Table 7.
Chemical composition of the essential oil of Silphium integrifolium Michx.
| RI a | RI b | Compound | % ± SD | RI a | RI b | Compound | % ± SD |
|---|---|---|---|---|---|---|---|
| 800 | 797 | (3Z)-Hexenal | tr c | 1387 | 1387 | β-Cubebene | tr |
| 801 | 801 | Hexanal | 0.07 ± 0.02 | 1388 | 1389 | β-Elemene | 0.06 ± 0.01 |
| 810 | 796 | 2-Hexanol | tr | 1417 | 1419 | β-Ylangene | tr |
| 849 | 846 | (2E)-Hexenal | 0.33 ± 0.02 | 1418 | 1417 | β-Caryophyllene | 2.50 ± 0.02 |
| 850 | 844 | (3E)-Hexenol | 0.27 ± 0.04 | 1429 | 1430 | β-Copaene | tr |
| 922 | 921 | Tricyclene | 0.12 ± 0.00 | 1432 | 1432 | trans-α-Bergamotene | 0.13 ± 0.02 |
| 925 | 924 | α-Thujene | 0.19 ± 0.00 | 1454 | 1452 | α-Humulene | 1.07 ± 0.02 |
| 933 | 932 | α-Pinene | 58.59 ± 0.21 | 1469 | 1471 | 4,5-di-epi-Aristolochene | 0.05 ± 0.00 |
| 947 | 945 | α-Fenchene | tr | 1473 | 1478 | γ-Muurolene | 0.06 ± 0.01 |
| 949 | 946 | Camphene | 2.44 ± 0.02 | 1480 | 1484 | Germacrene D | 2.95 ± 0.01 |
| 971 | 969 | Sabinene | 1.78 ± 0.00 | 1482 | 1484 | (Z,Z)-α-Farnesene | 0.10 ± 0.01 |
| 977 | 974 | β-Pinene | 14.69 ± 0.07 | 1488 | 1489 | β-Selinene | 0.15 ± 0.01 |
| 988 | 988 | Myrcene | 9.70 ± 0.02 | 1491 | 1493 | trans-Muurola-4(14),5-diene | tr |
| 1004 | 1003 | p-Mentha-1(7),8-diene | tr | 1494 | 1500 | Bicyclogermacrene | 0.08 ± 0.00 |
| 1024 | 1020 | p-Cymene | tr | 1497 | 1500 | α-Muurolene | tr |
| 1028 | 1024 | Limonene | 1.76 ± 0.01 | 1512 | 1513 | γ-Cadinene | tr |
| 1030 | 1025 | β-Phellandrene | 0.31 ± 0.03 | 1517 | 1522 | δ-Cadinene | 0.10 ± 0.02 |
| 1034 | 1032 | (Z)-β-Ocimene | 0.05 ± 0.01 | 1575 | 1574 | Germacra-1(10),5-dien-4β-ol | 0.27 ± 0.02 |
| 1044 | 1044 | (E)-β-Ocimene | 0.44 ± 0.03 | 1581 | 1582 | Caryophyllene oxide | 0.47 ± 0.01 |
| 1057 | 1054 | γ-Terpinene | tr | 1609 | 1608 | Humulene epoxide II | 0.13 ± 0.01 |
| 1085 | 1086 | Terpinolene | tr | 2019 | 2026 | (E,E)-Geranyl linalool | 0.06 ± 0.01 |
| 1099 | 1099 | α-Pinene oxide | 0.10 ± 0.01 | 2228 | 2237 | 7α-Hydroxymanool | 0.16 ± 0.02 |
| 1112 | 1113 | (E)-4,8-Dimethylnona-1,3,7-triene | tr | 2300 | 2300 | Tricosane | tr |
| 1126 | 1122 | α-Campholenal | tr | 2500 | 2500 | Pentacosane | 0.16 ± 0.01 |
| 1140 | 1135 | trans-Pinocarveol | tr | 2700 | 2700 | Heptacosane | 0.16 ± 0.02 |
| 1145 | 1140 | trans-Verbenol | 0.11 ± 0.02 | Green leaf volatiles | 0.66 | ||
| 1162 | 1160 | Pinocarvone | tr | Monoterpene hydrocarbons | 90.09 | ||
| 1180 | 1174 | Terpinen-4-ol | tr | Oxygenated monoterpenoids | 0.38 | ||
| 1195 | 1195 | Myrtenal | 0.06 ± 0.01 | Sesquiterpene hydrocarbons | 7.37 | ||
| 1206 | 1204 | Verbenone | 0.10 ± 0.02 | Oxygenated sesquiterpenoids | 1.09 | ||
| 1368 | 1369 | Cyclosativene | 0.06 ± 0.00 | Others | 0.32 | ||
| 1375 | 1374 | α-Copaene | 0.08 ± 0.01 | Total Identified | 99.90 | ||
| 1383 | 1387 | β-Bourbonene | tr |
a RI = Retention index determined in reference to a homologous series of n-alkanes on a ZB-5ms column. b RI values from the databases. c tr = “trace” (<0.05%).