Volatile Leaf Oils of some South-western and Southern Australian Species of the GenusEucalyptus. Part XI. Subgenus Symphyomyrtus. A—Section Bisectaria. (a) Series Occidentales, (b) Unpublished series Annulatae, (c) Series Micromembranae, (d) Series Obliquae, (e) Series Dundasianae, (f) Series Cooperianae, (g) Series Halophilae, (h) Series Salmonophloiae, and (i) Series Pubescentes. B— Section Dumaria. (a) Series Merrickianae

Abstract

The volatile leaf oils of Eucalyptus occidentalis Endl. var. occidentalis, E. astringens (Maiden) Maiden, E. sargentii Maiden subsp. sargentii, E. stowardii Maiden, E. annulata Benth., E. macrandra F. Muell. ex. Benth., E. macrandra F. Muell. ex Benth. subsp. ‘olivacea’, E. aspratilis L.A.S. Johnson and K.D. Hill, E. grossa F. Muell. ex. Benth., E. dundasii Maiden, E. cooperiana F. Muell., E. halophila D.J. Carr & S.G.M. Carr, E. salmonophloia F. Muell., E. brockwayi C.A. Gardner, and E. merrickiae Maiden & Blakely isolated by vacuum distillation, were analysed by GC and by GC‐MS. Most species contained α‐pinene (5.1–47.2%), β‐pinene (0.1–16.4%), 1,8‐cineole (2.7–48.6%), p‐cymene (0.3–17.7%) and aromadendrene (1.2–20.0%) and bicyclogermacrene (0–28.5%) as principal leaf oil components.

Eucalyptus ( gracilis, oleosa, salubris , and salmonophloia ) Essential Oils: Their Chemical Composition and Antioxidant and Antimicrobial Activities

“…The chemical composition of essential oil of E. oleosa was reported in some studies. 13,25,32 Comparing the chemical composition of E. oleosa growing in central Tunisia 32 to our work, we noted a significant variation. a-Pinene (12.3%), limonene (12.1%), and 1,8-cineole (26.1%) were the major compounds of E. oleosa native in central Tunisia.…”

“…19,20,22 Most of these reports indicate that 1,8-cineole (eucalyptol) is the main and characteristic constituent of Eucalyptus essential oils. Chemical compositions of essential oils of the four species studied had been reported before, 13,22 –25,32 but the data analysis shows that the chemical composition of essential oils differs according to their origins, and there are quantitative differences of the individual components. Essential oil of E. salmonophloia of Australian origin (southwestern) 25 was reported to contain α-pinene (5.1%), β-pinene (9.7%), 1,8-cineole (10.3%), p -cymene (16.9%), trans -pinocarveol (2.3%), cryptone (10.5%), and spathulenol (2.0%).…”

“…The yields of E. salmonophloia and E. gracilis were relatively higher than the average essential oil yields reported by Penfold and Willis 10 from leaves of plamts growing in Australia (1.4% for E. salmonophloia and 0.9% for E. gracilis ). Other studies have reported that the yields of E. salmonophloia , 25 E. gracilis , 22 and E. salubris 23 from the mature leaves of plants native in Australia were 2.73%, 0.56%, and 1.51%, respectively. E. salubris from central Tunisia was less rich in the essential oil than that from the south, with a difference of 0.8%; E. oleosa of southern Tunisia was richer than that of central Tunisia, with a variation of 2.2%.…”

Chemical composition of 8 eucalyptus species' essential oils and the evaluation of their antibacterial, antifungal and antiviral activities

“…The Tunisian E. astringens essential oil had the same chemotype as that extracted from leaves picked from Moroccan tree plantations with an important difference in their mean percentages. Both of them were different from the Australian E. astringens essential oil [32], which was represented by β -caryophyllene (14.75%), p -cymene (17.72%), and α -pinene (12.53%). The same principal components were also observed in E. leucoxylon essential oil [33,34], whereas the essential oil obtained from Iran was significantly richer in 1,8-cineole (89.8%) than that from Tunisia [33].…”

Quantitative and Qualitative Variations in Eucalyptus Essential Oils Depending on Species and the Cultivation Location

“…Plants cultivated in Australia presented p-cymene (16.90%) as the major component, followed by cryptone (10.45%) and then 1,8-cineole (10.33%). 40 Eucalyptus torquata was distinguished from the other species by the richness in torquatone as major component which ranged from 36.57% to 44.78%. For other compounds, β-eudesmol (13.27% to 21.21%), 1,8-cineole (11.05% to 18.56%), ɑ-pinene (2.69% to 11.62%), transpinocarveol (2.64% to 14.90%) and γ-eudesmol (0.75% to 6.29%) were also the main compounds identified in this species, however their amounts vary from one region to another.…”