ANTIMICROBIAL ACTIVITY OF AQUEOUS, ETHANOLIC AND METHANOLIC LEAF EXTRACTS FROM ACACIA SPP. AND Eucalyptus nicholii (original) (raw)
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Eucalyptus is a plant that is used in traditional medicine for the treatment as antimicrobial drugs. To calculate the potential of the plant, the antimicrobial activities of extracts of the leaves were evaluated against some common bacteria. The dried powdered leaves were extracted using aqueous and organic solvents (methanol, acetone and water). The antimicrobial activity of the concentrated extracts was evaluated by determination of the diameter of zone of inhibition against both gram negative and gram positive bacteria and fungi using the paper disc diffusion method. The least activity was shown by aqueous extract against E. coli (6.5 mm) and Bacillus subtilis (10 mm) while the maximum was recognized by the alcoholic extract, with a recorded zone diameter for E. coli (14 mm) and Bacillus subtilis (17 mm). Phytochemical screening of the plant exposed the presence of tannins, saponins and cardiac glycosides. The results of this analysis support the traditional use of Eucalyptus leaves as an antibacterial agent.
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