Abstract
Native concentrations of α-ionone, β-ionone, and β-damascenone were studied in various authentic and commercial wines. In addition, the enantiomeric distribution of α-ionone was determined and its merits as a potential marker for aroma adulteration in wine were discussed. For extraction of volatiles, headspace solid-phase microextraction (HS-SPME) was applied, followed by heart-cut multidimensional gas chromatography coupled to tandem mass spectrometric detection for trace-level analysis. The enantioselective analysis of α-ionone was achieved with octakis(2,3-di-O-pentyl-6-O-methyl)-γ-cyclodextrin as the chiral selector in the separation column for gas chromatography (GC). In all the authentic wines studied, α-ionone showed a high enantiomeric ratio in favor of the (R)-enantiomer. Since an illegal addition of α-ionone in a racemic form changes the enantiomeric ratio, this ratio may serve as an adulteration marker. Concentrations varied between <LOD to 0.081 μg/L for α-ionone, <LOD to 1.0 μg/L for β-ionone, and 0.03–10.3 μg/L for β-damascenone. Commercial wines of suspiciously strong flavor yielded concentrations up to 4.6 μg/L for α-ionone, 3.6 μg/L for β-ionone, and 4.3 μg/L for β-damascenone. Elevated α- and β-ionone concentrations serve as additional indicators for a potential adulteration. In order to classify the concentrations of the analytes in the context of their odor activity in wine, odor thresholds were determined.
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Acknowledgments
The authors thank the institutions for the donation of reference wine samples (Staatsweingut mit Johannitergut, Neustadt an der Weinstraße, Germany; Höhere Bundeslehranstalt für Wein- und Obstbau Klosterneuburg, Klosterneuburg, Austria; and the Staatliche Lehr- und Versuchsanstalt für Wein- und Obstbau Weinsberg, Weinsberg, Germany). Furthermore, we are thankful for the wine samples from food and wine control authorities in the Rheinland-Pfalz state, Germany. We are particularly grateful to Sandra Klink (DLR Rheinpfalz, Germany) and her team for the sensory analysis and Ulrich Fischer for the fruitful comments and discussions on the manuscript. We also appreciate the support from Carien Coetzee (Stellenbosch University, South Africa) in the early method development stages. Financial support from the Ministerium für Umwelt, Landwirtschaft, Ernährung, Weinbau und Forsten (Rheinland-Pfalz, Germany) is also gratefully acknowledged. We are also indebted to Engela Kritzinger (DLR Rheinpfalz) for language editing.
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This paper is dedicated to Prof. Dr. Peter Schieberle (Freising, Germany) on the occasion of his 65th birthday.
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Langen, J., Wegmann-Herr, P. & Schmarr, HG. Quantitative determination of α-ionone, β-ionone, and β-damascenone and enantiodifferentiation of α-ionone in wine for authenticity control using multidimensional gas chromatography with tandem mass spectrometric detection. Anal Bioanal Chem 408, 6483–6496 (2016). https://doi.org/10.1007/s00216-016-9767-6
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DOI: https://doi.org/10.1007/s00216-016-9767-6