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Thermal processing temperature influence on hard tissue chemical composition

F. MICULESCU1,* , L. T. CIOCAN2, M. MICULESCU1, M. BRÂNZEI1, N. GHIBAN1

Affiliation

  1. University „POLITEHNICA”, Bucharest, Romania
  2. "Carol Davila” University of Medicine and Pharmacy, Bucharest, Romania

Abstract

In terms of chemical composition, some elements are essential to the human body functions and others are toxic. Due to the latter, the need to control their concentrations in human tissues appears. In Romania, there are few data on exposure to heavy metals, but in advanced countries there is a growing demand to assess this issue. In this study, the changes in the concentration of Pb, Cd, Sr, Zn, Cu, Fe, and Al in cortical bone as function of heat treatment temperature was analyzed, whereas the preparation of samples for compositional analysis and processing can involve heating at different temperatures in order to remove organic component. Elemental concentrations determination is also important, as hard tissues can be used to produce hydroxyapatite used for bone reconstruction operations. The analyzed samples were taken from subjects from the same areal. In addition to the above-mentioned elements, the concentrations of the major elements of the bone (Ca, P, Na, Mg, K, Si) were determined. To obtain a comprehensive traceability tissue samples from four individuals, of both sexes were analyzed. Heat treatment structural transformations were determined by thermal expansion. Comparing the chemical composition (determined comparatively by energy dispersive spectrometry - EDS and X-ray fluorescence spectrometry - XRF) of the natural state bone and the corresponding thermal treated ones from the same specimen (at 400, 800 and 1200°C), a statistically significant decrease in Pb, Hg and Cd quantity was observed in the heat treated material. Fewer changes in the other chemical elements concentration were observed. The heavy elements concentration decreasewas found to be proportional to the temperature level..

Keywords

Bone thermal treatment, Thermal expansion, Chemical composition by EDS, XRF.

Submitted at: March 25, 2013
Accepted at: July 11, 2013

Citation

F. MICULESCU, L. T. CIOCAN, M. MICULESCU, M. BRÂNZEI, N. GHIBAN, Thermal processing temperature influence on hard tissue chemical composition, Journal of Optoelectronics and Advanced Materials Vol. 15, Iss. 7-8, pp. 707-711 (2013)