## 3 Results
### Changes in Volatile Compounds Profile Induced by DBD Plasma
\begin{table}
\begin{tabular}{l c c c c c c c} \hline  & \multirow{2}{*}{**Control**} & \multicolumn{6}{c}{**Dielectric Barrier Discharge Plasma Conditions (Frequency and Time)**} \\ \cline{3-8}  & & **50 Hz** & **50 Hz** & **500 Hz** & **500 Hz** & **1000 Hz** & **1000 Hz** \\  & & **10 min** & **20 min** & **10 min** & **20 min** & **10 min** & **20 min** \\ \hline Ethyl acetate & 3.48 \(\pm\) 0.18 & 5.10 \(\pm\) 0.20 & 6.95 \(\pm\) 0.28 & 5.95 \(\pm\) 0.24 & 2.31 \(\pm\) 0.09 & 12.14 \(\pm\) 0.49 & 12.20 \(\pm\) 0.49 \\ Methyl lutanoate & 1.70 \(\pm\) 0.09 & 4.52 \(\pm\) 0.18 & 0.81 \(\pm\) 0.03 & 5.27 \(\pm\) 0.21 & 1.02 \(\pm\) 0.04 & 1.38 \(\pm\) 0.06 & 0.79 \(\pm\) 0.03 \\ Methyl2-methyl & 7.84 \(\pm\) 0.40 & 8.32 \(\pm\) 0.33 & 3.70 \(\pm\) 0.15 & 9.70 \(\pm\) 0.39 & 9.81 \(\pm\) 0.30 & 9.75 \(\pm\) 0.39 & 5.14 \(\pm\) 0.21 \\ Ethyl 2-methyl & & & & & & & \\ butanoate & 1.54 \(\pm\) 0.08 & 1.82 \(\pm\) 0.07 & 1.17 \(\pm\) 0.05 & 2.13 \(\pm\) 0.09 & 1.66 \(\pm\) 0.07 & 2.09 \(\pm\) 0.08 & 1.22 \(\pm\) 0.05 \\ Methyl hexanoate & 53.16 \(\pm\) 2.68 & 23.91 \(\pm\) 0.96 & 11.65 \(\pm\) 0.47 & 27.88 \(\pm\) 1.12 & 27.53 \(\pm\) 1.10 & 28.69 \(\pm\) 1.15 & 18.68 \(\pm\) 0.75 \\ Ethyl hexanoate & 10.00 \(\pm\) 0.50 & 6.45 \(\pm\) 0.26 & 1.98 \(\pm\) 0.08 & 7.52 \(\pm\) 0.30 & 8.33 \(\pm\) 0.33 & 8.64 \(\pm\) 0.35 & 8.42 \(\pm\) 0.34 \\ Methyl3-(methylthio) & 12.55 \(\pm\) 0.63 & 16.14 \(\pm\) 0.65 & 38.29 \(\pm\) 1.53 & 18.82 \(\pm\) 0.75 & 21.39 \(\pm\) 0.86 & 16.97 \(\pm\) 0.68 & 21.06 \(\pm\) 0.84 \\ Ethyl 3-(methylthio) & 2.28 \(\pm\) 0.04 & 3.71 \(\pm\) 0.15 & 8.31 \(\pm\) 0.33 & 4.33 \(\pm\) 0.17 & 5.09 \(\pm\) 0.20 & 4.36 \(\pm\) 0.17 & 6.27 \(\pm\) 0.25 \\ Methyl octanoate & 2.44 \(\pm\) 0.11 & 0.42 \(\pm\) 0.02 & 0.00 \(\pm\) 0.00 & 0.49 \(\pm\) 0.00 & 0.42 \(\pm\) 0.02 & 0.29 \(\pm\) 0.01 & 0.24 \(\pm\) 0.01 \\
1.3.5-Undecatriene & 0.56 \(\pm\) 0.04 & 0.45 \(\pm\) 0.02 & 0.00 \(\pm\) 0.00 & 0.52 \(\pm\) 0.00 & 1.49 \(\pm\) 0.06 & 1.71 \(\pm\) 0.07 & 1.07 \(\pm\) 0.04 \\ Octanoic acid & 0.03 \(\pm\) 0.01 & 0.47 \(\pm\) 0.02 & 1.43 \(\pm\) 0.06 & 0.54 \(\pm\) 0.02 & 1.06 \(\pm\) 0.04 & 1.12 \(\pm\) 0.04 & 1.68 \(\pm\) 0.07 \\ Ethyl octanoate & 0.07 \(\pm\) 0.01 & 1.71 \(\pm\) 0.07 & 0.14 \(\pm\) 0.01 & 2.00 \(\pm\) 0.02 & 1.27 \(\pm\) 0.05 & 0.85 \(\pm\) 0.03 & 0.28 \(\pm\) 0.01 \\ Decanal & 0.00 \(\pm\) 0.00 & 0.00 \(\pm\) 0.00 & 0.94 \(\pm\) 0.04 & 0.00 \(\pm\) 0.00 & 1.79 \(\pm\) 0.07 & 0.00 \(\pm\) 0.00 & 0.00 \(\pm\) 0.00 \\
5-Hydroymethyl- & 0.00 \(\pm\) 0.00 & 0.00 \(\pm\) 0.00 & 0.00 \(\pm\) 0.00 & 0.00 \(\pm\) 0.00 & 0.66 \(\pm\) 0.03 & 0.00 \(\pm\) 0.00 & 0.11 \(\pm\) 0.01 \\
2-furaldehyde & 0.17 \(\pm\) 0.01 & 0.62 \(\pm\) 0.02 & 0.99 \(\pm\) 0.04 & 0.72 \(\pm\) 0.03 & 0.88 \(\pm\) 0.04 & 0.66 \(\pm\) 0.03 & 1.19 \(\pm\) 0.05 \\
5-Butyldihydro- & 0.17 \(\pm\) 0.01 & 0.44 \(\pm\) 0.02 & 0.91 \(\pm\) 0.04 & 0.51 \(\pm\) 0.02 & 0.60 \(\pm\) 0.02 & 0.48 \(\pm\) 0.02 & 0.74 \(\pm\) 0.03 \\ Methyl linoleate & 0.98 \(\pm\) 0.01 & 1.42 \(\pm\) 0.06 & 2.18 \(\pm\) 0.09 & 1.66 \(\pm\) 0.07 & 1.72 \(\pm\) 0.07 & 1.56 \(\pm\) 0.06 & 1.42 \(\pm\) 0.03 \\ \hline \end{tabular}
\end{table} 
Table 1: Mass fraction of volatile compounds (% _w/w_) of pineapple juice subjected to dielectric barrier discharge plasma under different operating conditions. Number of replicates = 3. Figure 1: Plasma-induced reactions in ester (**a**) and thioester (**b**) compounds from pineapple aroma.