alexa The Effect of Selected Combretum Species from Zimbabwe
ISSN: 1948-5948

Journal of Microbial & Biochemical Technology
Open Access

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Research Article

The Effect of Selected Combretum Species from Zimbabwe on the Growth and Drug Efflux Systems of Mycobacterium aurum and Mycobacterium smegmatis

Ruvimbo Magwenzi, Colet Nyakunu and Stanley Mukanganyama*

Department of Biochemistry, University of Zimbabwe, Mt. Pleasant, Harare, Zimbabwe

*Corresponding Author:
Dr. Stanley Mukanganyama
Biomolecular Interactions Analyses Group
Department of Biochemistry, University of Zimbabwe
P.O. Box MP 167, Mt. Pleasant Harare, Zimbabwe
Tel: 263-4-2917638/09
E-mail: [email protected], [email protected]

Published date: April 15, 2014; Published date: May 07, 2014; Published date: May 14, 2014

Citation: Magwenzi R, Nyakunu C, Mukanganyama S (2014) The Effect of Selected Combretum Species from Zimbabwe on the Growth and Drug Efflux Systems of Mycobacterium aurum and Mycobacterium smegmatis. J Microbial Biochem Technol S3:003. doi:10.4172/1948-5948.S3-003

Copyright: © 2014 Magwenzi R, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited



Treatment of tuberculosis has become a challenge due to the rapid increase of multidrug and extensive drug resistant Mycobacterium tuberculosis. Medicinal plants might represent a possible source for new potent antibacterials to which pathogen strains are not resistant. In this study, five Combretum plant species-Combretum imberbe, Combretum zeyheri, Combretum hereroense, Combretum elaeagnoides and Combretum platypetalum used in traditional medicine were exposed to susceptibility tests to determine the effects of drug accumulation in avirulent M. smegmatis and M. aurum. The MIC values of the potent plant species was then determined. Using the agar disc diffusion assay, it was found out that the only the ethanolic extract from Combretum imberbe was active on M. smegmatis and it had an MIC of 125 μg/ml in the broth microdilution assay. However, using Sabouraud dextrose broth, Combretum platypetalum was found to have antimycobacterial effects which were not detected when using the agar disc diffusion assay. MIC of 63 and 125 μg/ml and MBCs of 250 and 500 μg/ml were obtained for C. platypetalum for M. smegmatis and M. aurum respectively. C. imberbe extract gave an MIC of 125 μg/ml but did not produce MBCs suggesting that it is bacteriostatic and not bactericidal. Drug accumulation transport assays were performed on C. imberbe, C. hereroense and C. platypetalum and results show that extracts from two plants are efflux pump inhibitors. Determination of the IC50 for the transport process was as conducted on Combretum imberbe using CCCP as the standard inhibitor. Both plants extract in addition to C. hereroense maybe potential sources for leads for efflux pump inhibitor in mycobacteria.


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