## 2 Results
\begin{table}
\begin{tabular}{c c c c c c} \hline \hline
**Compound** & **LRI** & **ID**\({}^{\#}\) & **Aroma** & **Area** & **Ref** \\ \hline Ethyl butanoate & 869 & A, B, C & Fruity & \(0.8\pm 0.1\) & [10,22,24,31] \\ \hline Ethyl 2-methyl-Butanoate & 926 & A, B & Fruity & \(1.0\pm 0.1\) & [31] \\ \hline Ethyl 3-hydroxy-Butanoate & 1019 & A, B, C & - & \(1.2\pm 0.1\) & - \\ \hline
1-Butanol,3-methyl-, propanoate & 1061 & A, B & - & \(0.62\)\({}^{\text{a}}\) & - \\ \hline Ethyl 2,3-epoxybutyrate & 1098 & A, B & - & \(1.4\pm 0.1\) & [23] \\ \hline
2,3-Butanediol diacetate & 1121 & A, B &
\begin{tabular}{c} Earthy, soil-like \\ odor \\ \end{tabular} & \(2.2\pm 0.1\) & [24,28] \\ \hline
2,3-Butanediol diacetate & 1134 & A, B &
\begin{tabular}{c} Earthy, soil-like \\ odor \\ \end{tabular} & \(2.2\pm 0.1\) & [24,28] \\ \hline \hline \multicolumn{4}{l}{_Ketones_} \\ \hline Acetone & 454 & A, B & Solvent, ethereal & \(0.46\)\({}^{\text{a}}\) & [30] \\ \hline
2,3-Butanedione & 582 & A, B &
\begin{tabular}{c} Battery, sweet, \\ creamy \\ \end{tabular} & \(7.9\pm 0.3\) & [31,33] \\ \hline
2-Pentanone & 590 & A, B &
\begin{tabular}{c} Sweet, fruity, \\ ethereal \\ \end{tabular} & \(0.58\)\({}^{\text{a}}\) & - \\ \hline
1-hydroxy-2-Propanone & 691 & A, B &
\begin{tabular}{c} Sweet, \\ caramel-like \\ \end{tabular} & \(0.8\pm 0.1\) & - \\ \hline
2,3-Pentanedione & 735 & A, B &
\begin{tabular}{c} Battery, sweet, \\ caramel-like \\ \end{tabular} & \(2.1\pm 0.1\) & [19,31,33] \\ \hline
3-hydroxy-2-Butanone (Acetoin) & 755 & A, B, C &
\begin{tabular}{c} Acid, yogurt, \\ creamy, fruity \\ \end{tabular} & \(6.4\pm 0.2\) & [22,29] \\ \hline
3-Penten-2-one & 795 & A, B & Fruity & \(3.2\pm 0.2\) & - \\ \hline
4-hydroxy-5-methyl-2-Hexanone & 964 & A, B & - & \(0.30\)\({}^{\text{a}}\) & - \\ \hline \multicolumn{4}{l}{_Ketones (Continued)_} \\ \hline
6-methyl-5-Hepten-2-one & 1070 & A, B &
\begin{tabular}{c} Citrus, green, \\ fruity \\ \end{tabular} & \(1.0\pm 0.1\) & [10,20,29] \\ \hline
3,5-Octadien-2-one & 1155 & A, B & \begin{tabular}{c} Fruity, fatty, \\ mushroom \\ \end{tabular} & \(0.62\)\({}^{\text{a}}\) & [24,29,31] \\ \hline Geranylacetone & 1484 & A, B & \begin{tabular}{c} Floral, fresh, green \\ \end{tabular} & \(0.27\)\({}^{\text{a}}\) & [10,31] \\ \hline \multicolumn{4}{l}{_Acids_} \\ \hline Acetic acid & 571 & A, B & \
\begin{tabular}{c} Sour, pungent \\ \end{tabular} & \(5.3\pm 0.2\) & [22,29,31] \\ \hline Propanoic acid & 709 & A, B &
\begin{tabular}{c} Pungent, acidic \\ \end{tabular} & \(1.1\)\({}^{\text{a}}\) & [33] \\ \hline
2-methyl-Propanoic acid & 793 & A, B & Acidic, sour & \(0.50\)\({}^{\text{a}}\) & [19] \\ \hline
3-methyl-Butanoic acid & 897 & A, B &
\begin{tabular}{c} Sour, cheesy \\ \end{tabular} & \(1.3\pm 0.1\) & - \\ \hline
2-methyl-Butanoic acid & 909 & A, B, C & Cheesy & \(2.1\pm 0.1\) & [22,31] \\ \hline
2-Hydroxy-2-methylbutyric acid & 958 & A, B & - & \(3.5\pm 0.2\) & - \\ \hline Hexanoic acid & 1040 & A, B & \
\begin{tabular}{c} Sour, fatty, \\ sweet, cheesy \\ \end{tabular} & \(1.8\pm 0.1\) & [33] \\ \hline Nonanoic acid & 1312 & A, B &
\begin{tabular}{c} Waxy, cheesy, dairy \\ \end{tabular} & \(0.34\)\({}^{\text{a}}\) & [10] \\ \hline \hline \end{tabular}
\end{table} 
Table 1: _Cont._From Table 1, in the M_AI_V_t\({}_{0}\) sample, 81 compounds are detected, including 19 aldehydes (ALD); 21 alcohols (ALC); 9 esters, among which 5 were non-acetate esters (NAE) and 4 were acetate ones (ACE); 11 ketones (KET); 8 acids (ACD); 2 alkanes (AHA); 6 sulfur-derived compounds (SDC); and 5 other compounds (OTH). Figure 3 shows the HS-SPME chromatogram related to the oven-dried bleached fiber from the winter melon pomace (M_B_O_t\({}_{0}\)). These specimens were immediately processed with the GC-MS instrumentation described in Section 4. At first sight, the comparison between the chromatograms in Figures 2 and 3 shows a lower number of peaks for the sample that was bleached and oven dried. Evidently the bleaching process and the washing steps remove significant quantities of some volatiles.