Title of article :
Porous calcium phosphate coating over phosphorylated chitosan film by a biomimetic method
Author/Authors :
H. K. Varma، نويسنده , , Y. Yokogawa، نويسنده , , F. F. Espinosa، نويسنده , , Y. Kawamoto، نويسنده , , K. Nishizawa، نويسنده , , F. Nagata، نويسنده , , T. Kameyama، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 1999
Pages :
6
From page :
879
To page :
884
Abstract :
A porous calcium phosphate coating deposited on chitosan films was studied using scanning electron microscopy, energy-dispersive X-ray analysis, micro-Fourier transform infrared spectroscopy (micro-FTIR) and thin-film X-ray diffractometry (XRD). Chitosan films were first prepared by dissolving chitosan powder in dilute acetic acid and drying in a flat petri dish. The films were phosphorylated using urea and H3PO4 with the P content being 0.1–0.2 wt%. Phosphorylated films soaked in saturated Ca(OH)2 solution for 8 days led to the formation of a calcium phosphate precursor phase over the entire surface. This precursor phase stimulated the growth of a porous coating of calcium-deficient hydroxy apatite when immersed in 1.5×SBF for more than 20 days. Phosphorylated films not treated with Ca(OH)2 did not show any calcium phosphate growth upon immersion in SBF solution. The precursor phase is thought to be octacalcium phosphate, which nucleates a HAP phase during SBF treatment. Initially, this treatment in SBF results in the formation of a single-layer calcium phosphate particles over the film surface. As immersion time in SBF increases, further nucleation and growth produce a porous HAP coating. The Ca/P ratio of the HAP coating is a function of SBF immersion time.
Keywords :
biomimetic , Coating , Calcium Phosphate , Chitosan
Journal title :
Biomaterials
Serial Year :
1999
Journal title :
Biomaterials
Record number :
543246
Link To Document :
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