Natural abundance 43Ca solid-state NMR characterisation of hydroxyapatite: identification of the two calcium sites
✍ Scribed by Danielle Laurencin; Alan Wong; Ray Dupree; Mark E. Smith
- Publisher
- John Wiley and Sons
- Year
- 2008
- Tongue
- English
- Weight
- 171 KB
- Volume
- 46
- Category
- Article
- ISSN
- 0749-1581
- DOI
- 10.1002/mrc.2117
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✦ Synopsis
Abstract
Natural abundance ^43^Ca solid‐state NMR of hydroxyapatite (Ca~10~(PO~4~)~6~(OH)~2~) was performed at three different fields (8.45, 14.1 and 18.8 T). The two crystallographically distinct calcium sites of the apatite structure were spectroscopically resolved at 18.8 T. The ^43^Ca NMR interaction parameters (δ~iso~, C~Q~ and eta~Q~) of each site were determined by multiple magnetic‐field simulations. The peaks with δ~iso~ = 11.2 ± 0.8 and − 1.8 ± 0.8 ppm, both with C~Q~ = 2.6 ± 0.4 MHz, were assigned to the Ca(II) and Ca(I) sites, respectively, on the basis of their relative intensities. Copyright © 2008 John Wiley & Sons, Ltd.