Differentiation of biological hydroxyapatite compounds by infrared spectroscopy, x-ray diffraction and extended x-ray absorption fine structure

Pure hydroxyapatite (HAP) and HAP doped with 800 ppm of zinc were implanted in cortical bone of femur diaphysis of ovines [J. L. Irigaray , Mater. Cli n. Appl. 28, 399 (1999)]. We observed that the doped HAP was better resorbe d than pure HAP. The first hypothesis is that zinc acts as a stimulator on macrophage cells and improves quantity and quality of osteoblast cells. The second hypothesis is that zinc yields HAP structure that is better resorbe d in biological field. For our experiment we used HAP doped with 3000 ppm o f zinc in order to have a good sensitivity. In the present work, chemical s tudies by inductively coupled plasma absorption emission spectrometry, x ra y diffraction, and infrared were carried out to determine the composition o f major and trace elements in the doped hydroxyapatite, and the crystallogr aphic structure. These studies can indicate possible modifications induced by the insertion of zinc. We used the extended x-ray absorption fine struct ure experimental station of LURE (Orsay, France) to try to clarify the atom ic surroundings of zinc in doped HAP structure and transformations induced in initial lattice. Despite the low zinc concentration, we got good quality fluorescence mode spectra. These spectra showed medium range order of the material that is consistent with its crystalline form. To perform the analy sis, we compared the result obtained with another models like beta tricalci um phosphate and we created theoretical models of zinc in substitution of c alcium in order to reproduce as well as possible the experimental spectrum. After this study, only two models are coherent with experimental spectrum, zinc in substitution of calcium in site I and zinc in the interstice betwe en the two hydroxydes. (C) 2001 American Institute of Physics.