## 2 Results and Discussion
### GC-MS Analysis of the Volatile Compounds Obtained Using \(Hd\) and HS-SPME
\(\times\)_piperita_ f. _citrata_ 'Grapefruit' (**M2**) and in \(M\). \(\times\)_carinthhaica_ (**M4**), carvone predominated: 62.92% and 72.13%, respectively. _cis_-Dihydrocavrone (26.87%) and dihydrocarvyl acetate (13.01%) were \begin{table}
\begin{tabular}{l c c c c c c c c c} \hline \hline \multirow{2}{*}{**No.**} & \multirow{2}{*}{**Compound**} & \multirow{2}{*}{**RI**} & \multicolumn{8}{c}{**Sample Symbol and Content (\%)**} \\ \cline{3-10}  & & & **RI\({}_{\mathbf{L}}\)** & **M1** & **M2** & **M3** & **M4** & **M5** & **M6** & **M7** \\ \hline
22 & \(p\)-Menthone & 1160 & 1163 & 41.00 & - & - & - & 0.29 & - & - \\
23 & Borneol & 1172 & 1172 & - & - & - & - & - & 1.9 & - \\
24 & Menthol & 1181 & 1181 & 28.19 & - & - & - & - & - & - \\
25 & Terpinen-4-ol & 1182 & 1182 & 0.37 & - & 0.13 & - & - & - & - \\
26 & Isomenthol & 1189 & 1187 & 0.27 & - & - & - & - & - & - \\
27 & Neoisomenthol & 1193 & 1193 & 0.08 & - & - & - & - & - & - \\
28 & \(\alpha\)-Terpineol & 1194 & 1194 & 0.18 & 0.46 & 0.93 & 0.25 & - & - & - \\
29 & Myrtrenal & 1198 & 1196 & 0.13 & - & - & - & - & - & - \\
30 & _cis_-Dihydrocavrone & 1199 & 1195 & - & 0.47 & - & 2.9 & 26.87 & - & - \\
31 & (Z)-Hex-3-enyl pentanoate & 1240 & 1236 & - & - & 0.35 & - & - & - & - \\
32 & Pulegone & 1244 & 1244 & 0.62 & - & - & - & - & - & - \\
33 & Carvone & 1248 & 1249 & - & 62.92 & - & 72.13 & 3.95 & - & - \\
34 & _cis_-Piperitone oxide & 1258 & 1257 & 2.82 & 8.67 & 0.94 & 0.28 & 0.22 & 21.05 & \\
35 & (E)-Citral & 1274 & 1271 & - & - & 0.12 & - & - & - & - \\
36 & Menthyl acetate & 1278 & 1278 & 7.67 & - & - & - & - & - & - \\
37 & Neomenthyl acetate & 1295 & 1296 & - & - & - & - & 0.25 & - & - \\
38 & Thymol & 1299 & 1297 & 0.21 & - & 7.04 & - & 0.32 & - & - \\
39 & Dihydrocavryl acetate & 1333 & 1330 & - & - & - & 0.43 & 13.01 & - & - \\
40 & Piperitene & 1345 & 1347 & - & - & - & - & - & 38.93 & - \\
41 & Eugenol & 1362 & 1359 & 0.07 & - & - & - & - & - & - \\
42 & _cis_-Carvyl acetate & 1367 & 1365 & - & - & - & - & 0.23 & - & - \\
43 & Piperitenone oxide & 1371 & 1371 & - & - & 0.51 & - & - & 32.88 & 84.66 \\
44 & \(\beta\)-Bourbonene & 1386 & 1386 & 0.13 & 0.61 & 0.16 & 0.87 & 0.71 & - & - \\
45 & \(\beta\)-Elemene & 1393 & 1394 & 0.07 & - & - & 0.52 & 1.58 & - & - \\
46 & _cis_-Jasmone & 1399 & 1396 & 0.06 & - & - & - & 0.2 & 0.72 & - \\
47 & \(\alpha\)-Gurjuene & 1411 & 1411 & 0.12 & - & - & - & - & - & - \\
48 & _trans_-Carvophyllene & 1422 & 1423 & 0.48 & 0.92 & 6.73 & 0.95 & 8.21 & 1.17 & 2.83 \\
49 & \(\alpha\)-Humulene & 1456 & 1456 & - & - & 0.28 & - & 0.33 & - & - \\
50 & (E)-\(\beta\)-Farmesene & 1460 & 1460 & 0.44 & - & - & - & - & - & - \\
51 & Germacrene D & 1483 & 1482 & 2.11 & 0.72 & 4.07 & 0.78 & 7.35 & - & 4.54 \\
52 & Sicylogermacene & 1497 & 1499 & 0.6 & - & 0.37 & - & - & - & - \\
53 & \(\delta\)-Cadinene & 1526 & 1524 & 0.05 & - & - & - & - & - & - \\
54 & Elemol & 1557 & 1558 & - & - & - & - & 5.77 & - & - \\
55 & Veridiflorol & 1593 & 1593 & 0.34 & 0.31 & - & 2.76 & - & - \\
56 & \(\beta\)-Eudesmol & 1654 & 1653 & - & - & - & - & 0.56 & - & - \\
57 & \(\alpha\)-Eudesmol & 1657 & 1651 & - & - & - & - & 0.93 & - & - \\
58 & (E)-Phydol & 2113 & 2111 & 0.09 & - & - & - & - & - & - \\ \hline \hline \end{tabular} -, Not detected; RL\({}_{\rm L}\) literature values of retention indices.  
\end{table} 
Table 1: _Cont._found to be the main components in _M. dulcia citreus_ Hillary's Sweet Lemon (**M5**). Carvone as the major component was identified in _M. \(\times\) piperita_ var. _officialis_ f. _pallescens_ Camus (63.31%) (**M1**) and in _M.\(\times\) piperita_ f. _citrata_ (**M3**) (77.61%). [PERSON]'s research also revealed carvone to be the predominant compound in a similar taxon, but HD was performed for the whole herb (stems and leaves) after collection of plant material before flowering [16]. Moreover, [PERSON] et al. reported that, in this taxon, carvone (41.21%) and menthol (12.77%) are the compounds found in the highest amounts [17]. _cis_-Dihydrocavrone was also the predominant component determined in _M.