Research Article
Larvicidal, Ovicidal, and Repellent Activities of Leucas stachydiformis (Hochst. ex Benth.) Briq Essential Oil against Anopheles arabiensis
Table 1
Chemical compositions of the essential oil isolated from the leaves of Leucas stachydiformis.
| No. | Components | | RI (HP5-MS)b | Area or content (%) |
| 1 | α-Pinene | 5.19 | 931 | 0.24 | 2 | 1-Octen-3-ol | 6.37 | 977 | 0.92 | 3 | Linalool | 10.48 | 1100 | 3.33 | 4 | trans-Verbenol | 12.21 | 1142 | 1.97 | 5 | α-Terpineol | 14.10 | 1189 | 1.26 | 6 | Verbenone | 14.84 | 1207 | 0.46 | 7 | Modheph-2-ene | 21.93 | 1376 | 0.37 | 8 | β-Bourbonene | 22.18 | 1382 | 1.49 | 9 | trans-caryophyllene | 23.57 | 1415 | 12.29 | 10 | α-Humulene | 24.94 | 1450 | 4.81 | 11 | γ-Muurolene | 25.92 | 1474 | 2.00 | 12 | Germacrene D | 26.07 | 1478 | 19.06 | 13 | trans-β-ionone | 26.31 | 1483 | 0.55 | 14 | Bicyclogermacrene | 26.68 | 1493 | 1.62 | 15 | δ-Cadinene | 27.78 | 1521 | 0.54 | 16 | Germacrene B | 28.99 | 1552 | 2.35 | 17 | Spathulenol | 29.79 | 1573 | 2.77 | 18 | Caryophyllene oxide | 29.98 | 1578 | 19.84 | 19 | Humulene epoxide II | 30.96 | 1604 | 3.57 | 20 | τ-Cadinol | 32.20 | 1638 | 1.14 | 21 | α-Cadinol | 32.69 | 1651 | 1.55 | 22 | 15-Hydroxy-α-muurolene | 33.81 | 1682 | 0.38 | 23 | 6,10,14-Trimethyl-2-pentadecanone | 39.47 | 1844 | 1.04 | 24 | Phytol | 47.90 | 2111 | 6.81 | | Sesquiterpene hydrocarbons | | | 45.07 | | Oxygenated sesquiterpenes | | | 30.27 | | Oxygenated monoterpene | | | 7.03 | | Hydrogenated diterpene | | | 6.81 | | Monoterpene hydrocarbons | | | 0.24 | | Others | | | 0.92 | | Total identified | | | 90.34 |
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aRT, retention time; bRI, Kovats retention indices determined relative to a series of n-alkanes (C9–C29) on a nonpolar (HP5-MS capillary) column.
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