Journal
TETRAHEDRON
Volume 71, Issue 20, Pages 3032-3038Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tet.2014.12.014
Keywords
Acetaldehyde; Glycerol; Acetal; Wine; Oxidation
Categories
Funding
- American Viticulture Foundation [14-1540]
- Horace O. Lanza Scholarship
- Rusty Staub Endowed Fellowship
- Mario P. Tribuno Memorial Research Scholarship
- Wine Spectator Scholarship
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Heterocyclic acetals from acetaldehyde and glycerol have been proposed as markers of age and oxidation in fortified wines. Here the analysis of these acetals (cis- and trans-5-hydroxy-2-methyl-1,3-dioxane and cis- and trans-4-hydroxymethyl-2-methyl-1,3-dioxolane) by liquid-liquid extraction and gas chromatography-mass spectrometry was optimized for rapid monitoring of these compounds in aged and oxidized table wines. The method provides a wide range of linearity and reproducibility below 3.0% RSD, while the detection limits, 2.85-13.5 mu g/L, were significantly lower than typical levels measured in wines. Stable isotope dilution improved the accuracy of the method. Oxidation of red wines was shown to correlate with increased levels of the acetals. The accuracy and speed of the new method will allow for quantifying oxidation in large experiments such as wine aging or micro-oxygenation trials, and to assess the potential value of these substances as markers of wine oxidation. (C) 2014 Elsevier Ltd. All rights reserved.
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