Table 2 GC-MS analyses of essential oils derived from C. sativum seeds via three different extraction methods
No. | Compounds | RIa | Relative amount (%) | ||
|---|---|---|---|---|---|
Steam distillation extraction | Hexane extraction | Supercritical fluid extraction | |||
1 | α-Pinene | 939 | 7.79 | 3.05 | 9.84 |
2 | Camphene | 953 | 1.51 | −b | − |
3 | Myrcene | 992 | 1.01 | − | − |
4 | Cymene | 1027 | 2.94 | − | − |
5 | Limonene | 1033 | 3.79 | − | − |
6 | Terpinene | 1074 | 3.97 | − | − |
7 | Terpinolene | 1084 | 1.15 | − | − |
8 | Linalool | 1100 | 66.80 | 70.67 | 70.80 |
9 | Camphor | 1139 | 6.46 | − | − |
10 | α-Terpineol | 1195 | 0.37 | − | − |
11 | Linalool oxide | 1212 | 0.50 | − | − |
12 | Citronellyl acetate | 1357 | − | 0.79 | − |
13 | Geranyl acetate | 1382 | 3.17 | 24.31 | 18.40 |
14 | Myristic acid | 1720 | − | − | 0.96 |
Major compound groups | |||
|---|---|---|---|
Acid | − | − | 0.96 |
Monoterpene alcohol | 67.17 | 70.67 | 70.80 |
Monoterpene esters | 3.17 | 25.10 | 18.40 |
Monoterpene ether | 0.50 | − | − |
Monoterpene ketone | 6.46 | − | − |
Monoterpene hydrocarbons | 22.16 | 3.05 | 9.84 |
Total (%) | 99.46 | 98.82 | 100 |
Yield (%) | 0.29 | 2.22 | 3.43 |