Contact Toxicity and Repellency of the Essential Oil from Bupleurum bicaule Helm against Two Stored Product Insects

Table 1

Chemical composition of the essential oil of Bupleurum bicaule.

Compounds	Relative content (%)			Identification methods
Aldehydes
(2E,4E)-2,4-Octadienal	0.8	1113	1109	MS; RI
(2E,4E)-2,4-Nonadienal	1.2	1214	1217	MS; RI
(2E,4E)-2,4-Decadienal	2.8	1317	1316	MS; RI
Monoterpenes
Bornyl acetate	1.1	1280	1281	MS; RI
Trans-2-isopropylbicyclonon-3-en-8-one	25.9	1765	1765	MS; RI
Sesquiterpenes
α-Longipinene	0.5	1352	1351	MS; RI
β-Elemene	0.8	1391	1393	MS; RI
β-Cuvebene	1.5	1390	1388	MS; RI
1,4,7,-Cycloundecatriene, 1,5,9,9-tetramethyl-, Z,Z,Z-	1.9	1456	1454	MS; RI
Calarene	2.1	1467	1463	MS; RI
γ-Gurjunene	2.0	1479	1472	MS; RI
(E,E)-α-Farnesene	0.4	1505	1505	MS; RI
β-Bisabolene	2.7	1510	1511	MS; RI
Cuparene	2.9	1502	1499	MS; RI
(E)-Nerolidol	0.5	1565	1564	MS; RI
Spathulenol	0.9	1582	1578	MS; RI
Caryophyllene oxide	1.4	1583	1580	MS; RI
Humulene oxide II	1.4	1607	1611	MS; RI
α-Cadinol	1.4	1653	1654	MS; RI
τ-Muurolol	0.6	1662	1660	MS; RI
Juniper camphor	0.3	1690	1693	MS; RI
Alkynes
(6Z)-6-Tridecen-4-yne	2.7	1470	1470	MS; RI
Aromatic compounds
1,4-Dimethoxy-2-tert-butylbenzene	4.3	1477	1477	MS; RI
Myristicin	1.6	1529	1523	MS; RI
2(1H)Naphthalenone,3,5,6,7,8,8a-hexahydro-4,8a-dimethyl-6-(1-methylethenyl)-	0.3	1772	1773	MS; RI
Others
4,5-Dimethyl-1,2,3,6,7,8,8a,8b-octahydrobiphenylene	23.5	1357	1357	MS; RI
Total	85.5

Retention index (RI) in this experiment relative to the homologous series of n-alkanes (C₅–C₃₆) on the HP-5 MS capillary column. RI in literature. Mass spectrum.