Table 2.
Constituents of the essential oil of Sigesbeckia jorullensis
| Components | Retention index | % |
| Monoterpenes | ||
| Sabinene | 970 | tr |
| Myrcene | 991 | 0·1 |
| Limonene | 1026 | tr |
| Thymyl methyl ether | 1234 | 0·1 |
| Sesquiterpenes | ||
| Geijerene (= geyrene) | 1139 | 0·1 |
| Bicycloelemene | 1336 | 0·3 |
| α‐Copaene | 1375 | 0·6 |
| Sesquiterpene hydrocarbon (m/z: 161, 105, 91, 120, 119, 81, 93, . . . 204) | 1388 | 0·1 |
| β‐Elemene | 1391 | 0·2 |
| β‐Caryophyllene | 1418 | 4·1 |
| β‐Cubebene | 1428 | 0·4 |
| trans‐α‐Bergamotene | 1435 | 0·6 |
| Sesquiterpene hydrocarbon (m/z: 161, 91, 105, 79, 93, 81, 41, . . . 204) | 1443 | 0·1 |
| α‐Humulene | 1452 | 1·2 |
| trans‐β‐Farnesene | 1458 | 4·0 |
| Sesquiterpene hydrocarbon (m/z: 161, 105, 119, 93, 91, 79, 81, . . . 204) | 1477 | 0·1 |
| Germacrene‐d | 1482 | 13·6 |
| Sesquiterpene hydrocarbon (m/z: 69, 93, 41, 161, 133, 79, 55, . . . 204) | 1485 | 0·5 |
| Bicyclogermacrene | 1496 | 1·4 |
| α‐Muurolene | 1499 | 0·1 |
| α‐Farnesene | 1509 | 4·9 |
| γ‐Cadinene | 1514 | 0·3 |
| δ‐Cadinene | 1523 | 0·7 |
| 1‐endo‐Bourbonanol | 1574 | 0·1 |
| Oxygenated sesquiterpene (m/z: 117, 43, 99, 70, 83, 85, . . . 187) | 1582 | 0·4 |
| Oxygenated sesquiterpene (m/z: 93, 43, 79, 80, 121, 91, . . . 187) | 1620 | 0·1 |
| Oxygenated sesquiterpene (m/z: 95, 121, 43, 109, 71, 79, 119, . . . 204) | 1642 | 0·4 |
| Oxygenated sesquiterpene (m/z: 161, 119, 121, 105, 95, 79, 43, . . . 204) | 1646 | 0·1 |
| epi‐α‐Muurolol (= T‐Muurolol) | 1654 | 0·6 |
| Oxygenated sesquiterpene (m/z: 67, 81, 79, 41, 95, 55, . . . 189) | 1662 | 0·2 |
| Oxygenated sesquiterpene (m/z: 79, 67, 80, 108, 93, 41, . . . 203) | 1667 | 0·5 |
| Diterpenes | ||
| 8,13‐Epoxy‐15,16‐dinorlab‐12‐ene | 1881 | 0·4 |
| (E,E)‐7,11,15‐Trimethyl‐3‐methylene‐hexadeca‐1,6,10,14‐tetraene | 1918 | 0·1 |
| Epimanoyl oxide | 2014 | 7·4 |
| Oxygenated diterpene (m/z: 69, 81, 93, 41, 107, 95, . . . 290) | 2031 | 8·6 |
| Oxygenated diterpene (m/z: 91, 117, 145, 105, 131, 79, . . . 275) | 2039 | 0·3 |
| Oxygenated diterpene (m/z: 128, 115, 129, 91, 143, 77, . . . 275) | 2054 | 0·1 |
| Phytol | 2112 | 0·2 |
| Oxygenated diterpene (m/z: 120, 43, 93, 138, 121, 81, . . . 275) | 2139 | 0·1 |
| Oxygenated diterpene (m/z: 69, 81, 41, 93, 95, 67, 107, . . . 306 | 2169 | 0·4 |
| Oxygenated diterpene (m/z: 245, 43, 137, 81, 95, 69, . . . 279) | 2177 | 0·2 |
| Oxygenated diterpene (m/z: 69, 109, 41, 81, 137, 43, . . . 276) | 2185 | 0·1 |
| Oxygenated diterpene (m/z: 245, 43, 137, 81, 69, 95, . . . 291) | 2227 | 0·8 |
| Oxygenated diterpene (m/z: 245, 43, 137, 81, 69, 95, . . . 291) | 2242 | 0·8 |
| Oxygenated diterpene (m/z: 91, 81, 79, 105, 93, 123, . . . 286) | 2258 | 0·2 |
| Oxygenated diterpene (m/z: 257, 55, 137, 81, 69, 95, . . . 291) | 2264 | 1·4 |
| Oxygenated diterpene (m/z: 177, 81, 43, 95, 291, 55, . . . 291) | 2318 | 0·1 |
| Oxygenated diterpene (m/z: 245, 137, 43, 81, 69, 95, . . . 309) | 2480 | 12·4 |
| Oxygenated diterpene (m/z: 245, 43, 137, 81, 69, 95, . . . 309) | 2501 | 3·1 |
| Oxygenated diterpene (m/z: 69, 81, 41, 93, 71, 95, 43, . . . 290) | 2406 | 1·6 |
| Alkanes | ||
| Heptacosane | 2699 | 0·6 |
| Nonacosane | 2899 | 0·3 |
| Aldehydes, ketones | ||
| trans‐2‐Hexenal | 846 | 0·1 |
| 2‐Heptanone | 890 | 0·2 |
| n‐Octanal | 1003 | 0·1 |
| n‐Nonanal | 1103 | 0·1 |
| n‐Decanal | 1205 | 0·1 |
| n‐Dodecanal | 1408 | 0·1 |
| Alcohols | ||
| n‐Octanol | 1073 | tr |
| 1‐Dodecanol | 1474 | 0·1 |
| 1‐Tetradecanol | 1675 | 0·1 |
| Acids | ||
| Octanoic acid | 1190 | 4·9 |
| Nonanoic acid | 1276 | 0·7 |
| Decanoic acid | 1370 | 0·8 |
| Dodecanoic acid | 1563 | 0·1 |
| Hexadecanoic acid | 1962 | 0·1 |
| Esters | ||
| Hexanoic acid 2‐methylpropyl ester | 1152 | 0·3 |
| 3‐Methylbutyl hexanoate | 1253 | 0·3 |
| 2‐Methylpropyl octanoate | 1348 | 0·1 |
| Hexanoic acid hexyl ester | 1386 | 0·3 |
| Docosanoic acid methyl ester | 2531 | 1·0 |
| Docosanoic acid ethyl ester | 2596 | 0·5 |
| Tricosanoic acid methyl ester | 2631 | 0·1 |
| Tetracosanoic acid, methyl ester | 2732 | 2·0 |
| Tetracosanoic acid, ethyl ester | 2797 | 0·6 |
| Pentadecanoic acid, methyl ester | 2832 | tr |
| Hexacosanoic acid, methyl ester | 2934 | 0·1 |
| Unknowns | ||
| m/z: 43, 69, 129, . . . 157 | 1161 | 1·2 |
| m/z: 82, 67, 57, 55, 41, 127, . . . 161 | 1578 | 0·1 |
| m/z: 127, 57, 128, 41, 55, 69, . . . 213 | 1703 | 0·1 |
| m/z: 180, 165, 43, 181, 91, 166, . . . 250 | 1707 | 0·2 |
| m/z: 69, 91, 145, 131, 41, 117, . . . 230 | 1916 | 0·1 |
| m/z: 91, 117, 145, 105, 77, 131, . . . 230 | 1977 | 9·0 |
| m/z: 91, 123, 119, 125, 77, 41, . . . 257 | 2036 | 0·2 |
| m/z: 245, 43, 137, 69, 81, 95, . . . 263 | 2496 | 0·3 |
Retention indices were calculated from gas chromatographic separations on a non‐polar stationary phase (column, 50 m CP Sil 5 CB).
tr, trace (< 0·05 %).
Besides the 85 compounds listed above, 19 minor unidentified components (together 1·7 %, w/w) could be detected with GC.