## 3 Results and Discussion
### Gcxc-Tof-Ms
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\begin{table}
\begin{tabular}{c c c c c c c c c c c c c c} \hline \hline
**No. ** & **Volatile Compounds** & **(Io (ID))** & **(Io (ID))** & **ID** & **LRSup** & **LRIn** & **\(F\)-Ratio** & \multicolumn{4}{c}{**Variety**} \\ \cline{4-13}  & & **(minos)** & **(minos)** & & & & & & & **MI** & **PO** & **MA** & **KR** & **SK** \\ \hline \multirow{2}{*}{26} & Ethyl & &  
No significant differences were found between the concentrations of hydrocarbons, while aldehydes also turned out to be poor varietal differentiators, with significant differences found only for decanal (Table 2). On the other hand, several ketones were found useful for this purpose: the highest concentration of 2-undecanone and 3-undecanone was specific for Malvazija istarska, 1,4,7,10,13-pentaoxacyclononadecane-14,19-dione and cyclohexylideneacetone were characteristic for Skrlet, while the lowest concentration of isophorone was found in Marastina wines. 4-Methyl-1-heptanol was the most useful among alcohols in differentiating monovarietal wines with a rather high \(F\)-ratio (Table 2). It was found in the highest concentration in Skrlet, followed by Malvazija istarska wines, while the other wines contained lower concentrations. The results for _cis_-3-hexen-1-ol were in accordance with those obtained by GC-MS, with the highest concentration found in Dalmatian Posip and Marastina wines. 3-Octanol and 1-octen-3-ol were exclusive markers for Posip, 2-decanol for Skrlet, while the lowest concentration of an isomer of 2-penten-1-ol was characteristic for Kraljevina wine. \(F\)-ratios determined for fatty acids were relatively low and significant differences were found only for five of them. A very large number of minor esters was identified by GC\(\times\)GC-TOF-MS analysis (Table 2). In accordance with the GC-MS data, the concentrations of the majority of esters of aliphatic higher alcohols and fatty acids were the highest in Malvazija istarska wines. Despite the thesis that precursor concentrations do not significantly determine the concentrations of acetate esters formed by _Saccharomyces cerevisiae_[60], the highest concentration of _cis_-3-hexen-1-yl acetate corresponded to the highest concentration of its precursor, _cis_-3-hexen-1-ol, found in Posip wine. Posip wine was the most abundant in particular esters of ethanol and hydroxyl keto acids, such as diethyl glutamate and ethyl pyruvate. Although without a statistically significant difference, the concentrations of the related esters, such as ethyl lactate and diethyl succinate, determined by GC-MS, also had a tendency to be higher in Posip wines. Posip wines contained the highest concentration of volatile phenols, such as 2-methoxyphenol and 4-vinylguaiacol. Significant differences were found for particular furanoids and lactones.