Table 2.
Main compounds detected in PREO through GC‒MS analysis
| No | RI | Compounds | Class | Relative peak area (%) |
|---|---|---|---|---|
| 1 | 1028 | α-Pinene | Monoterpene | 0.73 |
| 2 | 1112 | β-Pinene | Monoterpene | 0.10 |
| 3 | 1124 | 2,4(10)-Thujadiene | Monoterpene | 0.02 |
| 4 | 1161 | β-Myrcene | Monoterpene | 0.06 |
| 5 | 1199 | L-Limonene | Monoterpene | 0.13 |
| 6 | 1275 | o-Cymene | Monoterpene | 0.04 |
| 7 | 1280 | Terpinolene | Monoterpene | 0.05 |
| 8 | 1365 | Rose oxide | Monoterpene | 0.91 |
| 9 | 1367 | trans-Rose oxide | Monoterpene | 0.32 |
| 10 | 1429 | Perillen | Monoterpene | 0.02 |
| 11 | 1444 | p-Cymenene | Monoterpene | 0.02 |
| 12 | 1753 | Geranyl acetate | Monoterpene | 1.00 |
| 13 | 2169 | Eugenol | Monoterpene | 1.40 |
| 14 | 1231 | 2-Pentylfuran | Heteroaromatic | 0.03 |
| 15 | 1282 | trans-2-(2-Pentenyl) furan | Heteroaromatic | 0.02 |
| 16 | 1413 | Rosefuran | Heteroaromatic | 0.01 |
| 17 | 1213 | Eucalyptol | Monoterpenoid | 0.02 |
| 18 | 1250 | trans-β-Ocimene | Monoterpenoid | 0.07 |
| 19 | 1252 | β-Ocimene | Monoterpenoid | 0.07 |
| 20 | 1469 | Nerol oxide | Monoterpenoid | 0.05 |
| 21 | 1514 | Cyclohexane | Monoterpenoid | 0.24 |
| 22 | 1547 | β-Linalool | Monoterpenoid | 1.36 |
| 23 | 1765 | Citronellol | Monoterpenoid | 54.37 |
| 24 | 1797 | Nerol | Monoterpenoid | 4.20 |
| 25 | 1847 | Geraniol | Monoterpenoid | 9.26 |
| 26 | 1495 | Daucene | Sesquiterpene | 0.20 |
| 27 | 1579 | trans-α-Bergamotene | Sesquiterpene | 0.28 |
| 28 | 1586 | β-Copaene | Sesquiterpene | 0.21 |
| 29 | 1661 | α-Himachalene | Sesquiterpene | 0.58 |
| 30 | 1727 | β-Bisabolene | Sesquiterpene | 0.17 |
| 31 | 1735 | Bicyclogermacren | Sesquiterpene | 0.85 |
| 32 | 1746 | α-Farnesene | Sesquiterpene | 2.01 |
| 33 | 2215 | α-Bisabolol | Sesquiterpene | 0.67 |
| 34 | 2350 | Farnesol | Sesquiterpene | 0.40 |
| 35 | 1320 | 2-Heptanol | Fatty alcohols | 0.05 |
| 36 | 1450 | 1-Octene-3-ol | Fatty alcohols | 0.01 |
| 37 | 1615 | Citronellyl formate | Fatty alcohols | 0.15 |
| 38 | 1660 | Citronellol acetate | Fatty alcohols | 3.35 |
| 39 | 1903 | 2-Tridecanol | Fatty alcohols | 0.15 |
| 40 | 2165 | 1-Tetradecanol | Fatty alcohols | 0.14 |
| 41 | 1338 | 5-Hepten-2-one | Ketone | 0.02 |
| 42 | 1465 | 6-Methyl-5-hepten-2-ol | Ketone | 0.01 |
| 43 | 1598 | Methyl nonyl ketone | Ketone | 0.26 |
| 44 | 1809 | Tridecanone | Ketone | 1.85 |
| 45 | 2123 | Cyclododecanol | Ketone | 0.07 |
| 46 | 2217 | Pentacosane | Ketone | 4.66 |
| 47 | 1435 | Ethyl octanoate | Ester | 0.02 |
| 48 | 1813 | Phenethyl acetate | Ester | 0.24 |
| 49 | 2098 | Tetradecanol acetate | Ester | 0.56 |
| 50 | 2100 | Heneicosane | Alkane | 2.26 |
| 51 | 2108 | Pentadecanol | Alkane | 0.04 |
| 52 | 1184 | Heptanal | Aldehydes | 0.12 |
| 53 | 1639 | Isosativene | Terpene | 0.11 |
| 54 | 1725 | Naphthalene | Paradichlorobenzene | 0.30 |
| 55 | 1906 | β-Phenethyl alcohol | Ethanol | 1.28 |
| 56 | 2013 | Methyleugenol | Terpenoid | 3.99 |
| 57 | 2599 | 15-Hydroxy-α-muurolene | sesquiterpenoids | 0.45 |
| Monoterpene and aromatics | 4.86 | |||
| Monoterpenoid | 69.64 | |||
| Sesquiterpene | 5.37 | |||
| Fatty alcohols | 3.85 | |||
| Ketone | 6.87 | |||
| Ester and alkanes | 3.12 | |||
| Others | 6.25 | |||
| Total | 99.96 | |||