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Published on: October 5, 2016
Kinetic observations of non-volatile phenolic compounds during storage and accelerated aging of white wine from Vitis
Friederike A Schnitker1, Katharina Becker1, Christoph Schuessler2
1Department of Beverage Research, Chair Analysis & Technology of Plant-based Foods, Geisenheim University, Von-Lade-Strasse 1, 65366 Geisenheim, Germany.
Abstract:
The aim of this study was to identify non-volatile phenolic compounds in Vitis vinifera L. cv. 'Riesling' wine and to determine their reactivity in relation to storage time and temperature. Wine samples were stored at different temperatures (16, 24, 36 °C) and analyzed using UHPLC-DAD as well as quantitative 1H NMR and FT-MIR spectroscopy. Kinetic parameters were determined for the degradation or formation of key phenolic compounds in order to evaluate the changes occurring due to different storage conditions. All analyzed compounds exhibited temperature-dependent changes in concentration over time. Hereby, trans-fertaric and trans-caftaric acid emerged as being stable at 16 °C but rapidly degraded at elevated temperatures. Principal component analysis (PCA) revealed that the UHPLC data explained most of the variance, while 1H NMR and FT-MIR data contributed less. These findings emphasize the importance of (U)HPLC analyses in observing chemical changes during wine storage and their potential for evaluating wine quality.
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