The leaf oils of the Australian species of Citrus (Rutaceae)
2001
Brophy, J.J. | Goldsack, R.J.
The leaf oils of the six species of Citrus that are endemic to Australia have been investigated. C. australasica produced an oil in which the principal components were bicyclogermacrene (19-28%), germacrene-D (2-8%), delta-elemene (0.5-11%) and limonene (12-24%). C. australis oil was dominated by alpha-pinene (68-79%). The oil from C. garrawayi appeared to be of two forms, (1) in which the principal components were the monoterpene alpha-pinene (18-40%), together with beta-caryophyllene (7-12%), alpha-humulene (2-17%), globulol (4-10%) and viridiflorol (4-10%), and (2) which lacked alpha-pinene and had beta-caryophyllene (17-30%), globulol (7-10%) and viridiflorol (7-10%) as principal components. C. glauca contained alpha- and beta-pinene(24-47% and 12-17%, respectively) and the two furanoid forms of linalool oxide (0.8-15% total) as principal components. The oil of C. gracilis contained gamma-terpinene (33.8%), p-cymene (14.8%), bicyclogermacrene (10.2%) and (E)-nerolidol (20.4%) as principal components, accounting for 80% of the oil. C. inodora gave an oil in which germacrene D (0.4-24%), germacrene B (1-9%) and bicyclogermacrene (0.9-19%) were the principal components.
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