LAUSR

BACKGROUND Official stable isotope databases, based on the analysis of (D/H)I ethanol , (D/H)II ethanol , δ13 Cethanol and δ18 Owater of wine, are today an indispensable tool for establishing the limits beyond which the mislabelling or the addition of sugar and/or water in wine production can be detected. This study investigates, for the first time, whether the use of hybrid varieties instead of European Vitis vinifera for wine production can have an impact on the mentioned stable isotope ratios. RESULTS The analyses were performed by isotope ratio mass spectrometry (IRMS) and site-specific natural isotope fractionation by nuclear magnetic resonance (SNIF-NMR), according to the official methods of the International Organization of Grapes and Wine (OIV). The comparison shows the tendency of some stable isotope ratios of hybrid varieties, in particular (D/H)I , to deviate from the regional averages of the Vitis Vinifera samples. Notably, Baron, Monarch and Regent showed significantly different values ​​at one of the two sampling sites. Particularly high δ13 C values characterise Helios compared to other hybrid varieties. CONCLUSION For the first time, this study investigates, from an isotopic point of view, the wine obtained from hybrid varieties, showing that further attention should be paid to their interpretation, on the basis of the database established according to the European Regulation 2018/273. This article is protected by copyright. All rights reserved.