# Highlighting the Terroir Influence on the Aromatic Profile of Two Romanian White Wines
## 3 Results and Discussion  
A wine quality is influenced by the concentration of polyphenols, the method of their accumulation, but also the sensory effects they cause. The determination of the Folin-Ciocalteu index provides essential information regarding the content of polyphenols in the wine and their classification in sensory classes, while the index of total polyphenols refers to the measurement of the absorbance of delocalized electrons from the benzene cycles existing in the polyphenols in the wine [35]. Figure 1 shows the Folin-Ciocalteu (FCI) and total polyphenol (TPI) indexes within the analysed samples. The values of the Folin-Ciocalteu indexes were 6.2 and 8.8 for Feetasca alba and Feetasca regala, from Aiud region. Feetasca alba wines from Salagiu and Sarica Niculiitel had a lower polyphenic potential, a fact that will influence their supplements and astringency. It was observed that, among Feetasca alba wines, the one from Aiud region had the higher total polyphenol index (blue colour). With respect to the Feetasca regala wines, the highest value for the total polyphenol index was registered for Feetasca regala from Aiud vineyard (blue colour). The highest Folin-Ciocalteu index (green colour) was obtained for Feetasca regala (among the Feetasca regala wines) and for Feetasca alba (among Feetasca alba wines), both from Aiud vineyard. A total of 35 aroma compounds were determined through the GC-MS method (Supplementary Material--Table S1), showing significant values for each variety of wine (Feetasca  
Figure 1: Determination of Folin–Ciocalteu (FCI) and total polyphenol (TPI) indexes in wines. alba, Feteasca regala), correlated with the origin area. In this respect, various alcohols, acids, esters, terpenes, and aldehydes were evidenced. Figure 2 presents the determined alcohols in the two wine types from every vineyard. A total of 17 superior alcohols were evidenced within the two types of wine (Figure 1, Supplementary Material--Table S1). Among them, 2-phenyl ethanol was distinguished by its higher level in all samples with a concentration that varied from 7692 ug/L (in Feteasca alba from Sarica Nicultel) up to 11,783 ug/L (in Feteasca regala from Sarica Nicultel). This compound, together with some aromatic esters, offers one of the most pleasant aromas, resembling roses' flavour [43]. Higher concentrations of isopentyl alcohol were observed in all six samples, varying from 8092 ug/L in Feteasca alba from Sarica Nicultel to 10,036 ug/L in Feteasca regala from Aiud. Its presence in white wines was correlated with the starch's fermentation, the compound being the product of the mentioned process. The lowest concentration was registered for terpineol (2.37 ug/L in Feteasca alba from Aiud vineyard). It was observed that, in Feteasca regala from all the vineyards, this compound had higher concentrations than in Feteasca alba, varying from 124 ug/L in Feteasca regala from Sarica Nicultel up to 172 ug/L in Feteasca regala from Aiud. A characteristic feature of this compound is the floral aroma. The increased content of terpineol with the time of wine ageing can be an indicator for the berry's ripeness. The wines from the three vineyards reached a superior alcohol status compared with Feteasca alba and Feteasca regala from another Romanian region, Crisana, located in the southwest of the country [44; 45]. The obtained values were also compared with the alcohol  
Figure 2: Alcohol compositional profile for Feteasca alba and Feteasca regala. content of white wines from Moldavia, observing that the studied ones had higher values of linalool and terpineol [46]. Figure 3 highlights the determined esters in the two wine types from every vineyard. Diethyl succinate was one of the main esters in all six samples (Supplementary Material--Table S1), with a concentration of 777 \(\mathrm{\SIUnitSymbolMicro g}\)/L in Feteasca alba from Sarica Niculitel to 1119 \(\mathrm{\SIUnitSymbolMicro g}\)/L in Feteasca regala from Aiud.