Premium
Advanced solvent signal suppression for the acquisition of 1D and 2D NMR spectra of Scotch Whisky
Author(s) -
Kew Will,
Bell Nicholle G.A.,
Goodall Ian,
Uhrín Dušan
Publication year - 2017
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.4621
Subject(s) - heteronuclear single quantum coherence spectroscopy , chemistry , two dimensional nuclear magnetic resonance spectroscopy , heteronuclear molecule , nuclear magnetic resonance spectroscopy , spectroscopy , nuclear overhauser effect , pulse sequence , nmr spectra database , solvent , analytical chemistry (journal) , transverse relaxation optimized spectroscopy , spectral line , chemical shift , relaxation (psychology) , nuclear magnetic resonance , fluorine 19 nmr , stereochemistry , chromatography , organic chemistry , physics , social psychology , quantum mechanics , astronomy , psychology
A simple and robust solvent suppression technique that enables acquisition of high‐quality 1D 1 H nuclear magnetic resonance (NMR) spectra of alcoholic beverages on cryoprobe instruments was developed and applied to acquire NMR spectra of Scotch Whisky. The method uses 3 channels to suppress signals of water and ethanol, including those of 13 C satellites of ethanol. It is executed in automation allowing high throughput investigations of alcoholic beverages. On the basis of the well‐established 1D nuclear Overhauser spectroscopy (NOESY) solvent suppression technique, this method suppresses the solvent at the beginning of the pulse sequence, producing pure phase signals minimally affected by the relaxation. The developed solvent suppression procedure was integrated into several homocorrelated and heterocorrelated 2D NMR experiments, including 2D correlation spectroscopy (COSY), 2D total correlation spectroscopy (TOCSY), 2D band‐selective TOCSY, 2D J ‐resolved spectroscopy, 2D 1 H, 13 C heteronuclear single‐quantum correlation spectroscopy (HSQC), 2D 1 H, 13 C HSQC‐TOCSY, and 2D 1 H, 13 C heteronuclear multiple‐bond correlation spectroscopy (HMBC). A 1D chemical‐shift‐selective TOCSY experiments was also modified. The wealth of information obtained by these experiments will assist in NMR structure elucidation of Scotch Whisky congeners and generally the composition of alcoholic beverages at the molecular level.