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Molecules, Vol. 23, Pages 160: Cool-Climate Red Wines—Chemical Composition and Comparison of Two Protocols for 1H–NMR Analysis

Molecules, Vol. 23, Pages 160: Cool-Climate Red Wines—Chemical Composition and Comparison of Two Protocols for 1H–NMR Analysis

Molecules doi: 10.3390/molecules23010160

Authors: Violetta Aru Klavs Sørensen Bekzod Khakimov Torben Toldam-Andersen Søren Balling Engelsen

This study investigates the metabolome of 26 experimental cool-climate wines made from 22 grape varieties using two different protocols for wine analysis by proton nuclear magnetic resonance (1H–NMR) spectroscopy. The wine samples were analyzed as-is (wet) and as dried samples. The NMR datasets were preprocessed by alignment and mean centering. No normalization or scaling was performed. The “wet” method preserved the inherent properties of the samples and provided a fast and effective overview of the molecular composition of the wines. The “dried” method yielded a slightly better sensitivity towards a broader range of the compounds present in wines. A total of 27 metabolites including amino acids, organic acids, sugars, and alkaloids were identified in the 1H–NMR spectra of the wine samples. Principal component analysis was performed on both NMR datasets evidencing well-defined molecular fingerprints for ‘Baco Noir’, ‘Bolero’, ‘Cabernet Cantor’, ‘Cabernet Cortis’, ‘Don Muscat’, ‘Eszter’, ‘Golubok’, ‘New York Muscat’, ‘Regent’, ‘Rondo’, ‘Triomphe d’Alsace’, ‘Précose Noir’, and ‘Vinoslivy’ wines. Amongst the identified metabolites, lactic acid, succinic acid, acetic acid, gallic acid, glycerol, and methanol were found to drive sample groupings. The 1H–NMR data was compared to the absolute concentration values obtained from a reference Fourier transform infrared method, evidencing a high correlation.

Authors:   Aru, Violetta ; Sørensen, Klavs Martin; Khakimov, Bekzod ; Toldam-Andersen, Torben Bo; Balling Engelsen, Søren
Journal:   Molecules
Volume:   23
edition:   1
Year:   2018
Pages:   160
DOI:   10.3390/molecules23010160
Publication date:   13-Jan-2018
Facts, background information, dossiers
  • wine
  • samples
  • molecules
  • Rondo
  • Reference
  • Proton
  • concentration
  • Andersen
  • amino acids
  • alkaloids
More about Molecular Diversity Preservation International
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