## Materials and Methods
### Grape VOC Gas Chromatography (GC-FID/MS) Analysis
\begin{table}
\begin{tabular}{c c c c c c c c c} \hline
**Compound** & **Skin F** & **Skin B** & **Juice F** & **Juice B** & **Calibration Equation** & **R\({}^{2}\)** & **Linearity Range (ug/mL)** & **RI** \\ \hline
2-Methyl-2-butanol \({}^{*}\) & x & x & x & x & 2-methyl-1-butanol & & & 1022 \\
5-Isopropyl-3,3-dimethyl-2-methylene-2-3-dihydrofuran & x & x & x & x & \(\alpha\) & 1026 & 1026 \\ Butyl acetate & x & x & x & x & y = 0.988\(\rm x-0.0037\) & 0.9991 & 0.002-2.38 & 1089 \\ Hexanal & x & x & x & y = 0.755\(\rm x-0.0064\) & 0.9995 & 0.002-2.4 & 1103 \\
1-Methyl-2-propanol & & x & x & & \(\alpha\) & 1143 & 1143 \\ Butamol & x & x & x & x & y = 0.1246\(\rm x-0.0174\) & 0.9969 & 0.008-0.84 & 1152 \\ Pent-3-en-2-sol \({}^{*}\) & x & x & x & x & (Zy-3-Heaven-1-ol). & & 1178 \\
2-Methyl-1-butanol & & & & y = 1.4888\(\rm x-0.0053\) & 0.9995 & 0.0002-0.238 & 1213 \\ n-Femund \({}^{*}\) & & & & Hexanal & & 1215 & \\ Limmemee \({}^{*}\) & x & x & x & x & \(\alpha\)-Terpineol & & 1217 \\
1-Methyloxyppm-2-yl acetate & x & x & x & & \(\alpha\) & 1233 & \\
2-Hetx-2-anal & x & x & & y = 1.391\(\rm x+0.0047\) & 0.9986 & 0.061–61.46 & 1241 \\
3-Qutenance & x & x & x & & \(\alpha\) & & 1269 \\
2-Methyl-1-butanol & x & x & x & & \(\alpha\) & & 1318 \\ Cyclohexanone & x & x & x & x & \(\alpha\) & & 1320 \\
1-Butoxypropan-2-ol & x & x & x & x & \(\alpha\) & & 1346 \\ Hexanal & & & & x & \(\alpha\) & & 0.001–0.986 & 1352 \\ (Z)-Hex-3-en-1-ol & & & & y = 1.816\(\rm x-0.0169\) & 0.9986 & 0.026–26.2 & 1372 \\ (F)-Hex-3-en-1-ol & & & & (Zy-2-3-en-1-ol) & & 1385 & \\ Nonmal & & & x & x & y = 1.256\(\rm x-0.0046\) & 0.9993 & 0.009–9.48 & 1403 \\ (F)-Hex-2-en-ol \({}^{*}\) & & & & (Zy-2-3-en-1-ol) & & & 1407 \\
2-Butoxyethanol-ol & & x & x & x & \(\alpha\)-Terpineol & & 1424 \\
2-Ethyl-1-hexanol & & x & x & x & y = 2.114\(\rm x+0.002\) & 0.999 & 0.013–12.56 & 1479 \\ Benzaldehyde & & x & x & x & y = 1.866\(\rm x-0.0122\) & 0.9985 & 0.003–2.52 & 1547 \\ Isophorone & & x & x & x & \(\alpha\) & 1622 & \\ Acetophenone & & x & x & x & y = 1.734\(\rm x-0.0012\) & 0.9968 & 0.0009–0.94 & 1672 \\ a-Terpineol & & x & x & x & y = 2.187\(\rm x-0.00039\) & 0.9986 & 0.001–1.42 & 1695 \\ Naphthalene & & x & x & x & x & \(\alpha\) & & 1764 \\ Hex-2-enoic acid & & x & x & x & \(\alpha\) & & 1818 \\
2-Ethyl-3-hydroxyhexyl isobutyrate & x & x & x & \(\alpha\) & & 1848 \\ \hline \end{tabular}
\end{table} 
Table 2: Volatile compounds detected in the skins and juices of Carnona grape samples from Sardinia and calibration equations used for the quantification of the volatile compounds. \begin{table}
\begin{tabular}{c c c c c c c c c} \hline
**Compound** & **Skin F** & **Skin B** & **Juice F** & **Juice B** & **Calibration Equation** & **R\({}^{2}\)** & **Linearity Range (ug/mL)** & **RI** \\ \hline Benzyl alcohol & x & x & x & x & \(y=1.93\times 0.0267\) & 0.9987 & 0.003–0.659 & 1862 \\ Methylmaphhalene (not identified isomer) & x & x & x & \(y=2.02\times 0.0002\) & 0.9986 & 0.003–0.659 & 1862 \\
2-Phenylmethanol & x & x & x & \(y=2.02\times 0.0002\) & 0.9986 & 0.003–2.86 & 1894 \\ Methylmaphhalene (not identified isomer) & x & x & x & \(n_{\rm q}\) & & 1901 \\ Benzyl(thiazolene) & x & x & x & \(n_{\rm q}\) & & 1962 \\ Dimethylmaleene (not identified isomer) & x & x & x & \(n_{\rm q}\) & & 1969 \\ \hline Skin F and Juice F; five compounds from skin and juice, respectively; Skin B and Juice B; glycosylated compounds from skin and juice, respectively RL, experimental linear retention indexes calculated on a WF-Wave column; pg not quantified; “quantified”, “quantified with a calibration curve of a compound of the same chemical class as reported in the “calibration equation” column. & 2004 \\ \hline \end{tabular}
\end{table} 
Table 2: _Cont._A hydrocarbon mixture of n-alkanes (C8-C23) was analyzed separately under the same chromatographic conditions used on the VF-Wax capillary columns to calculate the retention indexes using the generalized equation by [PERSON] and [PERSON] [30].