Table 2.

Gas chromatographic composition (% peak area) of Spanish origanum oil (SOO), coriander oil (CO) and Spanish marjoram oil (SMO) (% of total).

No	SOO			CO			SMO
	Compound	RI	%	Compound	RI	%	Compound	RI	%
1	α-Pinene	1028	0.54 ± 0.15	α-Pinene	1028	6.66 ± 0.16	α-Pinene	1028	3.08 ± 0.04
2	β-Myrcene	1168	1.11± 0.00	Camphene	1075	1.17 ± 0.02	Camphene	1075	1.35 ± 0.01
3	α-Terpinene	1182	0.97 ± 0.01	β-Pinene	1113	0.45 ± 0.00	β-Pinene	1113	4.73 ± 0.02
4	γ-Terpinene	1249	3.44 ± 0.01	Limonene	1203	2.62 ± 0.04	Sabinene	1124	3.95 ± 0.01
5	p-Cymene	1272	4.01 ± 0.01	γ-Terpinene	1248	0.84 ± 0.01	Limonene	1203	4.09 ± 0.01
6	Linalool	1541	4.14 ± 0.00	p-Cymene	1272	6.14 ± 0.09	1,8-Cineole	1209	69.15 ± 0.17
7	Bornyl acetate	1580	0.87 ± 0.03	Geraniol	1436	1.13 ± 0.01	p-Cymene	1272	3.34 ± 0.02
8	β-caryophyllene	1593	1.10 ± 0.01	Citronellal	1482	0.96 ± 0.03	Camphor	1509	1.21 ± 0.01
9	α-Terpineol	1696	0.77 ± 0.06	unidentified		0.81 ± 0.01	Linalool	1541	1.70 ± 0.01
10	Geranial	1730	2.79 ± 0.01	unidentified		4.79 ± 0.02	Terpinen-4-ol	1584	0.41 ± 0.008
11	Thymol	2165	0.69 ± 0.10	Linalool	1541	68.45 ± 0.27	β-Caryophyllene	1593	0.63 ± 0.008
12	Carvacrol	2213	79.11 ± 0.64	unidentified		0.41 ± 0.01	α-Terpineol	1696	3.81 ± 0.08
13				Geranyl acetate	1751	2.77 ± 0.06	Borneol	1699	1.39 ± 0.01
14				Cirtronellol	1767	0.48 ± 0.02	Caryophyllene oxide	1955	0.67 ± 0.02
15				unidentified		1.13 ± 0.04
	Total identified		99.54 ± 0.56	Total identified		98.82 ± 0.58	Total identified		99.52 ± 0.28

RI: retention indices relative, values are means ± standard deviations (n = 3); SOO—Spanish oreganum oil, SMO—Spanish marjoram oil, CO—coriander oil.