## 3 Results
### Chemical Composition  
Thirty-eight components were identified in the _M. armillaris_ EO using GC/MS and GC/FID techniques, representing 99.92% of the total EO analyzed on a non-polar DB-5 ms capillary column. The analysis showed that the EO consisted mainly of oxygenated monoterpene (77.01%), followed by monoterpene hydrocarbons (21.31%) and sesquiterpene hydrocarbons (1.31%). Oxygenated sesquiterpene occurs in the oil as a minor component. The chemical composition expressed in percentage is presented in Table 1, and the major compounds were 1,8-cineole (66.51%), Limonene (10.34%), \(\alpha\)-Terpineol (8.83%) and \(\alpha\)-Pinene (5.23%); the gas chromatogram is shown in Figure 3.  
\begin{table}
\begin{tabular}{c c c c c c} \hline \hline \(\mathbf{N}^{\circ}\) & **Compound** & **LRI a ** & **LRI b ** & **\%** & \(\pm\)**SD** \\ \hline
1 & \(\alpha\)-Thujene & 933 & 924 & 0.09 & 0.05 \\
2 & \(\alpha\)-Pinene & 938 & 932 & 5.23 & 0.52 \\
3 & Camphene & 952 & 946 & Trace & - \\
4 & Sabinene & 973 & 969 & 0.59 & 0.03 \\
5 & \(\beta\)-Pinene & 977 & 974 & 1.55 & 0.47 \\
6 & Myrcene & 990 & 988 & 2.22 & 0.16 \\
7 & \(\rho\)-Mentha-1(7),8-diene & 1002 & 1003 & Trace & - \\
8 & \(\delta\)-3-Carene & 1005 & 1008 & Trace & - \\
9 & \(\alpha\)-Terpinene & 1015 & 1014 & 0.19 & 0.03 \\
10 & Limonene & 1016 & 1024 & 10.34 & 1.58 \\
11 & 1,8-cineole & 1035 & 1026 & 66.51 & 1.33 \\
12 & (E)-\(\beta\)-Ocimene & 1046 & 1044 & 0.39 & 0.06 \\
13 & \(\gamma\)-Terpinene & 1056 & 1054 & 0.56 & 0.09 \\
14 & _cis_-Sabinene hydrate & 1070 & 1065 & Trace & - \\
15 & Terpinolene & 1083 & 1086 & 0.08 & 0.04 \\
16 & _trans_-Sabinene hydrate (IPP vs. OH) & 1101 & 1098 & Trace & - \\
17 & \(n\)-Nonanal & 1105 & 1100 & Trace & - \\
18 & _cis_-\(\rho\)-Menth-2-en-1-ol & 1124 & 1118 & Trace & - \\
19 & \(\delta\)-Terpineol & 1170 & 1162 & 0.16 & 0.09 \\
20 & Terpinen-4-ol & 1180 & 1174 & 0.66 & 0.18 \\
21 & \(\alpha\)-Terpineol & 1196 & 1186 & 8.83 & 0.79 \\
22 & Thymol & 1293 & 1289 & 0.11 & 0.09 \\
23 & Geranyl acetate & 1379 & 1379 & 0.68 & 0.06 \\
24 & (E)-Caryophyllene & 1415 & 1417 & 0.69 & 0.10 \\
25 & Aromadendrene & 1434 & 1439 & Trace & - \\
26 & _cis_-Muurola-3,5-diene & 1445 & 1448 & Trace & - \\
27 & \(\alpha\)-Humulene & 1451 & 1452 & 0.09 & 0.03 \\
28 & Allo-Aromadendrene & 1455 & 1458 & Trace & - \\
29 & Dauca-5,8-diene & 1455 & 1471 & Trace & - \\
30 & \(\gamma\)-Muroulene & 1487 & 1478 & 0.09 & 0.04 \\
31 & Neryi isobutanoate & 1491 & 1490 & 0.13 & 0.03 \\
32 & Bicyclogermacrene & 1495 & 1500 & 0.07 & 0.10 \\
33 & \(\beta\)-Bisabolene & 1508 & 1505 & Trace & - \\
34 & \(\delta\)-Amorphene & 1515 & 1511 & 0.20 & 0.02 \\
35 & Zonarene & 1519 & 1528 & Trace & - \\
36 & _trans_-Cadina-1,4-diene & 1528 & 1533 & Trace & - \\
37 & Globulol & 1582 & 1590 & 0.10 & 0.07 \\
38 & 1-epi-Cubenol & 1624 & 1627 & 0.06 & 0.02 \\ Monoterpene hydrocarbons (\%) & & & & 21.31\% & \\ Oxygenated monoterpenoids (\%) & & & & 77.01\% & \\ Sesquietpene hydrocarbons (\%) & & & & 1.31\% & \\ Oxygenated sesquiterpenenes (\%) & & & & 0.16\% & \\ Others (\%) & & & & 0.13\% & \\ Total identified (\%) & & & & 99.92\% & \\ \hline \hline \end{tabular}
\end{table}
Table 1: Chemical composition of _Melaleuca armillaris_ EO through a 5% phenyl-methylpolysiloxane column.