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Title: Carbonate substitution in the mineral component of bone: Discriminating the structural changes, simultaneously imposed by carbonate in A and B sites of apatite

Abstract

The mineral component of bone and other biological calcifications is primarily a carbonate substituted calcium apatite. Integration of carbonate into two sites, substitution for phosphate (B-type carbonate) and substitution for hydroxide (A-type carbonate), influences the crystal properties which relate to the functional properties of bone. In the present work, a series of AB-type carbonated apatites (AB-CAp) having varying A-type and B-type carbonate weight fractions were prepared and analyzed by Fourier transform infrared spectroscopy (FTIR), powder X-ray diffraction (XRD), and carbonate analysis. A detailed characterization of A-site and B-site carbonate assignment in the FTIR ν{sub 3} region is proposed. The mass fractions of carbonate in A-site and B-site of AB-CAp correlate differently with crystal axis length and crystallite domain size. In this series of samples reduction in crystal domain size correlates only with A-type carbonate which indicates that carbonate in the A-site is more disruptive to the apatite structure than carbonate in the B-site. High temperature methods were required to produce significant A-type carbonation of apatite, indicating a higher energy barrier for the formation of A-type carbonate than for B-type carbonate. This is consistent with the dominance of B-type carbonate substitution in low temperature synthetic and biological apatites. - Graphical abstract:more » A series of differently substituted high temperature AB-type carbonated apatites show interesting structural changes, an additional B-carbonate site with the presence of A-carbonate in the apatite, and crystal domain sizes that correlate only with the amount of A-site carbonate. Our results provide an explanation for the dominance of B-type carbonate in biominerals. Display Omitted - Highlights: • Series of AB-type carbonated apatites with varying carbonate levels synthesized. • FTIR indicates additional orientations for B-site CO{sub 3}{sup 2-} with A-type substitution. • Crystal domain lengths correlate only to A-site CO{sub 3}{sup 2-} in high-temp AB-apatites.« less

Authors:
; ;
Publication Date:
OSTI Identifier:
22742053
Resource Type:
Journal Article
Journal Name:
Journal of Solid State Chemistry
Additional Journal Information:
Journal Volume: 255; Other Information: Copyright (c) 2017 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0022-4596
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; APATITES; CARBONATES; CRYSTALS; FOURIER TRANSFORM SPECTROMETERS; INFRARED SPECTRA; SKELETON; TEMPERATURE RANGE 0065-0273 K; TEMPERATURE RANGE 0400-1000 K; X-RAY DIFFRACTION

Citation Formats

Madupalli, Honey, Pavan, Barbara, and Tecklenburg, Mary M.J., E-mail: mary.tecklenburg@cmich.edu. Carbonate substitution in the mineral component of bone: Discriminating the structural changes, simultaneously imposed by carbonate in A and B sites of apatite. United States: N. p., 2017. Web. doi:10.1016/J.JSSC.2017.07.025.
Madupalli, Honey, Pavan, Barbara, & Tecklenburg, Mary M.J., E-mail: mary.tecklenburg@cmich.edu. Carbonate substitution in the mineral component of bone: Discriminating the structural changes, simultaneously imposed by carbonate in A and B sites of apatite. United States. doi:10.1016/J.JSSC.2017.07.025.
Madupalli, Honey, Pavan, Barbara, and Tecklenburg, Mary M.J., E-mail: mary.tecklenburg@cmich.edu. Wed . "Carbonate substitution in the mineral component of bone: Discriminating the structural changes, simultaneously imposed by carbonate in A and B sites of apatite". United States. doi:10.1016/J.JSSC.2017.07.025.
@article{osti_22742053,
title = {Carbonate substitution in the mineral component of bone: Discriminating the structural changes, simultaneously imposed by carbonate in A and B sites of apatite},
author = {Madupalli, Honey and Pavan, Barbara and Tecklenburg, Mary M.J., E-mail: mary.tecklenburg@cmich.edu},
abstractNote = {The mineral component of bone and other biological calcifications is primarily a carbonate substituted calcium apatite. Integration of carbonate into two sites, substitution for phosphate (B-type carbonate) and substitution for hydroxide (A-type carbonate), influences the crystal properties which relate to the functional properties of bone. In the present work, a series of AB-type carbonated apatites (AB-CAp) having varying A-type and B-type carbonate weight fractions were prepared and analyzed by Fourier transform infrared spectroscopy (FTIR), powder X-ray diffraction (XRD), and carbonate analysis. A detailed characterization of A-site and B-site carbonate assignment in the FTIR ν{sub 3} region is proposed. The mass fractions of carbonate in A-site and B-site of AB-CAp correlate differently with crystal axis length and crystallite domain size. In this series of samples reduction in crystal domain size correlates only with A-type carbonate which indicates that carbonate in the A-site is more disruptive to the apatite structure than carbonate in the B-site. High temperature methods were required to produce significant A-type carbonation of apatite, indicating a higher energy barrier for the formation of A-type carbonate than for B-type carbonate. This is consistent with the dominance of B-type carbonate substitution in low temperature synthetic and biological apatites. - Graphical abstract: A series of differently substituted high temperature AB-type carbonated apatites show interesting structural changes, an additional B-carbonate site with the presence of A-carbonate in the apatite, and crystal domain sizes that correlate only with the amount of A-site carbonate. Our results provide an explanation for the dominance of B-type carbonate in biominerals. Display Omitted - Highlights: • Series of AB-type carbonated apatites with varying carbonate levels synthesized. • FTIR indicates additional orientations for B-site CO{sub 3}{sup 2-} with A-type substitution. • Crystal domain lengths correlate only to A-site CO{sub 3}{sup 2-} in high-temp AB-apatites.},
doi = {10.1016/J.JSSC.2017.07.025},
journal = {Journal of Solid State Chemistry},
issn = {0022-4596},
number = ,
volume = 255,
place = {United States},
year = {2017},
month = {11}
}