Table 1.

Chemical composition of commercial Thymus vulgaris essential oil.

# a	RI Lit b	RI Exp c	Class/Compound d	% e
			Monoterpene hydrocarbons	29.45
2	927	923	Tricyclene	0.07
3	930	927	α-Thujene	0.30
4	939	934	α-Pinene	1.52
5	954	949	Camphene	1.73
7	991	988	β-Myrcene	1.63
8	1003	1001	α-Phellandrene	0.12
9	1017	1015	α-Terpinene	0.89
10	1025	1025	p-Cymene	19.20
11	1029	1028	Limonene	0.48
13	1060	1058	γ-Terpinene	3.43
16	1089	1085	Terpinolene	0.08
			Oxygenated monoterpenes	59.95
12	1031	1031	1,8-Cineole	1.44
14	1070	1067	cis Sabinene hydrate	0.11
15	1073	1072	trans Linalool oxide	0.06
17	1097	1096	Linalool	5.67
18	1146	1141	Camphor	1.05
19	1153	1149	Menthone	1.08
20	1169	1163	Borneol	1.79
21	1172	1169	Menthol	0.48
22	1177	1174	Terpinen-4-ol	1.97
23	1183	1186	<iso>-Menthol	0.10
24	1189	1190	α-Terpineol	0.11
25	1235	1227	Thymol methyl ether	0.37
26	1245	1237	Carvacrol methyl ether	0.51
27	1238	1245	Neral	0.05
28	1242	1249	Carvone	0.31
29	1291	1281	p-Cymen-7-ol	0.05
30	1290	1295	Thymol	42.10
31	1299	1300	Carvacrol	2.70
			Sesquiterpenes	7.93
32	1351	1344	α-Cubebene	0.05
34	1377	1369	α-Copaene	0.15
35	1419	1411	β-Caryophyllene	6.40
36	1466	1450	<9-epi-(E)>-Caryophyllene	0.05
37	1485	1481	Germacrene D	0.08
38	1514	1500	γ-Cadinene	0.06
39	1523	1506	δ-Cadinene	0.23
40	1583	1568	Caryophyllene oxide	0.80
41	1670	1652	<14-Hydroxy-9-epi-(E)>-Caryophyllene	0.11
			Others	1.32
1	855	858	3-Hexen-1-ol	0.23
6	979	978	1-Octan-3-ol	0.87
33	1359	1350	Eugenol	0.22

^a The numbering refers to elution order; ^b Literature retention index (RI); ^c Retention index (RI) relative to a standard mixture of n-alkanes on SPB^TM-5 column; ^d Identified compounds (<0.05% have not been reported); ^e Relative peak area percent represent averages of 3 determinations.