Table 1. Chemical composition of Monarda didyma essential oil (EO) by GC-FID (Method A).
The Retention time of the peaks of the different standards analysed (Ret. Time Standard) and those of the corresponding peaks present in the essential oil spectrum (Ret. Time EO) are indicated. The relative areas (%) of the GC-FID chromatogram peaks are also shown. In bold the most abundant components and their relative areas (>2.5%). The ‘Ret. Time EO’ represents the mean retention time of two repetitions of essential oil samples (concentration level 100%) analyzed on three consecutive days.
| Compounds | Relative area (%) | Ret. Time EO (min) |
Ret. Time Standard (min) |
|---|---|---|---|
| α-Pinene | 0.7 | 10.097 | 10.143 |
| Camphene | 0.3 | 10.607 | 10.621 |
| β-Pinene | — | — | 11.684 |
| 1-Octen-3-ol | 5.5 | 11.690 | 11.810 |
| β-Myrcene | 2.1 | 12.132 | 12.169 |
| δ-2-Carene | — | — | 12.573 |
| α-Phellandrene | 0.3 | 12.673 | 12.739 |
| δ-3-Carene | 0.1 | 12.916 | — |
| α-Terpinene | 2.7 | 13.177 | 13.281 |
| p-Cymene | 19.3 | 13.521 | 13.616 |
| D-Limonene | 1.5 | 13.689 | 13.766 |
| Eucalyptol | 0.8 | 13.830 | 13.809 |
| γ-Terpinene | 8.8 | 15.026 | 15.071 |
| α-Terpinolene | 0.3 | 16.413 | 16.528 |
| Linalool | 2.6 | 16.976 | 17.141 |
| α-Terpineol | 0.5 | 21.773 | 22.006 |
| Thymol Methyl Ether | 5.2 | 24.092 | 24.108 |
| Carvacrol Methyl Ether | 6.4 | 24.411 | 24.436 |
| Thymol | 12.3 | 25.576 | 25.633 |
| Carvacrol | 19.5 | 25.753 | 25.754 |