Property | Value |
Name | Yield, Contents and Chemical Composition Variations in the Essential oils of Different Eucalyptus globulus trees from Tigray, Northern Ethiopia |
Description | Research article:- P.A. Subramanian1, Abraha Gebrekidan1, 2*, and Kebede Nigussie1, 3 1Department of Chemistry, College of Natural and Computational Sciences, Mekelle University, P.O.Box 231, Mekelle, Ethiopia. 2Department of Chemical Engineering, Laboratory of Applied Physical Chemistry and Environmental Technology, Katholieke Universiteit Leuven, Belgium. 3Department of Chemistry, Addis Ababa University, Addis Ababa, Ethiopia.
Abstract:- Eucalyptus trees are available abundantly in the Tigray Region, Ethiopia. The investigation has been carried out to find the feasibility for the extraction of medicinal quality eucalyptus oil in this area. A survey in this Region showed that Hagereselam, Korem and Maychew are the potential areas to collect the samples. The species has been identified as Eucalptus globulus in all the highlands of Tigray Region. Hydro-distillation method was employed for the extraction of oil. The oil extracted in the sample area has been analyzed to have 1.4602 - 1.4623 refractive index value, 0.918 - 0.919 specific gravity (sp.gr.), +9 - +10 optical rotation and negative for phellandrene test that satisfy the standards stipulated by British Pharmacopeia. The percentage oil content in the Eucalyptus globulus has been found to be in the range 0.8 - 2.0% w/w (% dry weight) depending upon the dryness of the leaves. The essential oils were analyzed by GC/MS where the composition of the ten commonly found compounds in the oils are as follows: 1,8-cineole (66.28 - 75.36%), cis-ocimen (15.92 - 21.33%), α-terpineol acetate (2.70 - 3.39%), α-terpineol (1.51 - 2.26%), aromadendrene (0.69 - 2.85%), globulol (0.82 - 1.43%), β-pinen (0.96 - 1.24%), β-myrcene (0.66 - 1.00%), 4-terpineol (0.46 - 0.52%) and camphene (0.16 - 0.27%) as the main leaf oil components. The oils could be used for medicinal purpose except in the case of Maychew it needs purification and enrichment so as to make its 1,8-cineole content greater than 70%.
Keywords:-Eucalyptus globules, Hydro-distillation, Eucalyptus oil, GC/MS, 1,8-Cineole,Tigray |
Filename | Gebrekidan Abraha et al.pdf |
Filesize | 221.54 kB |
Filetype | pdf (Mime Type: application/pdf) |
Creator | admin |
Created On: | 04/18/2012 00:00 |
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Last updated on | 05/23/2012 21:34 |
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