Table 1.
Chemical composition of the essential oils from the selected Mentha species.
| No. | Compound | RIlit a | RIcal b | % in EOMPA c | % in EOMSP d | % in EOMSU e |
|---|---|---|---|---|---|---|
| 1 | alpha-pinene | 939 | 950 | 0.133 ± 0.03 | 0.220 ± 0.05 | 0.791 ± 0.12 |
| 2 | sabinene | 971 | 980 | 0.071 ± 0.00 | 0.136 ± 0.03 | 0.342 ± 0.08 |
| 3 | beta-pinene | 976 | 983 | 0.232 ± 0.04 | 0.471 ± 0.19 | 1.497 ± 0.42 |
| 4 | myrcene | 990 | 994 | 0.119 ± 0.02 | 0.095 ± 0.00 | 0.462 ± 0.11 |
| 5 | 2-octanol | 997 | 997 | 0.617 ± 0.18 | 0.201 ± 0.06 | 0.305 ± 0.07 |
| 6 | para-cymene | 1022 | 1025 | 0.292 ± 0.11 | 0.140 ± 0.02 | 0.230 ± 0.05 |
| 7 | limonene | 1027 | 1028 | 0.346 ± 0.09 | 1.569 ± 0.48 | 2.969 ± 1.02 |
| 8 | 1,8-cineole | 1029 | 1031 | 1.587 ± 0.64 | 2.567 ± 0.69 | 0.118 ± 0.04 |
| 9 | gamma-terpinene | 1057 | 1058 | 0.407 ± 0.05 | 0.106 ± 0.00 | - |
| 10 | menthone | 1151 | 1155 | 15.742 ± 2.73 | 7.225 ± 1.81 | - |
| 11 | isomenthone | 1162 | 1165 | 7.735 ± 2.03 | 3.325 ± 0.82 | - |
| 12 | menthol | 1170 | 1177 | 39.695 ± 3.26 | 12.774 ± 2.48 | 0.128 ± 0.03 |
| 13 | terpineol 4 | 1175 | 1179 | 2.182 ± 0.55 | 1.221 ± 0.33 | 0.679 ± 0.19 |
| 14 | isomenthol | 1181 | 1184 | 0.493 ± 0.14 | 0.192 ± 0.04 | - |
| 15 | alpha-terpineol | 1188 | 1191 | 0.449 ± 0.17 | 0.622 ± 0.21 | 0.246 ± 0.04 |
| 16 | dihydrocarveol | 1192 | 1195 | 0.120 ± 0.02 | 1.120 ± 0.24 | - |
| 17 | estragole | 1195 | 1199 | 0.929 ± 0.18 | - | - |
| 18 | trans-carveol | 1216 | 1219 | 0.085 ± 0.00 | 1.113 ± 0.47 | - |
| 19 | cis-carveol | 1228 | 1232 | - | 1.221 ± 0.31 | - |
| 20 | pulegone | 1235 | 1239 | 2.140 ± 0.80 | 3.763 ± 1.04 | - |
| 21 | carvone | 1240 | 1244 | 2.377 ± 0.73 | 41.215 ± 4.18 | 1.555 ± 0.44 |
| 22 | piperitone | 1250 | 1254 | 2.096 ± 0.75 | 0.647 ± 0.13 | 0.340 ± 0.08 |
| 23 | neomenthyl acetate | 1274 | 1276 | 0.135 ± 0.02 | 0.101 ± 0.00 | - |
| 24 | trans-anethole | 1282 | 1286 | 5.374 ± 0.94 | 0.113 ± 0.02 | - |
| 25 | menthyl-acetate | 1294 | 1295 | 3.022 ± 1.21 | 1.912 ± 0.89 | - |
| 26 | menthylcamphor | - | 1300 | 0.478 ± 0.17 | 0.497 ± 0.12 | 0.498 ± 0.15 |
| 27 | eugenol | 1354 | 1357 | 0.214 ± 0.05 | 0.184 ± 0.03 | - |
| 28 | piperitenone oxide | 1366 | 1366 | - | - | 73.773 ± 6.41 |
| 29 | beta-bourbonene | 1383 | 1384 | 0.222 ± 0.04 | 0.951 ± 0.27 | 0.293 ± 0.05 |
| 30 | cis-jasmone | 1395 | 1399 | - | - | 2.124 ± 0.65 |
| 31 | caryophyllene | 1418 | 1418 | 0.112 ± 0.03 | 2.289 ± 0.99 | 0.604 ± 0.23 |
| 32 | germacrene-d | 1479 | 1480 | - | - | 3.309 ± 1.19 |
| 33 | viridoflorol | 1592 | 1590 | - | - | 1.455 ± 0.68 |
a Retention indices from literature. b Calculated retention indices. c EOMPA: essential oil from M. piperita pallescens. d EOMSP: essential oil from M. spicata. e EOMSU: essential oil from M. suaveolens. Relative proportions are expressed as mean ± SD of three GC-MS analysis of each sample.