## 2 Results and Discussion
### The Headspace C. erythraea _VOC Composition_
erythraea_ headspace (most likely due to high volatility and solvent delay applied for the oil GC analysis). \begin{table}
\begin{tabular}{c l c c c} \hline \hline \multirow{2}{*}{**No.**} & \multirow{2}{*}{**Compound**} & **RI** & **RI** & **Area percentage (\%)** \\  & & **HP-5 MS** & **HP-FFAP** & **A** & **B** \\ \hline
36. & Naphthalene & 1190 & / & 8.2 & 1.8 \\
37. & \(\alpha\)-Terpineol & 1198 & 1717 & 1.5 & 0.6 \\
38. & Decanal & 1211 & 1518 & 2.3 & 1.1 \\
39. & Verbenone & 1217 & / & 0.7 & 0.4 \\
40. & Bornyl acetate & 1295 & 1601 & 0.9 & 0.4 \\
41. & Safrole & 1295 & / & 2.7 & - \\
42. & Menthyl acetate & 1299 & / & 1.6 & 0.9 \\
43. & Tridecane & 1300 & 1300 & 0.9 & 1.0 \\
44. & \(\alpha\)-Copaene & 1382 & 1510 & 2.0 & 0.8 \\
45. & (\(E\))-\(\beta\)-Damascenone & 1390 & 1848 & 1.1 & - \\
46. & Tetradecane & 1400 & 1400 & 3.2 & 1.4 \\
47. & Longifolene & 1409 & 1592 & 1.0 & 1.6 \\
48. & \(\beta\)-Caryophyllene & 1425 & 1618 & 3.7 & 1.6 \\
49. & \(trans\)-\(\beta\)-Farnesene & 1464 & 1677 & 2.5 & 0.7 \\
50. & Hexadecane & 1600 & 1600 & 1.8 & 1.4 \\
51. & Heptadecane & 1700 & 1700 & 1.0 & - \\
52. & Nonadecane & 1900 & 1900 & 0.8 & - \\  & & Total identified (\%) & 93.7 & 93.9 \\ \hline \hline \end{tabular}  
* = compound not found; / = compound not identified on the column; *
- correct isomer not identified.  
\end{table} 
Table 1: _Cont._ \begin{table}
\begin{tabular}{l l c c c c c} \hline \hline \multirow{2}{*}{**No.**} & \multirow{2}{*}{**Compound**} & **RI** & **RI** & \multicolumn{2}{c}{**Peak area (\%)**} \\  & & **HP-5 MS** & **HP-FFAP** & **C** & **D** & **E** \\ \hline
1. & Ethyl acetate & \(<\)900 & 901 & - & - & 1.3 \\
2. & Hexanal & \(<\)900 & 1105 & - & - & 1.1 \\
3. & 4-Methyloctane \({}^{*}\) & \(<\)900 & / & - & 0.3 & - \\
4. & 1,4-Dimethylbenzene \({}^{*}\) & \(<\)900 & / & - & 0.2 & - \\
5. & Nonane & 900 & 900 & - & 8.6 & 0.2 \\
6. & Undecane & 1100 & 1100 & - & 0.6 & - \\
7. & Linalool & 1107 & 1560 & 3.0 & - & 3.9 \\
8. & Nonanal & 1109 & / & 0.2 & - & 0.5 \\
9. & \(\beta\)-Thujone & 1112 & 1450 & 0.8 & - & 1.1 \\
10. & Camphor & 1152 & 1548 & 1.5 & - & 1.8 \\
11. & Menthone & 1162 & 1490 & 2.5 & - & 3.3 \\
12. & Isomenthone & 1172 & 1519 & 0.3 & - & 0.9 \\
13. & Borneol & 1175 & 1723 & 1.4 & - & 1.6 \\
14. & Menthol & 1183 & 1658 & 7.0 & - & 8.8 \\
15. & Terpinen-4-ol & 1186 & 1623 & 1.2 & - & 1.5 \\
16. & \(\alpha\)-Terpineol & 1198 & 1717 & 1.1 & - & 1.4 \\
17. & Methyl clavicol (Estragole) & 1205 & 1697 & 2.6 & 1.1 & 0.9 \\
18. & Decanal & 1211 & 1518 & 0.1 & - & 0.3 \\
19. & Pulegone & 1248 & 1677 & 0.2 & - & 0.8 \\
20. & Carvone & 1252 & 1767 & 1.5 & - & 2.0 \\
21. & Piperitone & 1263 & 1761 & 0.7 & - & 0.3 \\
22. & Geraniol & 1264 & 1865 & 0.2 & - & - \\
23. & Boryl acetate & 1295 & 1601 & 0.7 & - & 0.9 \\
24. & _trans_-Anethole & 1293 & 1860 & 3.6 & 1.5 & 1.0 \\
25. & Menthyl acetate & 1299 & / & 0.3 & - & 0.7 \\
26. & Thymol & 1307 & 2152 & 2.6 & - & 5.8 \\
27. & Carvacrol & 1318 & 2189 & 6.1 & - & 13.8 \\
28. & _trans_, _trans_-Deca-2,4-dienal & 1325 & 1839 & 0.2 & - & - \\
29. & \(\alpha\)-Copaene & 1382 & 1510 & 0.3 & 0.6 & - \\
30. & (\(E\))-\(\beta\)-Damascenone & 1390 & 1848 & 2.3 & & 2.8 \\
31. & Tetradec-1-ene & 1397 & / & - & 0.5 & - \\
32. & Tetradecane & 1400 & 1400 & - & 0.3 & - \\
33. & Longifidene & 1409 & 1592 & - & 0.5 & - \\
34. & Methyleugenol & 1414 & / & 0.3 & - & - \\
35. & \(\beta\)-Caryophyllene & 1425 & 1618 & 0.9 & 1.1 & - \\
36. & \(\alpha\)-Humulene & 1460 & 1691 & - & 0.5 & - \\
37. & Geranyl acetone & 1461 & 1875 & 1.3 & - & 0.7 \\
38. & _trans_-\(\beta\)-Farnesene & 1464 & 1677 & 1.3 & 1.0 & - \\
39. & \(\alpha\)-Amorphene & 1483 & 1707 & 0.2 & 0.5 & - \\
40. & Ar-curcumene & 1490 & 1791 & 0.2 & 0.7 & - \\
41. & (\(E\))-\(\beta\)-Ionone & 1493 & 1958 & 1.4 & - & 2.0 \\
42. & \(\alpha\)-Selinene & 1500 & 1747 & - & 0.8 & - \\ \hline \hline \end{tabular}
\end{table} 
Table 2: The essential oil composition of _C. erythraea_ (**C**) and its fractions: **D**–non-polar fraction and **E**–polar fraction.