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. 2021 Jul 15;28(11):6532–6543. doi: 10.1016/j.sjbs.2021.07.018

Table 3.

Chemical composition of thyme essential oil.

No. tret, min Compound Molecular formula RIexp RIlit Method of identification Area%
 Content %
Unshade Shade Unshade Shade
1 7.10 α-Thujene C10H16 927 924 RI, MS 0.8 1.1 0.18 0.28
2 7.32 α-Pinene C10H16 934 932 RI, MS, Co-I 0.5 0.7 0.12 0.17
3 7.78 Camphene C10H16 949 946 RI, MS, Co-I 0.3 0.3 0.07 0.07
4 8.52 Sabinene C10H16 974 969 RI, MS 0.1 tr 0.03 0.01
5 8.59 1-Octen-3-ol* C8H16O 979 974 RI, MS 1.2 1.7 0.27 0.44
6 8.64 β-Pinene* C10H16 978 974 RI, MS, Co-I
7 8.85 3-Octanone C8H16O 985 979 RI, MS 0.1 0.1 0.01 0.02
8 9.01 Myrcene C10H16 991 988 RI, MS 1.5 1.7 0.34 0.44
9 9.12 3-Octanol C8H18O 994 988 RI, MS 0.1 0.1 0.02 0.03
10 9.53 α-Phellandrene C10H16 1006 1002 RI, MS 0.2 0.2 0.04 0.05
11 9.74 δ-3-Carene C10H16 1012 1008 RI, MS 0.1 0.1 0.02 0.02
12 9.96 α-Terpinene C10H16 1018 1014 RI, MS 2.0 2.2 0.45 0.55
13 10.28 p-Cymene C10H14 1026 1020 RI, MS 12.4 14.2 2.80 3.60
14 10.41 Limonene* C10H16 1029 1024 RI, MS, Co-I 0.6 0.6 0.05 0.06
15 10.43 β-Phellandrene* C10H16 1030 1025 RI, MS
16 10.51 1,8-Cineole C10H18O 1032 1026 RI, MS, Co-I 0.5 0.4 0.05 0.03
17 11.07 (E)-β-Ocimene C10H16 1047 1044 RI, MS 0.1 0.1 0.02 0.02
18 11.58 γ-Terpinene C10H16 1060 1054 RI, MS, Co-I 14.3 14.8 3.49 4.04
19 11.85 cis-Sabinene hydrate C10H18O 1068 1065 RI, MS 1.1 0.9 0.24 0.24
20 12.67 Terpinolene C10H16 1089 1086 RI, MS 0.3 0.2 0.07 0.04
21 13.09 Linalool C10H18O 1100 1095 RI, MS, Co-I 3.1 2.3 0.32 0.21
22 14.01 dehydro-Sabina ketone C9H12O 1122 1117 RI, MS 0.2 0.1 0.05 0.02
23 14.74 trans-p-Menth-2-en-1-ol C10H18O 1140 1136 RI, MS 0.2 tr 0.04 0.01
24 15.00 Camphor C10H16O 1146 1141 RI, MS,Co-I 0.1 0.1 0.01 0.02
25 15.86 Borneol C10H18O 1167 1165 RI, MS, Co-I 1.0 0.8 0.23 0.19
26 16.38 Terpinen-4-ol C10H18O 1179 1174 RI, MS 3.7 0.8 0.85 0.20
27 16.98 α-Terpineol C10H18O 1194 1186 RI, MS, Co-I 0.3 0.1 0.06 0.03
28 17.72 Linalool formate C11H18O2 1211 1214 RI, MS 0.1 – 0.01 –
29 18.73 Thymol, methyl ether C11H16O 1235 1232 RI, MS 0.3 0.4 0.07 0.10
30 19.13 Carvacrol, methyl ether C11H16O 1244 1241 RI, MS 0.3 0.3 0.07 0.09
31 19.76 Linalool acetate C12H20O2 1259 1254 RI, MS, Co-I 0.2 0.1 0.04 0.03
32 21.38 Thymol C10H14O 1298 1289 RI, MS, Co-I 47.4 49.2 8.05 9.35
33 21.64 Carvacrol C11H16O 1304 1298 RI, MS 2.9 2.9 0.65 0.73
34 23.77 Thymol acetate C12H16O2 1355 1349 RI, MS 0.1 0.1 0.01 0.02
35 23.91 Eugenol C10H12O2 1358 1356 RI, MS, Co-I – 0.1 – 0.01
36 26.54 (E)-Caryophyllene C15H24 1423 1417 RI, MS 1.2 1.3 0.27 0.33
37 27.90 α-Humulene C15H24 1457 1452 RI, MS 0.1 0.1 0.02 0.02
38 28.64 Geranyl propanoate C11H22O2 1475 1476 RI, MS 0.2 0.1 0.04 0.03
39 28.79 γ-Muurolene C15H24 1479 1478 RI, MS – 0.1 – 0.02
40 29.60 Bicyclogermacrene C15H24 1499 1500 RI, MS 0.2 0.1 0.04 0.01
41 30.25 γ-Cadinene C15H24 1516 1513 RI, MS 0.1 0.1 0.02 0.03
42 30.62 δ-Cadinene C15H24 1526 1522 RI, MS 0.1 0.2 0.02 0.04
43 32.92 Caryophyllene oxide C15H24O 1586 1582 RI, MS 0.3 0.2 0.06 0.06
44 35.02 epi-α-Cadinol C15H26O 1644 1638 RI, MS 0.1 0.1 0.03 0.03
Total identified (%) 98.4 99.0
Grouped components (%)
Monoterpene hydrocarbons (1–4, 6, 8, 10–12, 14, 15, 17, 18, 20) 20.8 22.0
Oxygen-containing monoterpenes (16, 19, 21, 23–28, 31, 38) 10.5 5.6
Sesquiterpene hydrocarbons (36, 37, 39–42) 1.7 1.9
Oxygen-containing sesquiterpenes (43, 44) 0.4 0.3
Aromatic compounds (13, 29, 30, 32–35) 63.4 67.2
Others (5, 7, 9, 22) 1.6 2.0

tret.: Retention time; RIlit-Retention indices from literature (Adams, 2007); RIexp: Experimentally determined retention indices using a homologous series of n-alkanes (C8-C20) on the HP-5MS column. MS: constituent identified by mass-spectra comparison; RI: constituent identified by retention index matching; Co-I: constituent identity confirmed by GC co-injection of an authentic sample; tr = trace amount (<0.05%); *co-eluting compounds. Compounds marked in italic are present only in sample from unshade plants Compounds marked in under line are present only in sample from shade plants