Department of Physics, Ubon Ratchathani University, Thailand.
J Biomol NMR. 2011 Jul;50(3):277-84. doi: 10.1007/s10858-011-9516-2. Epub 2011 Jun 11.
An approach for conveniently implementing low-power CN ( n ) (ν) and RN ( n ) (ν) symmetry-based band-selective mixing sequences for generating homo- and heteronuclear chemical shift correlation NMR spectra of low γ nuclei in biological solids is demonstrated. Efficient magnetisation transfer characteristics are achieved by selecting appropriate symmetries requiring the application of basic RF elements of relatively long duration and numerically tailoring the RF field modulation profile of the basic element. The efficacy of the approach is experimentally shown by the acquisition of (15)N-(13)C dipolar and (13)C-(13)C scalar and dipolar coupling mediated chemical shift correlation spectra at representative MAS frequencies.
本文展示了一种方便实现低功率 CN(n)(ν)和 RN(n)(ν)对称基带选择混合序列的方法，用于生成生物固体中低γ核的同核和异核化学位移相关 NMR 谱。通过选择适当的对称性，可以实现有效的磁化转移特性，这些对称性要求应用相对较长持续时间的基本 RF 元件，并对基本元件的 RF 场调制轮廓进行数值调整。通过在代表性的 MAS 频率下采集 (15)N-(13)C 偶极和 (13)C-(13)C 标量和偶极耦合介导的化学位移相关谱，实验证明了该方法的有效性。
