PAA influence on chitosan membrane calcification

被引:27
作者
Beppu, MM [1 ]
Santana, CC [1 ]
机构
[1] UNICAMP, Fac Engn Quim, BR-13084970 Sao Paulo, Brazil
来源
MATERIALS SCIENCE & ENGINEERING C-BIOMIMETIC AND SUPRAMOLECULAR SYSTEMS | 2003年 / 23卷 / 05期
基金
巴西圣保罗研究基金会;
关键词
chitosan; calcification; biomimetic; PAA;
D O I
10.1016/j.msec.2003.08.002
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
This work discusses the influence of polyacrylic acid (PAA) on chitosan in vitro calcification. Calcium phosphate deposition on porous and dense (non-porous) chitosan membranes treated or not with PAA has been studied using scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX), X-ray diffraction, potentiometric titration and attenuated total reflectance infrared spectroscopy (ATR-IR). The experiments were carried out by soaking chitosan membranes in simulated body fluids (SBF), 1.0 and 1.5 times the human serum salt concentration, at 36.5degreesC during 7 days at pH 7.4 or 7.8. SEM micrographs showed that the use of these growth solutions resulted in substrates with significant coverage with calcium phosphate. PAA led to a higher coverage even at lower pH (7.4), but the morphological and chemical nature of deposits was remarkably different if compared to deposits on pure chitosan membranes. Although PAA has shown to promote a more intense deposition, probably by offering ion-binding sites adequate for nucleation, it does not necessarily determine a well-defined crystal growth orientation. (C) 2003 Elsevier B.V. All rights reserved.
引用
收藏
页码:651 / 658
页数:8
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