Table 1.
(a) Percentages in the sample of the main chemical components in Mexican oregano essential oil (Lippia graveolens Kunth) from plants occurring naturally in semiarid areas and cultivated in the field and greenhouse in northern Mexico, analyzed with gas chromatography–mass spectrophotometry. (b) Relative composition of thymol and carvacrol in Mexican oregano essential oil (Lippia graveolens Kunth) from plants occurring naturally in semiarid areas and cultivated in the field and greenhouse in northern Mexico, analyzed with gas chromatography.
| (a) | ||||||
| Num. | TR (min) | Compound Name | Percentage in the Sample (Relative Areas) | |||
| Wild1 | Wild2 | Cfield | CGreenhouse | |||
| 1 | 4.39 | Bicyclo[3.1.0]hexan-3-one, 4-methyl-1-(1-methylethyl)- | 0.31 | 0.32 | 0.39 | 0.41 |
| 2 | 4.70 | Tricyclo[2.2.1.0(2,6)]heptane, 1,3,3-trimethyl- | 0.43 | 0.47 | 0.42 | 0.42 |
| 3 | 5.08 | Beta-myrcene | 4.40 | 4.50 | 4.50 | 4.50 |
| 4 | 5.37 | (+)-4-Carene | 1.87 | 1.89 | 2.01 | 1.90 |
| 5 | 5.46 | o-Cymene | 13.42 | 13.24 | 11.90 | 12.50 |
| 6 | 5.51 | d-Limonene | 1.50 | 1.60 | 1.60 | 1.90 |
| 7 | 5.54 | Eucalyptol | 1.66 | 1.65 | 2.01 | 1.50 |
| 8 | 5.83 | Gamma-Terpine | 6.23 | 7.10 | 6.70 | 6.41 |
| 9 | 5.91 | Bicyclo[3.1.0]hexan-2-ol, 2-methyl-5-(1-methylethyl)-, (1α,2β,5α)- | 0.20 | 0.21 | 0.31 | 0.30 |
| 10 | 6.14 | cyclohexane 1-methyl-4-(1-methylethylidene)- | 0.26 | 0.31 | 0.28 | 0.27 |
| 11 | 6.24 | Linalool | 0.95 | 0.98 | 1.02 | 1.02 |
| 12 | 7.06 | 3-cyclohexen-1-ol 4-methyl-1-(1-methylethyl)- (r)- | 1.79 | 1.80 | 2.01 | 1.84 |
| 13 | 7.22 | Alpha-terpineol | 0.27 | 0.30 | 0.29 | 0.28 |
| 14 | 7.59 | Benzene 2-methoxy-4-methyl-1-(1-methylethyl)- | 0.16 | 0.17 | 0.17 | 0.15 |
| 15 | 8.16 | Thymol | 8.90 | 6.90 | 1.90 | 13.90 |
| 16 | 8.23 | Carvacrol | 16.60 | 14.10 | 16.20 | 25.20 |
| 17 | 8.74 | Eugenol | 0.31 | 0.42 | 0.33 | 0.32 |
| 18 | 9.38 | Caryophyllene | 4.83 | 5.01 | 5.01 | 4.90 |
| 19 | 9.46 | cis-alpha-bergamotene | 1.14 | 1.10 | 2.00 | 1.20 |
| 20 | 9.66 | Humulene | 2.32 | 2.33 | 3.14 | 3.01 |
| 21 | 9.79 | Phenol, 3-(1,1-dimethylethyl)-4-methoxy | 0.41 | 0.39 | 0.51 | 0.42 |
| 22 | 10.06 | β-Bisabolene | 0.20 | 0.30 | 0.22 | 0.21 |
| 23 | 10.72 | Caryophyllene oxide | 0.76 | 0.79 | 0.79 | 0.78 |
| 24 | 10.92 | (1R,3E,7E,11R)-1,5,5,8-Tetramethyl-12-oxabicyclo[9.1.0]dodeca-3,7-diene | 0.28 | 0.26 | 0.30 | 0.28 |
| (b) | ||||||
| Site | Thymol (%) | Carvacrol (%) | ||||
| Wild1 | 8.4 ± 1.02 ab | 16.4 ± 1.30 ab | ||||
| Wild2 | 6.6 ± 0.99 b | 13.8 ± 1.83 ab | ||||
| CField | 1.7 ± 0.04 c | 15.7 ± 1.06 ab | ||||
| CGreenhouse | 14.1 ± 1.680 a | 25.7 ± 2.02 a | ||||
a,b,c Different lowercase letters represent significant differences (p < 0.05) between sites.