High resolution 43 Ca solid-state NMR studies of hydroxyapatite (Ca 10 (PO 4 ) 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 1 H- 43 Ca rotational echo double resonance and 1 H- 43 Ca cross polarization magic angle spinning experiments.
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Laurencin et al. (2008) studied this question.
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