Journal
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
Volume 408, Issue 10, Pages 2425-2439Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00216-016-9379-1
Keywords
1,2-Propanediol; Phenyl boronic acid; Heart-cut multidimensional gas chromatography; Mass spectrometric detection; Enantiodifferentiation; Adulteration
Funding
- Ministerium fur Umwelt, Landwirtschaft, Ernahrung, Weinbau und Forsten (Rheinland-Pfalz, Germany)
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Native concentrations and enantiomeric distribution of 1,2-propanediol in various wines were studied in order to evaluate its merits as a potential marker for aroma adulteration in wine. Heart-cut multidimensional gas chromatography coupled to mass spectrometry was applied to analyze 1,2-propanediol after salting-out of the polar phase, derivatization with phenyl boronic acid, and extraction with cyclohexane. The enantiomeric separation of the derivative was achieved with heptakis-(6-O-tert. butyl dimethylsilyl-2,3-di-O-acetyl)-beta-cyclodextrin as the chiral selector. In all authentic wines studied, 1,2-propanediol showed a high enantiomeric ratio in favor of the (R)-enantiomer, proving its potential as a marker for the adulteration with flavor extracts based on industrial 1,2-propandiol as solvent. Usually, concentrations varied between 15 and 100 mg/L. Higher values (up to 170 mg/L) were found in wines made with high amounts of dry berries. However, despite the higher concentrations of 1,2-propanediol in such wines, no apparent influence on the enantiomeric distribution could be detected.
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