## 3 Results and Discussion
### Terpenes and Derivatives
\begin{table}
\begin{tabular}{c c c c c c} \hline  & & **WDF\_t\({}_{0}\)** & **WDF\_t\({}_{1}\)** & **WDF\_t\({}_{2}\)** & \\ \hline
**Analyte** & **Aroma** & **LRI** & **Area (\(\times 10^{6}\))** & **Area (\(\times 10^{6}\))** & **Area (\(\times 10^{6}\))** & **Ref** \\ \hline
4,5-Dimethyl nonane & - & 1159 & _7.77_\(\pm\) 0.07 & & - \\ \hline Octadecane & - & 1170 & 3.44 \({}^{\text{a}}\) & - & - & [26, 32, 41] \\ \hline Tetradecane & Waxy, soft & 1204 & 2.20 \({}^{\text{a}}\) & 40.8 \(\pm\) 0.2 & - & [26, 41] \\ \hline
1-Tridecene & - & 1248 & 24.5 \(\pm\) 0.3 & 9.63 \(\pm\) 0.06 & - & - \\ \hline Heicosane & Waxy & 1256 & 1.82 \({}^{\text{a}}\) & - & - & [41] \\ \hline Heneicosane & Waxy & 1279 & 1.77 \({}^{\text{a}}\) & - & - & [32, 41] \\ \hline \end{tabular} \({}^{\text{a}}\) SD \(<\) 0.05. LRI = Linear Retention Index.  
\end{table} 
Table 6: _Cont._Monoterpenes and monoterpenoids were identified in WDF_t\({}_{0}\) only. After 30 days, these volatile analytes were not detected probably because they underwent degradation. HS-SPME-GC-MS analysis highlighted the presence of limonene in an unexpected and positive way. This analyte is one of the characteristic constituents of the citrus family but has also been found in other fruits, including watermelon [6, 10, 26]. It is a particularly sought-after molecule, appreciated in the food, cosmetic, and soap industries, as it provides \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline  & & **WDF\_t\({}_{0}\)** & **WDF\_t\({}_{1}\)** & **WDF\_t\({}_{2}\)** & \\ \hline \hline
**Analyte** & **Aroma** & **LRI** & **Area (\(\times\)10\({}^{\text{e}}\))** & **Area (\(\times\)10\({}^{\text{e}}\))** & **Area (\(\times\)10\({}^{\text{e}}\))** & **Ref** \\ \hline
6-Methyl-5-hepten-2-one & Fruity, apple, moldy, cream & 940 & 810 \(\pm\) 0.6 & 240 \(\pm\) 0.6 & 236 \(\pm\) 0.3 & [2, 4, 6, 26] \\ \hline \(\beta\)-Terpinene & - & 944 & 22.8 \(\pm\) 0.2 & - & - & [41] \\ \hline Isoteriphenene & - & 693 & - & - & 3.99  & - & - & [41] \\ \hline Cymene & \begin{tabular}{c} Bitter, woody, terpenic, \\ citrus \\ \end{tabular} & 979 & 10.5 \(\pm\) 0.07 & - & - & [50] \\ \hline Limonene & Citrus, orange, sweet, fresh & 984 & 1330 \(\pm\) 0.8 & - & - & [6, 10, 26, 41] \\ \hline \begin{tabular}{c} 2,2,6-Trimethyl- \\ cyclohexanone \\ \end{tabular} & \begin{tabular}{c} Pungent, honey \\ \end{tabular} & 989 & - & - & \(21.0\pm 0.2\) & [4] \\ \hline Citronellol & \begin{tabular}{c} Floral, rose, sweet, citrus \\ \end{tabular} & 990 & 37.8 \(\pm\) 0.1 & 13.3 \(\pm\) 0.2 & - & - \\ \hline Linalool oxide & \begin{tabular}{c} Woody, nuance, floral, green \\ \end{tabular} & 1010 & 5.18  & - & - & [41] \\ \hline \(5\)-Isopropenyl-2- & \begin{tabular}{c} methylcyclopent-1- \\ encarboxaldehyde \\ \end{tabular} & - & 1106 & 16.9 \(\pm\) 0.2 & 18.2 \(\pm\) 0.1 & - & - \\ \hline \(2\),3-Epoxygeranial & - & 1110 & 61.0 \(\pm\) 0.3 & 40.9 \(\pm\) 0.3 & - & [4, 25] \\ \hline \(\beta\)-Cyclocitral & \begin{tabular}{c} Saffron, tropical, grass, rose \\ \end{tabular} & 1116 & - & - & - & 3.32  & - & - & [41] \\ \hline Isopulegol & \begin{tabular}{c} Mint, refreshing, woody, \\ grass \\ \end{tabular} & 1154 & 8.34 \(\pm\) 0.06 & - & - & - \\ \hline Isocitral & - & 1180 & 2.23  & - & - & - \\ \hline Geranylacetone & \begin{tabular}{c} Rose, fresh, leaf, floral, \\ green \\ \end{tabular} & 1237 & 181 \(\pm\) 0.5 & 104 \(\pm\) 0.5 & 2.36  & [27, 32, 41] \\ \hline \(5\)-\(6\)-\(\beta\)-Ionone epoxide & \begin{tabular}{c} Fruity, sweet, woody, violet \\ \end{tabular} & 1269 & 5.78  & [31, 32, 33] \\ \hline Carvone oxide & \
\begin{tabular}{c} Mint, green \\ \end{tabular} & 1298 & - & 4.26  & - & - \\ \hline Dihydroactinidiolide &
\begin{tabular}{c} Apricot, red fruit, wood \\ \end{tabular} & 1309 & 7.65 \(\pm\) 0.07 & 44.7 \(\pm\) 0.1 & 22.0 \(\pm\) 0.1 & [4, 41, 48] \\ \hline \hline \end{tabular}
\end{table} 
Table 7: Composition of the VOC fraction of Gavina® watermelon pomace WDF identified using HS-SPME-GC-MS analysis: terpenes and derivatives class. a very pleasant citrus and fresh fragrance.