Table 2.

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

Compounds	LRIa on DB-5ms	LRIa on VF-WAXms	Amountb	Percentage
Sulphur compounds
Dimethyl disulphide	742	1080	32,307	18.96
Isobutyl isothiocyanate	929	1322	137	0.08
Dimethyl trisulphide	969	1388	63,208	36.62
3-Butenyl isothiocyanate	973	1462	995	0.57
Dimethyl tetrasulfide	1216	1750	14,244	8.16
All			112,673	64.40
Nitriles
3-Methyl-3-butenenitrile	759	–	28,026	16.06
Benzyl nitrile	1136	1893	1442	0.83
Benzenepropanenitrile	1237	2041	119	0.07
1H-Indole-3-acetonitrile	1807	–	1028	0.59
All			30,495	17.54
Aldehydes
Hexanal	803	1085	683	0.39
Heptanal	904	1186	110	0.06
(E)-2-Heptenal	958	1329	299	0.17
Benzaldehyde	962	1530	231	0.13
(E.E)-2.4-Heptadienal	1000	1508	92	0.05
Octanal	1004	1290	400	0.23
Phenylacetaldehyde	1044	1645	336	0.19
Nonanal	1105	1396	1150	0.66
Decanal	1207	1501	356	0.20
All			3657	2.10
Ketones
1-Penten-3-one	721	1020	3405	1.95
6-Methyl-5-hepten-2-one	985	1340	251	0.14
6-Methyl-3.5-heptadien-2-one	1096	1582	532	0.30
6.4.10-Trimethyl-2-pentadecanone (hexahydrofarnesyl acetone)	1844	2119	2302	1.32
All			6490	3.72
Alcohols
1-Octen-3-ol	980	1448	1871	1.07
(E)- 2-Octen-1-ol	1068	1616	867	0.50
1-Octanol	1071	1557	1945	1.11
1-Nonanol	1173	1659	98	0.06
All			4781	2.74
Acids
3-Methylbutanoic acid	834	1681	417	0.24
2-Methylbutanoic acid	845	1687	874	0.50
(Z)-3-Hexenoic acid	992	1940	80	0.05
2-Methyl-4-pentenoic acid	996	–	315	0.18
2-Ethylhexanoic acid	1115	1129	165	0.09
Octanoic acid	1171	2064	665	0.38
Nonanoic acid	1268	2165	836	0.48
Decanoic acid	1365	2267	386	0.22
All			3738	2.14
Esters
3-Methyl-1-butyl acetate	876	1121	290	0.17
Pentyl 2-methylpropanoate	1056	1243	254	0.15
Phenyl acetate	1064	1660	86	0.05
Methyl octanoate	1127	1411	1162	0.67
Carveyl acetate	1314	2071	150	0.09
Octyl 2-methylpropanoate	1347	1547	89	0.05
Benzyl 3-methylbutanoate	1392	1852	121	0.07
1-Methylethyl decanoate	1428	1615	409	0.23
1-Octen-3-yl hexanoate	1507	–	328	0.19
1-Methylethyl tetradecanoate	1826	2017	57	0.03
Methyl hexadecanoate	1926	2216	1563	0.90
Methyl linoleate	2095	2480	76	0.04
Methyl linolenate	2101	2503	357	0.20
All			4790	2.83
Terpenes
α-Pinene	933	1025	149	0.09
β-Pinene	978	1108	333	0.19
p-Cymene	1025	1270	600	0.34
Limonene	1029	1193	3632	2.20
Eucalyptol	1033	1206	715	0.41
α-Isophorone	1124	1621	805	0.46
Safranal	1200	1639	451	0.26
β-Cyclocitral	1220	1623	530	0.30
Citronellol	1232	1757	68	0.04
Carvacrol	1299	2225	110	0.06
Orivone	1354	–	133	0.08
All			7740	4.43
Hydrocarbons
Heptadecane	1700	1700	59	0.03
Octadecane	1800	1800	40	0.02
1-Eicosene	1994	2051	69	0.04
All			168	0.10

*Linear retention indexes calculated according to the Van Den Dool and Kratz equation.

^bPeak area arbitrary scale.