Table 2.
Chemical composition of essential oil of Senecio polyanthemoides Sch. Bip.
| (%) Composition | ||||||||
|---|---|---|---|---|---|---|---|---|
| Sample A | Sample B | |||||||
| Compounds | RRI | m/z | ||||||
| F | L | S | F | L | S | |||
| α-pinene | 938 | 7.4 | 11.8 | 21.4 | 1.8 | 7.0 | 4.2 | 93, 79, 41,136 |
| sabinene | 972 | 3.5 | 3.2 | 5.4 | tr | 4.0 | - | 93, 77, 41, 136 |
| β-pinene | 981 | 7.6 | 7.6 | 12.4 | 16.5 | 7.8 | tr | 93, 41, 79, 136 |
| myrcene | 991 | 15.7 | - | - | 14.3 | 31.7 | 4.3 | 41, 93, 69, 136 |
| α-phellandrene | 1003 | 2.7 | - | - | 7.8 | - | - | 93, 77, 41, 136 |
| p-cymene | 1022 | 24.7 | 5.3 | 18.7 | 36.3 | 4.9 | 20.1 | 119, 91, 77, 134 |
| limonene | 1029 | 18.3 | 8.7 | 18.1 | 3.1 | 19.7 | 43.0 | 68, 93, 79, 136 |
| 1,8-Cineole | 1031 | - | 11.4 | 9.3 | - | - | - | 43, 81, 55, 154 |
| Z-(β)-ocimene | 1027 | 4.4 | - | - | 3.8 | 15.9 | - | 93, 79, 41, 136 |
| E-(β)-ocimene | 1035 | 8.3 | - | - | 7.1 | tr | - | 91, 79, 41, 136 |
| γ-terpinene | 1056 | - | - | - | 0.3 | - | - | 93, 77, 121, 136 |
| terpinolene | 1083 | - | - | - | 0.3 | - | - | 93, 121, 79, 136 |
| linalool | 1096 | - | - | - | 0.6 | - | - | 43, 71, 55, 154 |
| terpinen-4-ol | 1176 | 4.4 | - | - | 0.1 | - | - | 71, 41, 93, 154 |
| α-copaene | 1373 | - | - | - | 0.1 | - | - | 119, 161, 105, 204 |
| β-caryophyllene | 1421 | - | - | - | 0.6 | - | - | 41, 91, 79, 204 |
| α-humulene | 1452 | - | - | - | 0.9 | 2.9 | - | 93, 80, 41 204 |
| (Z,E)-α-farnesene | 1457 | - | - | - | 0.1 | - | - | 93, 41, 135, 204 |
| germacrene D | 1479 | tr | - | - | - | 0.3 | 2.4 | 161, 105, 91, 204 |
| β-selinene | 1482 | - | 32.7 | - | - | 1.3 | - | 107, 93, 121, 204 |
| unknown | 1487 | tr | - | - | - | 1.9 | - | 41, 121, 93, 204 |
| (E,E)-α-farnesene | 1494 | - | - | - | 0.1 | - | - | 41, 93, 69, 204 |
| δ -cadinene | 1518 | - | - | - | 0.1 | - | - | 161, 119, 134, 204 |
| caryophyllene oxide | 1572 | tr | 13.4 | 5.7 | - | - | 4.1 | 41, 79, 93, 220 |
| humulene epoxide II | 1596 | - | - | 8.6 | - | - | 10.3 | 43, 67, 109, 220 |
| farnesol | 1719 | - | - | - | 0.1 | - | - | 41, 69, 81, 93 |
| Monoterpene hydrocarbons | 92.6 | 36.6 | 85.3 | 92.0 | 91.0 | 71.6 | ||
| Oxygenated monoterpenes | 4.4 | 11.4 | 9.3 | 0.1 | - | - | ||
| Sesquiterpene hydrocarbons | - | 32.7 | - | 2.3 | 8.5 | - | ||
| Oxygenated sesquiterpenes | - | 13.4 | 14.3 | 0.1 | - | 14.4 | ||
| Total identified | 97.0 | 94.1 | 99.6 | 95.3 | 99.5 | 86.0 | ||
RRI = Retention relative index to C9-C24 n-alkanes on DB-5 column; tr. = trace amount (< 0.05%); F = flowers; L = leaves; S = stems; Sample A = Owen Sithole College of Agriculture, Empangeni; Sample B = KwaDlangezwa road, off University of Zululand, KwaDlangezwa.