J. Am. Chem. Soc.,

ASAP Article 10.1021/ja710557t S0002-7863(71)00557-2 Web Release Date: February 1, 2008 Copyright © 2008 American Chemical Society
A High-Resolution 43Ca Solid-State NMR Study of the Calcium Sites of Hydroxyapatite
Danielle Laurencin, Alan Wong, John

Abstract:
High resolution 43Ca solid-state NMR studies of hydroxyapatite (Ca10(PO4)6(OH)2) were performed at 14.1 T. The two crystallographically distinct calcium sites were unequivocally resolved by a triple-quantum magic angle spinning experiment, and the unambiguous assignment of the signals was possible using 1H-43Ca rotational echo double resonance and 1H-43Ca cross polarization magic angle spinning experiments.