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Advanced Solvent Signal Suppression for the Acquisition of 1D and 2D NMR Spectra of Scotch Whisky

2017; Wiley; Volume: 55; Issue: 9 Linguagem: Inglês

10.1002/mrc.4628

1097-458X

William Kew, Nicholle G. A. Bell, Ian Goodall, Dušan Uhrı́n,

Advanced MRI Techniques and Applications

Scotch Whisky is a culturally significant high value commodity. To gain a better understanding of the production processes and whisky maturation chemistry as well as addressing authenticity concerns, advances in chemical analysis of whisky are required. NMR spectroscopy represents a means to detect, identify, and quantify all major components of whisky by a single technique. It is an untargeted technique allowing for simultaneous profiling of different compound classes, albeit with a limited dynamic range and sensitivity. In common with other alcoholic beverages, whisky primarily comprises of two protonated compounds – water and ethanol. Their signals dominate the standard 1H spectra of spirits and need to be suppressed to allow observation of important lower-abundance congeners. We have presented a simple and robust solvent suppression technique that enables acquisition of high quality NMR spectra of alcoholic beverages on cryoprobe instruments and applied it to acquire 1D and 2D NMR spectra of Scotch Whisky.