More than 60 compounds were identified in the essential oils of 11 Eucalyptus species, namely E. leucoxylon F. Muell; E. punctata DC; E. sideroxylon Cunn; E. saligna Smith; E. cladocalyx F. Muell; E. blakelyi A.Cunn; E. ovata Labill; E. albens Miq.ex Benth; E. camaldulensis DC., and E. globulus Labill. The major compounds were 1,8-cineole, a-pinene, p-cymene, spathulenol, and benzaldehyde.
Interestingly, the major volatile organic compound, 1,8-cineole, was also the predominant one in the atmospheric emission of E. globulus Labill. This result could provide an important insight about the origin of 1150 TgC (Tg=1012g) of biogenic volatile organic compounds emitted each year into our atmosphere (Guenther et al., 1995) by terrestrial trees.
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