Solid state31NMR studies of the conversion of amorphous tricalcium phosphate to apatitic tricalcium phosphate |
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| Authors: | James E Roberts Monique Heughebaert Jean-Claude Heughebaert Laurence C Bonar Melvin J Glimcher Robert G Griffin |
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| Institution: | (1) Francis Bitter National Magnet Laboratory Massachusetts Institute of Technology Cambridge, 02139, Massachusetts, USA;(2) Laboratoire de Physico-Chimie des Solides, Encole Nationale Superieure de Chimie, UA 445, 31400 Toulouse, France;(3) Laboratory for the Study of Skeletal Disorders and Rehabilitation, Department of Orthopaedic Surgery, Harvard Medical School, 300 Longwooe Avenue, Enders 11, 02115 Boston, Massachusetts, USA;(4) Children's Hospital, 300 Longwood Avenue, Enders 11, 02115 Boston, Massachusetts, USA;(5) Present address: Department of Chemistry, Lehigh University, Seely Mudd Building 6, 18015 Bethlehem, PA |
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| Abstract: | Summary The hydrolytic conversion of a solid amorphous calcium phosphate of empirical formula Ca9(PO4)6 to a poorly crystalline apatitic phase, under conditions where Ca2+ and PO4
3− were conserved, was studied by means of solid-state magic-angle sample spinning31P-NMR (nuclear magnetic resonance). Results showed a gradual decrease in hydrated amorphous calcium phosphate and the formation
of two new PO4
3−-containing components: an apatitic component similar to poorly crystalline hydroxyapatite and a protonated PO4
3−, probably HPO4
2− in a dicalcium phosphate dihydrate (DCPD) brushite-like configuration. This latter component resembles the brushite-like
HPO4
2− component previously observed by31P-NMR in apatitic calcium phosphates of biological origin. Results were consistent with previous studies by Heughebaert and
Montel 18] of the kinetics of the conversion of amorphous calcium phosphate to hydroxyapatite under the same conditions. |
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