engleski

Insight into the chemical diversity of late/ice harvest Gewürztraminer wine

Late harvest (LHW) and ice harvest (IHW) Gew € urztraminer wine samples from Croatia (Ilok) were investigated. Their technological parameters, chromaticity coordinates, total phenols content, and antioxidant capacity were determined. 5-(Hydroxymethyl)furfural, xanthine, and trans-caftaric acid were analyzed in the samples by high performance liquid chromatography (HPLC-DAD). Headspace solid-phase microextraction (HS-SPME) followed by gas chromatography and mass spectrometry (GC/MS) analysis revealed isoamyl alcohol as predominant compound (21.25 – 60.30%). Diethyl succinate, 2- phenylethanol, and benzaldehyde were also abundant. Ethyl octanoate (1.48 – 5.70%) and ethyl caprate (0.48 – 4.83%) decreased signi fi cantly in LHW, being the lowest in IHW. Two solvents were applied for the samples extraction (solvent A – pentane/diethyl ether 1:2 (v/v) and solvent B – dichloromethane), and the extracts were analyzed by GC/MS. Ethyl hydrogen succinate (solvent A: 27.30 – 52.04% ; solvent B: 28.04 – 46.69%) and diethyl succinate (solvent A: 5.21 – 18.2% ; solvent B: 2.66 – 7.72%) were predominant in IHW and LHW. Aromatic alcohols were also found: 2-phenylethanol (solvent A: 7.07 – 21.09% ; solvent B: 5.50 – 11.82%), 4-hydroxybenzyl alcohol (solvent A: 1.45 – 6.68% ; solvent B: 2.47 – 12.16%) and benzyl alcohol (solvent A: 0.10 – 0.77%). The obtained results complement a previous study on IHW (Gew € urztraminer) from Croatia providing new features and indicating great chemical diversity among the samples.

late/ice harvest wine, volatiles, targeted polar compounds, antioxidant activities, GC/MS, HPLC-DAD

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