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

t (traces) = 0.1%; RI: retention index.