Table 2.

Chemical composition of volatiles in the Origanum vulgare essential oil from Putre, Chile.

N°	Compounds	RI 1	Ref RI 2	%	Identification
1	α-Thujene	927	924	1.2	a
2	α-Pinene	936	932	0.7	a,b
3	Camphene	951	946	tr	a,b
4	Sabinene	971	974	6.5	a
5	β-Pinene	978	976	0.3	a,b
6	1-Octen-3-ol	978	979	0.2	a,b
7	Eucalyptol	988	988	tr	a
8	β-Myrcene	991	988	1.9	a,b
9	α-Phellandrene	994	1001	0.5	a
10	3-Octanol	993	991	tr	a
11	δ-3−Carene	1008	1008	tr	a
12	α-Terpinene	1020	1015	3.5	a
13	Z-β-Ocimene	1027	1032	0.9	a
14	p-Cymene	1028	1024	8.6	a,b
15	Limonene	1033	1027	0.9	a,b
16	E-β-Ocimene	1047	1044	0.2	a
17	α-Terpinolene	1053	1053	0.8	a
18	γ-Terpinene	1062	1058	10.6	a,b
19	Z-Sabinene hydrate	1073	1066	13.4	a
20	Z-Linalool oxide	1075	1067	tr	a
21	E-Linalool oxide	1082	1084	tr	a
22	E-Sabinene hydrate	1105	1098	2.0	a
23	β-Thujone	1114	1112	2.2	a
24	E-p-2-Menthen-1-ol	1124	1129	0.4	a
25	endo-Borneol	1160	1165	0.2	a
26	p-Cymen-8-ol	1180	1179	0.1	a
27	4-Terpineol	1179	1177	4.4	a
28	p-Cymen-7-ol	1181	1181	tr	a
29	α-Terpineol	1186	1186	1.8	a
30	E-Piperitol	1193	1207	0.3	a
31	Z-Piperitol	1207	1195	0.3	a
32	Nerol	1229	1227	tr	a
33	Thymol methyl ether	1237	1232	2.3	a
34	Carvacrol methyl ether	1245	1241	5.6	a
35	Geraniol	1250	1249	tr	a
36	Linalyl acetate	1256	1257	7.2	a
37	Bornyl acetate	1289	1284	tr	a
38	Thymol	1293	1289	15.9	a,b
39	Carvacrol	1300	1298	3.1	a,b
40	Eugenol	1357	1356	tr	a
41	Geranyl acetate	1380	1379	0.1	a
42	β-Caryophyllene	1420	1418	1.2	a,b
43	Aromadendrene	1442	1439	tr	a
44	α-Humulene	1454	1452	0.4	a
45	Bicyclogermacrene	1500	1494	1.5	a
46	δ-Cadinene	1524	1522	tr	a
47	Ledene	1552	1552	tr	a
48	Spathulenol	1573	1577	0.1	a,b
49	Caryophyllene oxide	1581	1582	0.1	a,b
50	Isospathulenol	1704	1704	tr	a
	Monoterpene hydrocarbons			38.7
	Oxygenated monoterpenes			38.0
	Phenolic monoterpenes			19.0
	Sesquiterpene hydrocarbons			3.1
	Oxygenated sesquiterpenes			0.2
	Others			0.2
	Total identified			99.2

^a Comparison of mass spectra with MS libraries and retention times. ^b Comparison with authentic compounds. tr: concentration lower than 0.05%. Compounds are listed in order of their elution on the HP-5MS column. ¹ Retention index on the HP-5MS column relative to C₈–C₂₄ n-alkanes. ² Retention index from the literature [26].