Table 1.
Volatile composition of the fruit essential oil of Ferula drudeana.
| No. | RRI a | RRI b | Molecular Formula/MW | Compound Name | Peak Area (%) | IM |
|---|---|---|---|---|---|---|
| 1 | 1032 | 1032 c, 1008–1039 d | C10H16/136 | α-Pinene | 0.2 | tR, MS |
| 2 | 1118 | 1118 c, 1085–1130 d | C10H16/136 | β-Pinene (1) | 5.8 | tR, MS |
| 3 | 1132 | 1132 c | C10H16/136 | Sabinene | tr | tR, MS |
| 4 | 1174 | 1174 c | C10H16/136 | Myrcene | tr | tR, MS |
| 5 | 1299 | 1299 e | C10H20O2/172 | 2-Methylbutyl isovalerate | tr | MS |
| 6 | 1491 | 1495 c | C15H24/204 | Bicycloelemene | 0.1 | MS |
| 7 | 1492 | 1445–1549 d | C15H24/204 | Cyclosativene | 0.4 | MS |
| 8 | 1497 | 1497 c | C15H24/204 | α-Copaene (2) | 0.5 | MS |
| 9 | 1550 | 1559 d, 1534–1580 d | C15H24/204 | cis-α-Bergamotene | 0.2 | MS |
| 10 | 1597 | 1583–1668 d | C15H24/204 | α-Guaiene | 0.3 | MS |
| 11 | 1600 | 1565–1608 d | C15H24/204 | β-Elemene (3) | 0.6 | MS |
| 12 | 1612 | 1612 c | C15H24/204 | β-Caryophyllene | 0.2 | tR, MS |
| 13 | 1621 | - | -/204 | Unknown 1 | 1.8 | MS |
| 14 | 1668 | 1669 e | C15H24/204 | (Z)-β-Farnesene | 0.2 | MS |
| 15 | 1669 | 1668 c, 1627–1668 d | C15H24/204 | Sesquisabinene | 0.3 | tR, MS |
| 16 | 1671 | 1643–1684 d | C15H24/204 | (E)-β-Farnesene | 0.1 | MS |
| 17 | 1687 | 1687 c | C15H24/204 | α-Humulene | 0.1 | tR, MS |
| 18 | 1719 | 1718 f | C15H24/204 | γ-Guaiene | 0.2 | MS |
| 19 | 1726 | 1726 c | C15H24/204 | Germacrene D (4) | 1.5 | MS |
| 20 | 1755 | 1755 c | C15H24/204 | Bicyclogermacrene (5) | 2.7 | tR, MS |
| 21 | 1772 | 1773 c | C15H24/204 | δ-Cadinene | 0.2 | tR, MS |
| 22 | 1784 | 1773–1786 d | C15H24/204 | (E)-α-Bisabolene (6) | 1.0 | MS |
| 23 | 1804 | 1812 g, 1808 h | C15H26O/222 | Liguloxide (7) | 1.6 | MS |
| 24 | 1868 | 1861 c | C15H24O/220 | 6-epi-Shyobunone (8) | 12.6 | MS |
| 25 | 1900 | 1893 c | C15H24O/220 | Isoshyobunone | tr | MS |
| 26 | 1916 | 1903 c | C15H24O/220 | Shyobunone (9) | 44.2 | MS |
| 27 | 1977 | 2028 k, 2052 k | C15H26O/222 | 10-epi-Junenol (10) | 5.8 | MS |
| 28 | 2053 | 2044 c | C15H24O/220 | epi-Isoshyobunone (11) | 9.8 | MS |
| 29 | 2084 | - | -/236 | Unknown 2 | 2.2 | MS |
| 30 | 2092 | - | -/220 | Unknown 3 | 1.1 | MS |
| 31 | 2232 | 2178–2234 d | C15H26O/222 | α-Bisabolol (12) | 0.5 | tR, MS |
| Monoterpene Hydrocarbons | 6.0 | |||||
| Sesquiterpene Hydrocarbons | 8.6 | |||||
| Oxygenated Sesquiterpenes | 74.5 | |||||
| Others | 5.1 | |||||
| Total % | 94.2 |
Compounds listed in order of their elution in HP Innowax FSC GC column. RRI a: relative retention indices experimentally calculated against n-alkanes; RRI b: RRI from literature (c [13], d [14], e [15], f [16], g [17], h [18], and k [19]) for polar column values, with % calculated from FID data; tr: trace (<0.1%); IM: identification method; tR: identification based on comparison with coinjected standards on an HP Innowax column; MS: identification based on computer matching of the mass spectra libraries.