Research Article
Chemical Composition and Insecticidal and Repellent Effect of Essential Oils of Two Premna Species against Sitotroga cerealella
Table 1
Yield and chemical composition of essential oil of P. angolensis and P. quadrifolia leaves.
| | Name of the compound | RI | Premna angolensis | Premna quadrifolia | (%) | (%) |
| 1 | (Z)-3-Hexen-1-ol | 850 | 1.0 | — | 2 | α-Pinene | 933 | 5.0 | — | 3 | Sabinene | 965 | — | 3.7 | 4 | -Pinene | 970 | — | 0.6 | 5 | Octen-3-ol | 973 | 28.0 | 3.2 | 7 | Octan-3-one | 977 | 2.7 | — | 8 | Myrcene | 987 | 0.3 | — | 9 | Octan-3-ol | 991 | 1.4 | — | 10 | -Phellandrene | 996 | — | 1.0 | 11 | Limonene | 1022 | — | 1.9 | 12 | -Phellandrene | 1023 | — | 0.6 | 13 | p-Cymene | 1024 | 0.5 | 0.8 | 14 | Eucalyptol | 1025 | — | t | 15 | Limonene | 1027 | 1.4 | — | 16 | (E)--Ocimene | 1039 | — | 0.1 | 17 | -Terpinene | 1051 | — | 0.1 | 18 | (Z)-Sabinene hydrate | 1064 | — | 0.1 | 19 | Linalool | 1096 | 3.3 | — | 20 | Triacetonamine | 1108 | — | 2.8 | 21 | Terpinen-4-ol | 1174 | 2.5 | 0.5 | 22 | Naphthalene | 1178 | — | 0.9 | 23 | -Terpineol | 1188 | — | 0.1 | 24 | Methyl salicylate | 1194 | 2.2 | — | 25 | Nerol | 1221 | t | — | 26 | Ethyl salicylate | 1266 | t | — | 27 | -Cubebene | 1339 | — | 0.2 | 28 | -Ylangene | 1362 | — | 0.1 | 29 | -Copaene | 1369 | — | 1.7 | 30 | -Elemene | 1374 |
1.4 | 21 | 31 | (E)--Damascenone | 1384 | 1.2 | — | 32 | α-Gurjunene | 1400 | — | 2.0 | 33 | -Caryophyllene | 1414 | — | 13.1 | 34 | -Elemene | 1421 | — | 1.1 | 35 | (E)--Caryophyllene | 1424 | 13.5 | — | 36 | (E)--Bergamotene | 1424 | — | 0.8 | 37 | Aromadendrene | 1443 | 0.6 | — | 38 | (Z)--Farnesene | 1443 | — | 0.2 | 39 | Alloaromadendrene | 1454 | — | 0.4 | 40 | -Humulene | 1458 | 6.4 | 2.9 | 41 | Selina-4,11-diene | 1466 | — | 1.1 | 42 | Germacrene-D | 1475 | — | 8.9 | 43 | -Selinene | 1486 | 0.6 | 1.6 | 44 | -Patchoulene | 1490 | 2.8 | — | 45 | -Bulnesene | 1490 | — | 1.8 | 46 | -Farnesene | 1494 | — | 0.8 | 47 | -cadinene | 1499 | 0.9 | — | 48 | -Bisabolene | 1499 | — | 1.9 | 49 | Germacrene A | 1501 | — | 0.2 | 50 | -Cadinene | 1506 | — | 0.9 | 51 | (Z)-Calamenene | 1512 | — | 0.4 | 52 | -Cadinene | 1525 | 0.4 | 3.3 | 53 | Germacrene B | 1553 | — | 1.1 | 54 | (E)-Nerolidol | 1562 | 0.7 | — | 55 | Epiglobulol | 1565 | 2.2 | — | 56 | Spathulenol | 1571 | — | 0.2 | 57 | Caryophyllene oxide | 1577 | — | 1.3 | 58 | Globulol | 1590 | 11.2 | — | 59 | Humulene epoxide II | 1616 | 0.9 | — | 60 | Epi--muurolol | 1649 | — | 1.2 | 61 | Selin-11-en-4--ol | 1653 | — | 1.5 | 62 | -Cadinol | 1658 | 1.0 | — | 63 | Intermedeol | 1673 | 0.3 | — | 64 | Phytol | 2048 | 3.7 | 4.9 |
| Total (%) | 96.1 | 91% | Yield (%) | 0.056 | 0.102 | Hydrogenated monoterpenes (%) | 8.6 | 8.9 | Oxygenated monoterpenes (%) | 9.2 | 4.3 | Hydrogenated sesquiterpenes (%) | 26.6 | 65.5 | Oxygenated sesquiterpenes (%) | 20 | 9.1 | Oxygenated aliphatic compounds (%) | 31.7 | 3.2 |
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t (traces) = 0.1%; RI: retention index.
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