## 3 Results and Discussion
### GC\(\times\)GC-TOF-MS Volatile Metabolome
\begin{table}
\begin{tabular}{c c c c c c c c c c} \hline \hline \multirow{2}{*}{**No.**} & \multirow{2}{*}{**Volatile Compounds**} & \multirow{2}{*}{**tg (ID)**} & \multirow{2}{*}{**tg (2D)**} & \multirow{2}{*}{**ID**} & \multirow{2}{*}{**LR\({}_{\text{up}}\)**} & \multirow{2}{*}{**LR\({}_{\text{in}}\)**} & \multirow{2}{*}{**F.**} & \multirow{2}{*}{**Variety**} \\  & & & & & & & & & & **Ratio** & & \\ \hline \multicolumn{1}{c}{} & \multicolumn{1}{c}{**(min-sec)**} & \multicolumn{1}{c}{**(min-sec)**} & & & & & & **PM** & **TE** \\ \hline
197 & Ethyl methanesulfonate & 18:31.0 & 00:00.9 & MS & 1695 & na & 5.13 & 1.44 \(\pm\) 0.24 \({}^{\ast}\) & 1.18 \(\pm\) 0.19 \({}^{\text{b}}\) \\
198 & Methanol & 19:08.0 & 00:00.9 & S & MS, LRI & 1728 & 1733 & 2.73 & 56.4 \(\pm\) 19.8 & 80.2 \(\pm\) 32.6 \\
199 & Isothiyeanatocychoaeane & 18:17.0 & 00:01.6 & MS, LRI & 1681 & 1670 & 1.30 & 0.11 \(\pm\) 0.15 & 0.21 \(\pm\) 0.17 \\
200 & 2-Thiophenecarboxaldehyde & 18:45.0 & 00:01.0 & MS, LRI & 1708 & 1701 & 1.25 & 0.66 \(\pm\) 0.41 & 0.96 \(\pm\) 0.58 \\
201 & 3-(Methylthiopropyl) acetate & 17:29.6 & 00:01.2 & MS, LRI & 1631 & 1633 & 1.03 & 1.14 \(\pm\) 0.75 & 1.67 \(\pm\) 1.17 \\
202 & Methyl bisocyanate & 18:17.9 & 00:00.8 & MS, LRI & 1682 & na & 0.67 & 0.12 \(\pm\) 0.19 & 0.23 \(\pm\) 0.30 \\
203 & 3-(Methylthio)propanol & 13:58.5 & 00:01.0 & MS, LRI & 1458 & 1455 & 0.30 & 1.41 \(\pm\) 0.70 & 1.68 \(\pm\) 1.09 \\
204 & 2-(Methylthio)ethanol & 15:29.0 & 00:00.8 & S, MS, LRI & 1524 & 1523 & 0.22 & 4.21 \(\pm\) 0.60 & 3.97 \(\pm\) 1.24 \\  & \multicolumn{1}{c}{_Miscellaneous_} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} \\
205 & & 10:33.5 & 00:02.7 & S & MS, LRI & 1306 & 1300 & 21.07 & 18.29 \(\pm\) 3.01 \({}^{\ast}\) & 11.40 \(\pm\) 2.59 \({}^{\ast}\) \\
206 & 1,5,5,6-Tetramethyl-1,3-cyclohexadiene & 12:41.0 & 00:01.6 & MS & 1405 & na & 7.08 & 0.12 \(\pm\) 0.21 \({}^{\ast}\) & 0.57 \(\pm\) 0.40 \({}^{\ast}\) \\
207 & & Tetradecane & 12:47.5 & 00:02.7 & S, MS & 1410 & na & 4.51 & 0.88 \(\pm\) 0.34 & 0.48 \(\pm\) 0.36 \\
208 & & 1,2-Benisothize & 23:25.7 & 00:01.1 & MS, LRI & 1956 & 1955 & 0.30 & 0.11 \(\pm\) 0.12 & 0.15 \(\pm\) 0.16 \\
209 & _cis_-5-Hydroxy-2-methyl-1,3-dioxane & 14:48.2 & 00:00.9 & MS, LRI & 1492 & 1494 & 0.01 & 0.65 \(\pm\) 0.36 & 0.62 \(\pm\) 0.86 \\ \hline \hline \end{tabular}  
* ID—type of identification: S—comparison with retention time and mass spectrum of pure standards and with NIST 2.0, Wiley 8, and FFNNC 2 mass spectra electronic libraries; LRI—comparison with linear retention index from literature; MS—comparison with mass spectra from NIST 2.0, Wiley 8, and FFNNC 2 libraries or literature; n.i.—not identified. Only MS symbol in the ID column = tentative identification.
* Compounds were semi-quantified as equivalents of internal standard 2-octual with response factor = 1. LRI\({}_{\text{low}}\)—experimentally determined linear retention index. LRI\({}_{\text{in}}\)—linear retention index from literature. Varieties: PM—Plavac mali, TE—Teran. Statistically significant differences between mean values at \(p<0.05\), obtained by one-way ANOVA and least significant difference (LSD) test, are marked by different superscript lowercase letters in a row.  
\end{table} 
Table 3: \(Cont.\)quality of grapes and other fruits [48; 49; 50]. As the vineyards of the producers involved in this study were not irrigated, the availability of water depended on natural rainfall. During June and July, two months important for the development of grapes, the vines in both regions could have potentially suffered a certain degree of water stress due to relatively low rainfall in this period (Table S1). The effect was possibly more severe in Dalmatia where very low precipitation was recorded, especially in July.