## 3 Results and Discussion
### Modifications in the Volatile Profile
\begin{table}
\begin{tabular}{l c c c c c c c c c c c c} \hline \hline  & \multicolumn{2}{c}{**Control**} & \multicolumn{2}{c}{**Plasma**} & \multicolumn{2}{c}{**Plasma**} & \multicolumn{2}{c}{**Plasma**} & \multicolumn{2}{c}{**Plasma**} & \multicolumn{2}{c}{**Plasma**} & \multicolumn{2}{c}{**Plasma**} & \multicolumn{2}{c}{**Plasma**} & \multicolumn{2}{c}{**Plasma**} \\ \multicolumn{2}{c}{**Compound**} & \multicolumn{2}{c}{**Sample**} & \multicolumn{2}{c}{**Treatment**} & \multicolumn{2}{c}{**Treatment**} & \multicolumn{2}{c}{**Treatment**} & \multicolumn{2}{c}{**Treatment**} & \multicolumn{2}{c}{**Treatment**} & \multicolumn{2}{c}{**Treatment**} & \multicolumn{2}{c}{**Treatment**} & \multicolumn{2}{c}{**Treatment**} & \multicolumn{2}{c}{**Treatment**} & \multicolumn{2}{c}{**Treatment**} \\ \multicolumn{2}{c}{**Compound**} & \multicolumn{2}{c}{**Sample**} & \multicolumn{2}{c}{**10 min**} & \multicolumn{2}{c}{**10 min**} & \multicolumn{2}{c}{**10 min**} & \multicolumn{2}{c}{**10 min**} & \multicolumn{2}{c}{**20 min**} & \multicolumn{2}{c}{**10 min**} & \multicolumn{2}{c}{**20 min**} & \multicolumn{2}{c}{**10 min**} & \multicolumn{2}{c}{**30 min**} & \multicolumn{2}{c}{**10 min**} & \multicolumn{2}{c}{**30 min**} \\  & \multicolumn{2}{c}{**10 min**} & \multicolumn{2}{c}{**20 min**} & \multicolumn{2}{c}{**30 min**} & \multicolumn{2}{c}{**10 min**} & \multicolumn{2}{c}{**20 min**} & \multicolumn{2}{c}{**10 min**} & \multicolumn{2}{c}{**20 min**} & \multicolumn{2}{c}{**10 min**} & \multicolumn{2}{c}{**20 min**} & \multicolumn{2}{c}{**30 min**} \\ \hline
3-Amino2-3-DBA & 0.03 \(\pm\)0.1\({}^{\circ}\) & 0.03 \(\pm\)0.01\({}^{\circ}\) & 0.02 \(\pm\)0.04\({}^{\circ}\) & 0.06 \(\pm\)0.01\({}^{\circ}\) & 0.03 \(\pm\)0.01\({}^{\circ}\) & 0.02 \(\pm\)0.01\({}^{\circ}\) & 0. Figure 2 shows a heat map showing the changes in the mass fraction of the volatile components with the untreated juice as a basis for comparison. Darker colors indicate changes above 50% in the component's mass fraction, and lighter colors indicate changes below 50%. The changes observed in the limonene content were lower than 3%, which could be understood as a minor change. However, limonene is converted into compounds with a much lower odor threshold; thus, it makes a much higher contribution to odor perception. Therefore, even though the changes induced by the plasma treatment were small, these changes had a significant impact on odor perception in terms of the volatile compound profile. The changes in odor perception are presented and discussed in Section 3.3 (Modifications in the Aroma Profile). A heat map analysis shows a significant variation in the intensity of the changes induced by the glow discharge plasma. Overall, the treatments carried out for 30 min at 20 mL/min and 20 min at 10 mL/min and 30 mL/min presented bigger changes. The mass fraction of limonene, terpinolene, \(\gamma\)-terpinene, and 3-carene consistently decreased after plasma application. The contents of \(\beta\)-pinene and p-cymene also presented a greater tendency to decrease. However, the concentration of \(\alpha\)-pinene, camphene, p-mentha-2,8-dienol, decanal, perillaldehyde, p-mentha-6,8-diene-2-hydroperoxide, dodecanal, germacrene D, and eremophila-1(10),11-diene showed a tendency to increase after plasma treatment. The analysis of the glow plasma systems and their effects on products can be complicated because one can analyze the plasma flow rate, residence time, and fluence, where fluence is defined as the product of the flow rate and residence time (\(\rm{F}\times\rm{t}_{R}\)), by measuring the accumulated amount of plasma species that came in contact with the sample. Another point is the flow rate. Higher flow rates do not necessarily mean that more of the same plasma species will act in the system. As the same electrical potential difference is applied to a higher flow rate of gas, different plasma species will be produced with different outcomes for the product.