Table 2.

Chemical constituents of the thyme oil in the four regions. a: “–” means the compound is not identified; b: “tr” represent the percent of compound is lower than 0.05%; c:“RI” represent the Retention indices on the DB-5 column.

No	Name	RI	Samples
			QY	LD	JB	YL
Those composition possessing more than 0.1%
1	Artemisia triene	923	–	–	–	0.20
2	α-Thujene	926	1.01	–	0.36	–
3	α-Pinene	933	1.04	0.07	0.46	0.38
4	α-Fenchene	945	0.89	0.12	–	–
5	Camphene	949	–	–	0.81	0.50
6	Artemiseole	973	0.18	–	–	–
7	1-Octen-3-ol	974	–	–	1.15
8	β-Pinene	978	0.84	tr	0.30	0.25
9	3-Octanone	979	–	0.84	–	0.59
10	1-Decene		0.41	–	–	–
11	6-Methyl-5-hepten-2-one	981	–	0.26	–	–
12	3-Octanol	988	–	0.12		tr
13	Myrcene	990	–	0.64	0.54	0.27
14	Methyl-pentanoatel(2-Hydroxy-3-methyl-)	991	1.20	–	–	–
15	iso-Sylvestrene	1007	0.13	–	–	–
16	α-Terpinne	1014	–	–	–	0.46
17	α-Terpinene	1017	1.62	–	0.20	–
18	ρ-Cymene	1020	–	0.18	19.2	–
19	ο-Cymene	1022	12.10	–	–	–
20	(Z)-β-Ocimene	1031	0.60	–	–	–
21	Limonene	1024	–	0.13	0.69	0.40
22	1,8-Cineole	1026	10.16	1.84	5.22	7.23
23	Prenyl isobutyrate	1048	–	0.23	–	–
24	γ-Terpinene	1054	11.11	0.15	2.73	3.03
25	cis-Sabinene hydrate	1065	–	–	1.28	–
26	cis-Linalool oxide	1067	–	0.13	–	0.08
27	Terpinolene	1086	0.13	–	0.10	0.21
28	Linalool	1095	1.22	12.80	1.92	1.80
29	cis-ρ-Menth-2-en-1-ol	1118	–	–	0.58	–
30	Camphor	1141	0.11	0.12	0.63	–
31	trans-ρ-Menth-2-en-1-ol	1136	–	–	0.42	0.20
32	(Z)-Tagetone	1147	–	–	–	0.33
33	Borneol	1165	1.52	1.38	5.61	6.50
34	Terpinen-4-ol	1174	2.60	1.03	10.56	4.96
35	α-Terpineol	1186	1.06	–	1.26	–
36	γ-Terpineol	1199	–	3.04	–	0.68
37	ρ-Cymen-8-ol	1179	–	–	0.94	0.32
38	Thymol methyl ether	1233	3.38	–	1.67	1.63
39	Neral	1235	–	1.35	–	–
40	Carvacrol methyl ether	1241	–	–	2.25	2.48
41	Isobornyl acetate	1283	0.07	–	0.27	0.64
42	Thymol	1288	16.32	–	0.10	–
43	Bornyl acetate	1289	0.08	0.22	–	–
44	Carvacrol ethyl ether	1297	–	–	23.32	31.80
45	Carvacrol	1298	–	0.30	2.89	tr
46	ρ-vinyl guaiacol	1307	23.55	–	–	3.97
47	Dihydro citronellol acetate	1319	–	–	–	0.27
48	Thymol acetate	1345	0.09	–	0.48	–
49	4′-Methoxy-Acetophenone	1346	–	–	–	1.32
50	Eugenol	1354	–	0.08	–	1.24
51	Neryl acetate	1361	–	0.18	–	–
52	Carvacrol acetate	1370	–	–	tr	0.15
53	α-Ylangene	1372	tr	–	–	0.10
54	β-Bourbonene	1387	0.08	tr	tr	0.18
55	(E)-Caryophyllene	1416	1.91	–	2.04	4.27
56	(E)-Caryophylene	1418	–	3.02	–	–
57	β-Cedrene	1419	–	–	–	0.24
58	β-Copaene	1430	tr	0.09	tr	0.30
59	Aromadendrene	1439	0.15	tr	tr	–
60	α-Humulene	1450	0.09	–	0.11	0.34
61	9-epi-(E)-Caryophyllene	1464	–	0.15	–	–
62	Dauca-5,8-diene	1470	–	tr	0.06	0.35
63	trans-Cadina-1(6),4-diene	1475	–	–	–	0.15
64	γ-Gurjunene	1476	0.15	0.36	–	–
65	Viridiflorene	1496	0.10	–	–	–
66	Bicyclogermacrene	1500	0.18	–	–	–
67	β-Bisabolene	1504	2.84	2.36	1.03	1.12
68	δ-Amorphene	1513	–	0.08	–	0.40
69	γ-Cadinene	1514	0.16	–	–	–
70	Gerany butanoate	1562	–	0.25	–	–
71	Spathulene	1577	0.31	–	–	–
72	Spathulenol	1577	–	–	–	1.41
73	Caryophyllene oxide	1582	0.47	–	5.93	3.40
74	β-Copaen-4-α-ol	1590	–	0.36	–	–
75	Viridi florol	1592	–	–	–	0.13
76	Humulene epoxide II	1608	–	–	0.15	0.10
77	α-Acorenol	1632	–	–	–	0.13
78	Caryophylla-4(12),8(13)-dien-5β-ol	1639	–	–	–	0.24
79	α-Eudesmol	1652	–	–	0.19	–
	Monoterpene hydrocarbons		29.88	1.29	26.64	5.70
	Oxygenated monoterpenes		17.09	22.09	27.89	23.16
	Sesquiterpene hydrocarbons		5.97	6.06	3.24	7.45
	Oxygenated sesquiterpenes		0.47	0.36	6.27	5.41
	Phenolic monoterpenes		16.32	0.38	2.99	1.24
	others		28.13	1.70	28.44	41.79
Those composition possessing less than 0.1%
80	Tricyclene	921	tr	–	tr	tr
81	Thuja-2,4(10)-diene	954	–	–	tr	tr
82	Sabinene	969	–	–	0.07	tr
83	trans-meta-Mentha-2,8-diene	979	–	0.08	–	–
84	Dehydroxy-trans-Linalool oxide	991	–	0.06	–	–
85	α-Phellandrene	1002	–	–	–	0.06
86	δ-3-Carene	1008	–	–	–	0.02
87	σ-3-Carene	1009	0.06	–	–
88	(E)-β-Ocimene	1044	–	0.07	–	–
89	p-Mentha-2,4(8)-diene	1085	0.05	–	–	–
90	ρ-Mentha-2,4(8)-diene	1087	0.05	tr	–	–
91	α-Campholenal	1122	–	–	0.01	–
92	trans-Sabinol	1137	–	–	–	0.06
93	ρ-Menth-3-en-8-ol	1145	–	–	–	0.09
94	Nerol oxide	1153		0.07	–	–
95	σ-Terpineol	1162	0.01	–	–	–
96	Cumin aldehyde	1238	–	–	0.02	–
97	cis-Piperitone epoxide	1250	–	–	0.02	–
98	n-Tridecane	1300	–	–	0.03	–
99	σ-Elemene	1335	0.08	–	–	–
100	α-Copaene	1374	–	–	0.01	–
101	Modheph-2-ene	1382	–	–	0.02	–
102	β-Elemene	1386	–	0.07	tr	–
103	α-Isocomene	1387	–	–	0.05	–
104	β-Isocomene	1407	–	–	0.03	–
105	α-trans-Bergamotene	1430	tr	tr	tr	–
106	allo-Aromadendrene	1458	tr	tr	–	–
107	cis-Cadina-1(16),4-diene	1463	–	0.02	–	–
108	cis-Muurola-4(14),5-diene	1465	–	–	0.05	–
109	4,5-di-epi-Aristolochene	1471	–	–	–	0.02
110	γ-Muurolene	1478	–	–	–	0.06
111	ar-Curcumene	1479	–	–	0.03	–
112	β-Selinene	1490	–	–	tr	tr
113	γ-Amorphene	1494	–	0.03	–	–
114	Pseudowiddrene	1498	0.02	–	–	–
115	cis-β-Guaiene	1492	–	–	0.02	–
116	n-Pentadecane	1500	–	–	0.03	–
117	β-Sesquiphellandrene	1521	–	0.03	–	–
118	(E)-iso-γ-Bisabolene	1528	–	0.02	–	–
119	trans-Cadina-1,4-diene	1533	tr	–	–	0.05
120	α-Cadinene	1537	tr	–	–	0.07
121	α-Calacorene	1544	–	–	0.01	0.05
122	trans-Danca-4(11),7-diene	1556	–	0.02	–	–
123	β-Calacorene	1564	–	–	–	0.09
124	Guaiol	1600	–	0.07	–	–
125	Junenol	1618	–	–	–	0.04
126	1-epi-Cubenol	1627	–	–	–	0.07
127	Eremoligenol	1628	–	–	0.07	–
128	epi-α-Cadinol	1638	–	–	–	0.07
129	epi-α-Muurolol	1640	–	–	–	0.04
130	α-Cadinol	1653	0.01	–	–	–