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

Table 4.

Chemical composition of marjoram essential oil.

No. tret, min Compound Molecular formula RIexp RIlit Method of identification Area%
 Content %
Unshade Shade Unshade Shade
1 7.11 α-Thujene C10H16 927 924 RI, MS 0.4 0.3 0.07 0.08
2 7.33 α-Pinene C10H16 934 932 RI, MS, Co-I 0.3 0.4 0.06 0.08
3 8.53 Sabinene C10H16 974 969 RI, MS 4.4 4.8 0.89 1.06
4 8.66 β-Pinene C10H16 979 974 RI, MS, Co-I 0.3 0.3 0.18 0.21
5 9.02 Myrcene C10H16 991 988 RI, MS 1.4 1.5 0.28 0.33
6 9.54 α-Phellandrene C10H16 1006 1002 RI, MS 0.2 0.2 0.04 0.04
7 9.99 α-Terpinene C10H16 1018 1014 RI, MS 6.9 6.6 1.41 1.47
8 10.25 p-Cymene C10H14 1025 1020 RI, MS 0.6 0.6 0.12 0.12
9 10.43 Limonene* C10H16 1030 1024 RI, MS, Co-I 2.4 2.5 0.36 0.42
10 10.44 β-Phellandrene* C10H16 1030 1025 RI, MS
11 10.51 1,8-Cineole C10H18O 1032 1026 RI, MS, Co-I 0.1 0.1 0.05 0.03
12 10.68 (Z)-β-Ocimene C10H16 1037 1032 RI, MS – tr – 0.01
13 11.08 (E)-β-Ocimene C10H16 1047 1044 RI, MS 0.1 0.1 0.01 0.01
14 11.58 γ-Terpinene C10H16 1060 1054 RI, MS, Co-I 13.0 12.0 2.82 2.86
15 11.87 cis-Sabinene hydrate C10H18O 1068 1065 RI, MS 3.0 3.3 0.60 0.74
16 12.70 Terpinolene C10H16 1090 1086 RI, MS 2.9 2.6 0.58 0.57
17 13.14 Linalool C10H18O 1102 1095 RI, MS, Co-I 12.9 14.8 2.04 2.65
18 14.04 cis-p-Menth-2-en-1-ol C10H18O 1123 1118 RI, MS 1.9 2.2 0.38 0.48
19 14.77 trans-p-Menth-2-en-1-ol C10H18O 1141 1136 RI, MS 1.3 1.5 0.25 0.33
20 16.55 Terpinen-4-ol C10H18O 1183 1174 RI, MS 36.8 34.4 7.44 7.63
21 16.98 α-Terpineol C10H18O 1194 1186 RI, MS, Co-I 4.6 4.4 0.94 0.98
22 17.14 γ-Terpineol C10H18O 1198 1199 RI, MS 0.4 0.5 0.08 0.11
23 17.21 cis-Dihydro carvone C10H16O 1199 1191 RI, MS 0.3 0.2 0.06 0.04
24 17.51 trans-Dihydro carvone C10H16O 1206 1200 RI, MS 0.2 0.2 0.03 0.03
25 17.63 Linalool formate C11H18O2 1209 1214 RI, MS 0.6 0.7 0.13 0.16
26 18.47 Nerol C10H18O 1229 1227 RI, MS 0.1 0.1 0.02 0.02
27 19.64 Linalool acetate C12H20O2 1257 1254 RI, MS, Co-I 0.9 1.0 0.19 0.21
28 21.14 Thymol C10H14O 1292 1289 RI, MS, Co-I – 0.4 – 0.06
29 21.54 Terpinen-4-ol acetate C12H20O2 1301 1299 RI, MS 0.4 0.4 0.08 0.08
30 24.18 Neryl acetate C12H20O2 1365 1359 RI, MS 0.1 0.1 0.01 0.02
31 24.99 Geranyl acetate C12H20O2 1384 1379 RI, MS 0.1 0.2 0.02 0.04
32 26.54 (E)-Caryophyllene C15H24 1423 1417 RI, MS 1.3 1.5 0.25 0.34
33 27.89 α-Humulene C15H24 1457 1452 RI, MS 0.1 0.1 0.01 0.02
34 29.60 Bicyclogermacrene C15H24 1500 1500 RI, MS 0.8 0.9 0.16 0.20
35 32.69 Spathulenol C15H24O 1581 1577 RI, MS 0.2 0.1 0.05 0.01
36 32.92 Caryophyllene oxide C15H24O 1586 1582 RI, MS 0.3 0.1 0.07 0.02
Total identified (%) 99.3 99.1
Grouped components (%)
Monoterpene hydrocarbons (1–7, 9, 10, 12–14, 16) 32.3 31.3
Oxygen-containing monoterpenes (11, 15, 17–27, 29–31) 63.7 64.1
Sesquiterpene hydrocarbons (32–34) 2.2 2.5
Oxygen-containing sesquiterpenes (35, 36) 0.5 0.2
Aromatic compounds (8, 28) 0.6 1.0

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