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Research Article
Chemical Compositional and Intra Provenance Variation for Content of Essential Oil in Eucalyptus crebra

Najum Rasheed Ahmad, Muhammad Asif Hanif and Umer Rashid

Asian Journal of Plant Sciences, 2005, 4(5), 519-523.

Abstract

Variation in the oil yield and composition of essential oils from fifteen differently Eucalyptus crebra (E. crebra) trees adopted of Faisalabad was presented. Hydro-distilled leaves of Eucalyptus crebra ranged 0.29-1.33 % of essential oil. Extracted oils were resolved and identified by GC/FID (Gas chromatography) on Carbowex-20 M packed glass column. Maximum components (33) were detected in the oil of two different trees (i.e. tree No. 6 and 10). A total of 33 components were detected, out of which 6 amounting to approximately 60% of the oil were identified. In Eucalyptus crebra oils six components (α-pinene, β-pinene, Δ3 carene, α-phallendrine, Limonene and 1, 8-cineole), were positively identified. The principal constituent 1, 8-cineole, found in the fifteen oils of different trees, was ranged (11.87-43.80%). The other major components were ranged: β-pinene (0.20-12.13%), α-pinene (1.68-18.23%), Δ3 carene (1.32-5.63%) and α-phallendrine (0.55-7.98%). Only in the oil of one tree limonene (2.37%) was found. Chemical composition of oils from tree to tree varied significantly which may be due to the differences in their genetic make up (e.g., age, height) and may also be the effect of salinity. Eucalyptus crebra trees oil shown 1, 8-cinole percentage more than 70%, for that reason oils of Eucalyptus crebra trees under study were found suitable for medicinal purposes.

ASCI-ID: 7-820

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