Browsing by Author "Ogwal -Okeng, Jasper"
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Item Antimicrobial activity and phytochemical fingerprints of five crude extracts obtained from indigenous medicinal plants of Uganda(2017) Katuura, Esther; Bossa, Godfrey Sande; Waako, Paul; Ogwal -Okeng, JasperFive crude extracts from four Ugandan plants were screened in vitro for their antimicrobial activity and phytochemical composition. They included the chloroform extracts of Bothliocline longipes, Maesa lanceolata, Trimeria bakeri, Rhus natalensis and the petroleum ether extract of T. bakeri. The plant crude extracts were tested against Staphylococcus aureus (ATCC 25923), Escherichia coli (ATCC 25922), Pseudomonas aeruginosa (ATCC 49619) and Entamoeba sp. Antimicrobial activities of the plants were determined by using the agar well diffusion and agar well dilution methods. The plant extracts showed activity against all the tested organisms with the zones of inhibition ranging from 4 to 19 mm. All the extracts inhibited the growth of S. aureus while the strongest activity was found for T. bakeri against S. aureus and Entamoeba sp. at 19 mm. Other plant extracts that induced strong antimicrobial activity were the chloroform extract of R. natalensis with an inhibition diameter of 13 mm against both S. aureas and P. aeruginosa and 9 mm diameter inhibition against E. coli. Only T. bakeri showed growth inhibition of S. aureus (4 mm). The minimum inhibitory concentration (MIC) was observed against S. aureus at 0.25 g/ml by the T. bakeri and B. longipes plant extracts. Sterol and triterpenes, fatty acids, flavanoids, coumarins and alkaloids were determined in T. bakeri, B. longipes, R. natalensis and M. lanceolata. The presence of these compounds indicates that the plants may contain an active compound or one that can be used as a template for the development of a new antimalarial or antibiotic medicineItem Antiplasmodial activity of extracts of selected medicinal plants used by local communities in western Uganda for treatment of malaria(African Journal of Ecology, 2007) Katuura, Esther; Waako, Paul; Tabuti, John R. S.; Bukenya-Ziraba, Remigius; Ogwal -Okeng, JasperThis study investigated the antiplasmodial activity of ten medicinal plants used to treat malaria in Southwestern Uganda. The study plants were Bothlioclines longpipes (Olive and Hiern), N.E.Br., Toddalia asiatica (L.) Lam., Maesa lanceolata Forssk., Indigofera emerginella steud. Ex A. Rich., Lantana trifolia L., Vernonia lasiopus O. Hoffm., Trimmeria bakeri Gilg., Rhus natalensis Bernh. ex. Krauss Erythrophleum pyrifolia and Conyza sp. Dry powdered plant material was extracted by sequential cold maceration using petroleum ether, chloroform and ethanol solvents respectively. Extracts were subjected to in vitro antiplasmodial screening against wild strains of Plasmodium falciparum using the nitro-tetrazolium blue-based lactate dehydrogenase assay. The chloroform extract of M. lanceolata (EC50 1.60 μg ml−1.), showed the highest antiplasmodial activity followed by R. natalensis (EC50 1.80 μg ml−1). Other extracts with significant activity were the chloroform leaf extract of Bothriocline longipes (EC50 3.66 μg ml−1) and the petroleum ether root extract of T. bakeri (EC50 3.955 μg ml−1).