Preliminary characterization of calcium chemical environment in apatitic and non-apatitic calcium phosphates of biological interest by X-ray absorption spectroscopy

被引:82
作者
Eichert, D [1 ]
Salomé, M
Banu, M
Susini, J
Rey, C
机构
[1] European Synchrotron Radiat Facil, Xray Microscopy Beamline ID21, Grenoble, France
[2] CIRIMAT, ENSIACET, F-31077 Toulouse, France
关键词
calcium phosphate; XAS; microspectroscopy; maturation; synchrotron;
D O I
10.1016/j.sab.2005.05.012
中图分类号
O433 [光谱学];
学科分类号
0703 ; 070302 ;
摘要
Several reports have mentioned the existence of non-apatitic environments of phosphate and carbonate ions in synthetic and biological poorly crystalline apatites. However there were no direct spectroscopic evidences for the existence of non-apatitic environment of calcium ions. X-ray Absorption Spectroscopy, at the K-edge of calcium, allows the discrimination between different calcium phosphates of biological interest despite great spectral similarities. A primary analysis of the spectra reveals the existence, in synthetic poorly crystalline apatites, of variable features related to the maturation stage of the sample and corresponding to the existence of non-apatitic environments of calcium ions. Although these features can also be found in several other calcium phosphate salts, and do not allow a clear identification of the ionic environments of calcium ions, they give a possibility to directly determine the maturity of poorly crystalline apatite from calcium X-ray Absorption Near Edge Structure spectra. (c) 2005 Elsevier B.V. All rights reserved.
引用
收藏
页码:850 / 858
页数:9
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