Solvent Suppression in Pure Shift NMR
Solvent Suppression in Pure Shift NMR
复制标题
纯位移 NMR 中的溶剂抑制
DOI:
10.1021/acs.analchem.3c05379
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发表时间:
2024
影响因子:
7.4
通讯作者:
Gates E
中科院分区:
文献类型:
--
作者:
Gates E
Intense solvent signals in1H solution-state NMR experiments typically cause severe distortion of spectra and mask nearby solute signals. It is often infeasible or undesirable to replace a solvent with its perdeuterated form, for example, when analyzing formulations in situ, when exchangeable protons are present, or for practical reasons. Solvent signal suppression techniques are therefore required. WATERGATE methods are well-known to provide good solvent suppression while enabling retention of signals undergoing chemical exchange with the solvent signal. Spectra of mixtures, such as pharmaceutical formulations, are often complicated by signal overlap, high dynamic range, the narrow spectral width of1H NMR, and signal multiplicity. Here, we show that by combining WATERGATE solvent suppression with pure shift NMR, ultrahigh-resolution1H NMR spectra can be acquired while suppressing intense solvent signals and retaining exchangeable1H signals. The new method is demonstrated in the analysis of cyanocobalamin, a vitamin B12 supplement, and of an eye-drop formulation of atropine.
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