Table 2.
Chemical composition of T. serpyllum and T. vulgaris essential oils (EOs) (%).
| Peak No. | Compounds | RI a | T. vulgaris | T. serpyllum |
|---|---|---|---|---|
| Monoterpene Hydrocarbons | 10.84 | 25.4 | ||
| 1. | α-Pinene | 937 | 1.51 | 0.18 |
| 2. | Camphene | 952 | 1.67 | 0.19 |
| 3. | β-Pinene | 978 | 0.21 | 2.15 |
| 4. | β-Myrcene | 991 | 1.64 | 0.28 |
| 5. | α-Phellandrene | 1005 | 0.11 | 0.08 |
| 6. | α-Terpinene | 1017 | 0.87 | 0.13 |
| 8. | Limonene | 1030 | 1.71 | 0.21 |
| 12. | γ-Terpinene | 1060 | 3.12 | 22.18 |
| Aromatic Monoterpene Hydrocarbons | 23.83 | 16.66 | ||
| 7. | p-Cymene | 1025 | 23.83 | 16.66 |
| Oxygenated Monoterpenes | 7.19 | 2.05 | ||
| 9. | 1,8-Cineole | 1032 | 0.93 | 0.16 |
| 10. | Linalool | 1099 | 2.55 | 0 |
| 11. | Camphor | 1145 | 0.33 | 0.77 |
| 13. | endo-Borneol | 1167 | 1.68 | 0 |
| 14. | Terpinen-4-ol | 1177 | 1.42 | 0.07 |
| 15. | Isomenthol | 1183 | 0 | 0.84 |
| 16. | α-Terpineol | 1189 | 0.23 | 0.03 |
| 19. | Bornyl acetate | 1285 | 0.05 | 0.07 |
| 26. | trans-β-Ionone | 1486 | 0 | 0.11 |
| Aromatic Oxygenated Monoterpenes | 51.49 | 54.98 | ||
| 17. | Isothymol methyl ether | 1230 | 0.92 | 0 |
| 18. | Thymol methyl ether | 1235 | 1.49 | 0 |
| 20. | Thymol | 1291 | 45.22 | 54.17 |
| 21. | Carvacrol | 1299 | 3.86 | 0.81 |
| Sesquiterpene Hydrocarbons | 4.91 | 0.2 | ||
| 22. | α-Cubebene | 1351 | 0.08 | 0 |
| 23. | β-Cubenene | 1388 | 0.03 | 0 |
| 24. | trans-β-Caryophyllene | 1419 | 4.04 | 0.12 |
| 25. | Humulene | 1454 | 0.41 | 0.08 |
| 27. | δ-Cadinene | 1524 | 0.35 | 0 |
| Oxygenated Sesquiterpenes | 0.94 | 0 | ||
| 28. | Caryophyllene oxide | 1581 | 0.94 | 0 |
| Total of identified compounds (%) | 99.2 | 99.29 | ||
a Retention indices (RI) relative to C9–C24 n-alkanes on the HP 5MS column.