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Investigation of the mineral phases of bone by solid-state phosphorus-31 magic angle sample spinning nuclear magnetic resonance


Investigation of the mineral phases of bone by solid-state phosphorus-31 magic angle sample spinning nuclear magnetic resonance



Biochemistry 23(25): 6115-6120



ISSN/ISBN: 0006-2960

PMID: 6525350

DOI: 10.1021/bi00320a033

Phosphorus-31 magic angle sample spinning NMR spectra have been employed to investigate the structure and composition of the mineral deposits in chicken bone. Three different pulse sequences, Bloch decay, cross-polarization, and dipolar suppression, were employed to obtain spectra from bone specimens of varying age. These were compared to the spectra obtained from a variety of crystalline and noncrystalline synthetic calcium phosphate solids used as reference standards. The results suggest that the most suitable model for the major solid calcium phosphate mineral phase in bone is a hydroxyapatite containing approximately 5-10% CO32- and approximately 5-10% HPO42- groups, the latter in a brushite-like configuration. From the NMR line shapes it was deduced that the fraction of HPO42- groups was highest in the youngest bone and decreased progressively with increasing age of the specimen.

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Accession: 017972563

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