Laurencin Danielle, Wong Alan, Dupree Ray, Smith Mark E
Department of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, United Kingdom, UK.
Magn Reson Chem. 2008 Apr;46(4):347-50. doi: 10.1002/mrc.2117.
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 (delta(iso), C(Q) and eta(Q)) of each site were determined by multiple magnetic-field simulations. The peaks with delta(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.
在三个不同磁场（8.45、14.1和18.8 T）下对羟基磷灰石（Ca(10)(PO(4))(6)(OH)(2)）进行了天然丰度（43）Ca固态核磁共振。在18.8 T时，通过光谱分辨出了磷灰石结构中两个晶体学上不同的钙位点。通过多磁场模拟确定了每个位点的（43）Ca核磁共振相互作用参数（δ(iso)、C(Q)和η(Q)）。根据相对强度，δ(iso) = 11.2 ± 0.8 ppm和 - 1.8 ± 0.8 ppm的峰，其C(Q)均为2.6 ± 0.4 MHz，分别被指定为Ca(II)和Ca(I)位点。
