## 2 Materials and Methods
### Wine Samples  
In the present study, a total of 25 commercial wine samples were analyzed. The 2007 vintage wines, bottled in glass, were provided by the producers or distributors in 2009. HPLC-DAD analyses were carried out when the samples reached three years of age. Tables 1 and 2 show the Croatian monovarietal red and white wines studied, respectively, with their corresponding abbreviations, wine types, grape varieties, wine regions, subregions, and vineyard localities. Croatia is divided into four wine regions [13]. Dalmatia is one of the two coastal wine regions of Croatia covering the area from the city of Zadar and its hinterland to the Konavle region in the extreme south, and from which the wine samples marked with blue circles in Figure 1 originate. Istria and Kvarner is the wine region in the northwestern part of the Croatian Adriatic coast. The samples of Istrian wines are marked in purple in Figure 1. The continental part of Croatia is also represented by two regions. The Croatian Highlands is the wine region in the northwestern part of Croatia, while the Slavonia and Croatian Danube region is located on the predominantly flat eastern mainland of Croatia. In Figure 1, the wine samples from these regions are marked in orange and green, respectively. \begin{table}
\begin{tabular}{c c c c c} \hline \hline
**Sample** & **Grape Variety** & **Croatian Wine Region** & **Croatian Wine Subregion** & **Vineyard Location** \\ \hline wMD & Malvazija Istarska & Istraía and Kvarner & Istraía & Dajla (Novigrad) \\ wMA & Malvasia Bianca Lunga & Dalmatia & Central and Southern & Ston (Peljésac \\ wMS & Malvasia Bianca Lunga & Dalmatia & Northern Dalmatia & Skradin \\ wCR & Chardonnay & Istraía and Kvarner & Istraía & Radovani (Visnjan) \\ wCB & Chardonnay & Slavonia and Croatian & Croatian Danube & Banovo brdo (Beli \\ wGJ & Welschriesling & Conatian Uplands & Medimurje & Zelezna gora (Strigova) \\ wGK & Welschriesling & Slavonia and Croatian & Slavonia & Hrnjavac (Kutjevo) \\ wSD & Sauvignon Blanc & Slavonia and Croatian & Slavonia & Dulovac (Daruvar) \\ wTI & Traminer & Slavonia and Croatian & Claudine & Principovac (Iolk) \\ wRD & Rhine Riesling & Slavonia and Croatian & Slavonia & Dulovac (Daruvar) \\ wFD & Furmint & Croatian Uplands & Medimurje & Lopatinec (Sv. Juraj na \\ wPD & Pinot Blanc & Croatian Uplands & Medimurje & Bregu) \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Data on the studied varietal white wines from different Croatian wine regions. \begin{table}
\begin{tabular}{c c c c c} \hline \hline
**Sample** & **Grape Variety** & **Croatian Wine Region** & **Croatian Wine Subregion** & **Vineyard Location** \\ \hline rPD & Plavac Mali & Dalmatia & Central and Southern & Ivan Dolac, (Island \\  & & & Dalmatia & Hvar) \\ \hline rPI & Plavac Mali & Dalmatia & Central and Southern & Postup (Peljésac \\  & & & Dalmatia & Peninsula) \\ \hline rBS & Babić & Dalmatia & Northern Dalmatia & Primosten \\ \hline rTD & Teran & Istraía and Kvarner & Istraía & Dajla (Novigrad) \\ \hline rCD & Cabernet Sauvignon & Dalmatia & Central and Southern & Konavle \\  & & & Dalmatia & Lorlat (Benkovac) \\ \hline rCK & Cabernet Sauvignon & Dalmatia & Dalmatian Hinterland & Korlat (Benkovac) \\ \hline rCA & Cabernet Sauvignon & Istraía and Kvarner & Istraía & Mornarica (Poreč) \\ \hline rCB & Cabernet Sauvignon & Slavonia and Croatian & Croatian Danube & Banovo brdo (Beli \\  & & Danube & Manastir) \\ \hline rMK & Merlot & Dalmatia & Dalmatian Hinterland & Korlat (Benkovac) \\ \hline rMA & Merlot & Istraía and Kvarner & Istraía & Faragude (Funtana) \\ \hline rSK & Syrah & Dalmatia & Dalmatian Hinterland & Korlat (Benkovac) \\ \hline rPM & Blauer Portugieser & Croatian Uplands & Plesivica Hills & Okić (Plesivica) \\ \hline rPK & Pinot Noir & Slavonia and Croatian & Slavonia & Hrnjavac (Kutjevo) \\  & & Danube & Slavonia & Hrnjavac (Kutjevo) \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Data on the studied varietal red wines from different Croatian wine regions.