使用非转子同步的rCW辐照在MAS固态NMR中实现高效异核去耦。
Efficient heteronuclear decoupling in MAS solid-state NMR using non-rotor-synchronized rCW irradiation.
作者信息
Equbal Asif, Paul Subhradip, Mithu Venus Singh, Madhu P K, Nielsen Niels Chr
机构信息
Center for Insoluble Protein Structures (inSPIN), Interdisciplinary Nanoscience Center (iNANO) and Department of Chemistry, Aarhus University, Gustav Wieds Vej 14, DK-8000 Aarhus C, Denmark.
Department of Chemistry, Center for Excellence in Basic Sciences, University of Mumbai and Department of Atomic Energy, Health Centre, University of Mumbai, Vidhyanagari Campus, Mumbai 400098, India.
出版信息
J Magn Reson. 2014 Sep;246:104-9. doi: 10.1016/j.jmr.2014.07.006. Epub 2014 Jul 19.
We present new non-rotor-synchronized variants of the recently introduced refocused continuous wave (rCW) heteronuclear decoupling method significantly improving the performance relative to the original rotor-synchronized variants. Under non-rotor-synchronized conditions the rCW decoupling sequences provide more efficient decoupling, are easier to setup, and prove more robust towards experimental parameters such as radio frequency (rf) field amplitude and spinning frequency. This is demonstrated through numerical simulations substantiated with experimental results under different sample spinning and rf field amplitude conditions for powder samples of U-(13)C-glycine and U-(13)C-L-histidine·HCl·H2O.
我们展示了最近引入的重聚焦连续波（rCW）异核去耦方法的新的非转子同步变体，相对于原始的转子同步变体，其性能有显著提升。在非转子同步条件下，rCW去耦序列提供了更高效的去耦，更易于设置，并且对诸如射频（rf）场幅度和自旋频率等实验参数表现出更强的鲁棒性。这通过数值模拟得到了证明，这些模拟结果在不同样品自旋和rf场幅度条件下，以U-(13)C-甘氨酸和U-(13)C-L-组氨酸·HCl·H2O粉末样品的实验结果为依据。
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