However, the increase is not linear as the data yielded the coefficient of determination, [R.sup.2] [less than or equal to] 0.9126 for terpinyl acetate although visually this was the most nonlinear curve (data not shown pictorially).
As can be seen in Figure 3, extraction efficiency of the VOCs increased 1.5-fold for the two pinene types and eucalyptol while those of terpineol and terpinyl acetate increased about 2.5 to 4.5 at 65[degrees]C compared to the 20[degrees]C (room temperature).
Moreover, other components such as pinene, sabinene, limonene, artemisia ketone, a-linalool, E-sabinol, borneol, a-terpineol, nerol, a-cubebene, a- terpinyl acetate
, a-isocomene, bicyclogermacrene, spathulenol, chamazulene, guaiazulene may also contribute
In this study, the leaf essential oil of Eucalyptus globulus, 54 compounds were identified, which made up 63.96.% of the total essential oil and the major constituents was: 1 .8-Cineole (22.35%), other components present in appreciable contents were Limonene, (7.01%), Solanol (6.05%), [beta]-pinene (5.20%), Trans-verbenol (4.02%), Terpinen-4-ol (3.10%), Aristolene (2.35%), terpinyl acetate
(2.10%), Isosativene (1.85%), sabinene (1.49%), a-myrcene (1.15%) and a-terpineol (1.10%).