TABLE 2.
Compounds identified in oregano essential oil and their characteristics such as vapor pressure, water solubility, and log Kow
| Compound, molecular formula (molar mass [g/mol]) | % in oregano oil | Molecular structure | Vapor pressure (mm Hg) (at 25°C) | Solubility in water (mg/L) (at 25°C), solubility category | Log Kow |
|---|---|---|---|---|---|
| Carvacrol, C10H14O (150.217) | 36.97 |
|
0.029 | 1,250, high | 3.49 |
| Thymol, C10H14O (150.22) | 21.44 |
|
0.038 | 900, moderate | 3.30 |
| p-Cymene, C10H14 (134.21) | 15.27 |
|
1.50 | 23.4, moderate | 4.10 |
| γ-Terpinene, C10H16 (136.23) | 13.35 |
|
1.1 | 8.68, low | 4.36 |
| α-Terpinene, C10H16 (136.23) | 2.04 |
|
1.66 | 5.915, low | 4.53 |
| α-Caryophyllene, C15H24 | 1.97 |
|
0.008 | 0.014, low | 6.59 |
| Linalool, C10H18O (204.35) | 1.55 |
|
0.16 | 1,590, high | 2.97 |
| Myrcene, C10H16 (136.23) | 1.39 |
|
2.29 | 5.6, low | 4.17 |
| α-Thujene, C10H16 (136.238) | 0.89 |
|
4.77 | 2.91, low | 4.02 |
| α-Pinene, C10H16 (136.24) | 0.66 |
|
4.75 | 2.49, low | 4.83 |
| Terpinen-4-ol, C10H18O (154.25) | 0.63 |
|
0.048 | 386.6, moderate | 3.26 |
| Limonene, C10H16 (136.24) | 0.55 |
|
1.54 | 4.58, low | 4.38 |