Table 1.

Composition as volatile constituents and classes of substances of B. incana leaf hydroalcoholic extract.

Compound	LRIa on DB-5ms	LRIa on VF-WAXms	Amountb	Percentage
Sulphur compounds
Dimethyl disulphide	742	1080	3959	1.99
Isobutyl isothiocyanate	929	1322	610	0.31
Dimethyl trisulphide	969	1388	21,163	10.66
3-Butenyl isothiocyanate	973	1462	85,532	43.10
Methyl methylthiomethyl disulphide	1135	1665	520	0.26
All			111,784	56.33
Nitriles
4-Pentenenitrile	745	1279	5254	2.65
Heptanenitrile	991	1408	120	0.06
All			5374	2.71
Aldehydes
(E)-2-Pentenal	758	1131	387	0.19
Heptanal	904	1186	776	0.39
(E)-2-Heptenal	958	1329	571	0.29
Octanal	1004	1290	1116	0.56
(E)-2-Octenal	1058	1433	140	0.07
Nonanal	1105	1396	4201	2.12
Decanal	1207	1501	7448	3.75
Undecanal	1307	1606	240	0.12
Dodecanal	1408	1711	1174	0.59
Tridecanal	1510	1817	559	0.28
Tetradecanal	1610	1922	1058	0.53
β-Cyclocitral	1220	1624	1388	0.70
Safranal	1200	1649	1071	0.54
All			20,128	10.14
Ketones
6-Methyl-5-hepten-2-one	985	1340	249	0.13
All			249	0.13
Alcohols
1-Hexanol	870	1347	188	0.09
1-Octen-3-ol	980	1448	233	0.12
2-Ethyl-1-hexanol	1028	1489	484	0.24
(Z)-2-Octen-1-ol	1060	1620	356	0.18
(E)-2-Octen-1-ol	1068	1616	101	0.05
1-Octanol	1071	1557	171	0.09
1-Nonanol	1173	1659	363	0.18
Dodecanol	1475	1966	15,106	7.61
Tetradecanol	1576	2171	5164	2.6
All			22,165	11.17
Acids
Butanoic acid	779	1636	5276	2.66
Hexanoic acid	978	1851	7856	3.96
Octanoic acid	1171	2064	3707	1.87
Hexadecanoic acid	1960	3000	2426	1.22
All			19,264	9.71
Esters
3-Methyl-1-butyl acetate	876	1121	829	0.42
Hexyl acetate	1011	1270	3001	1.51
1-Methylbutyl butanoate	1015	1208	509	0.26
Butyl hexanoate	1185	1412	664	0.33
Hexyl butanoate	1194	1415	228	0.11
Methyl hexadecanoate	1926	2216	3268	1.65
All			8498	4.28
Terpenes
Limonene	1029	1193	4363	2.20
(Z)-Calamenene	1531	1835	1335	0.67
Guaiol	1597	2087	2333	1.18
Bulnesol	1667	2208	2391	1.20
All			10,423	5.25

^aLinear retention indexes calculated according to the Van Den Dool and Kratz equation.

^bPeak area arbitrary scale.