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Abstract

The phytochemical, antibacterial, antifungal and MIC (minimum inhibitory concentration) study of the leaves and bark of Colebrookea oppositifolia Smith was evaluated. Phytochemical screening C. oppositifolia Sm. indicated the presence of alkaloids, flavonoids, glycosides, steroids and saponins whereas terpenoids, tannins, and cardiac glycosides are showed only in bark extract. Petroleum ether extract showed maximum effectiveness against P. aeruginosa with bark extract (18±2.2 mm) and maximum antifungal potential exhibited by petroleum ether extract of leaves (15 ±0.3 mm) against A. nigar. It was noticed that the extracts in distilled water had not shown much potential. The MIC assay was carried out for further verification of results obtained by the Zone of Inhibition against both bacterial and fungal strains. The lowest MIC value is 0.09±0.3 at 1 mg/mL against E. coli exhibited by bark extract and 0.09±0.2 at 0.9 mg/mL against K. pneumoniae shown by leaf extract. Whereas, in fungi minimal MIC value exhibited 0.11±0.3 at 0.9mg/mL by leaf extract against A. oryzae. Hence, it is recommended further investigation to explore toxicological and clinical trials before using this plant as drug.
Keywords: Antibacterial; Antifungal;Colebrookea oppositifolia; Ethnomedicinal plant
http://dx.doi.org/10.19045/bspab.2018.70017