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

^aRT, retention time; ^bRI, Kovats retention indices determined relative to a series of n-alkanes (C9–C29) on a nonpolar (HP5-MS capillary) column.