPCS film. SEM and water contact angle measurement were performed to evaluate the surface texture and hydrophilicity of the materials. The data of XRD and EDX demonstrated that HA layer deposited on NPCS film surface in a SBF, has a low crystallinity with n(Ca)/n(P) being nearly 1.60 when immersing time extended for 20 days.

Key words: Chitosan, Phosphonation, Hydroxyapatite(HA), Composite material

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ZHANG Min, CUI Jun-Feng, YIN Yu-Ji, YAO Kang-De . Biomimetic Modification of Phosphonized Chitosan Membrane[J]. Chem. J. Chinese Universities, 2005, 26(3): 550.

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Biomimetic Modification of Phosphonized Chitosan Membrane

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