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Antibacterial and antifungal activities of extracts of combretum molle.
Ethiop Med J 2006; 44(3):269-77EM

Abstract

OBJECTIVE

In traditional medical practices of Ethiopia the aqueous extracts obtained from the stem bark of Combretum molle (R. Br. Ex. G. Don.) Engl & Diels (Combretaceae) have a longstanding reputation for the treatment of liver diseases malaria and tuberculosis. Owing to the widespread traditional uses of this plant, the studyinvestigated the antimicrobial activity the bark extract of this plant against Gram positive and and Gram negative bacteria.

METHODS

Petroleum ether, dichloromethane and acetone fractions of the bark of the plant were prepared by soxhlet extraction and screened for their antimicrobial activity. The acetone fraction exhibited a powerful activity and was therefore further tested against twenty-one bacterial and six fungal strains. The minimum inhibitory concentration (MIC) of this extract was determined by checker board technique using nutrient agar medium. The zones of inhibition produced by the extract against bacteria and fungi were determined and compared by disc diffusion technique with those of pure ciprofloxacin and griseofulvin, respectively.

RESULTS

The highest antibacterial action of the acetone extract was against the Gram negative organisms EscherIchia coli and Shigella spp with an MIC value of 50 mg/ml. The activity of the extract against these bacteria was comparable to that of ciprofloxacin when assessed by the disc diffusion technique. Among the fungal strains tested Candida albicans showed high susceptibility to the extract and growth was completely inhibited at a concentration of 400 microg/ml. At the same concentration, the acetone extract and the standard antifungal drug griseofulvin produced comparable zones of inhibition on C. albicans. Studies on the mode of action of the extract indicated that it was bactericidal and fungicidal. The antimicrobial activity of the extract was attributed to the high amount of hydrolysable tannins present in the bark of the plant.

CONCLUSION

The acetone extract of the stem bark of C. molle has the potential for use as a natural antimicrobial agent. Further in vivo antimicrobial, phytochemical and toxicological studies are requireed to evaluate the chemotherapeutic effect of the plant.

Authors+Show Affiliations

Department of Pharmacognosy, School of Pharmacy, Addis Ababa University, P.O. Box 1176, Addis Ababa, Ethiopia.No affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

17447394

Citation

Asres, Kaleab, et al. "Antibacterial and Antifungal Activities of Extracts of Combretum Molle." Ethiopian Medical Journal, vol. 44, no. 3, 2006, pp. 269-77.
Asres K, Mazumder A, Bucar F. Antibacterial and antifungal activities of extracts of combretum molle. Ethiop Med J. 2006;44(3):269-77.
Asres, K., Mazumder, A., & Bucar, F. (2006). Antibacterial and antifungal activities of extracts of combretum molle. Ethiopian Medical Journal, 44(3), pp. 269-77.
Asres K, Mazumder A, Bucar F. Antibacterial and Antifungal Activities of Extracts of Combretum Molle. Ethiop Med J. 2006;44(3):269-77. PubMed PMID: 17447394.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Antibacterial and antifungal activities of extracts of combretum molle. AU - Asres,Kaleab, AU - Mazumder,Avijit, AU - Bucar,Franz, PY - 2007/4/24/pubmed PY - 2007/5/30/medline PY - 2007/4/24/entrez SP - 269 EP - 77 JF - Ethiopian medical journal JO - Ethiop. Med. J. VL - 44 IS - 3 N2 - OBJECTIVE: In traditional medical practices of Ethiopia the aqueous extracts obtained from the stem bark of Combretum molle (R. Br. Ex. G. Don.) Engl & Diels (Combretaceae) have a longstanding reputation for the treatment of liver diseases malaria and tuberculosis. Owing to the widespread traditional uses of this plant, the studyinvestigated the antimicrobial activity the bark extract of this plant against Gram positive and and Gram negative bacteria. METHODS: Petroleum ether, dichloromethane and acetone fractions of the bark of the plant were prepared by soxhlet extraction and screened for their antimicrobial activity. The acetone fraction exhibited a powerful activity and was therefore further tested against twenty-one bacterial and six fungal strains. The minimum inhibitory concentration (MIC) of this extract was determined by checker board technique using nutrient agar medium. The zones of inhibition produced by the extract against bacteria and fungi were determined and compared by disc diffusion technique with those of pure ciprofloxacin and griseofulvin, respectively. RESULTS: The highest antibacterial action of the acetone extract was against the Gram negative organisms EscherIchia coli and Shigella spp with an MIC value of 50 mg/ml. The activity of the extract against these bacteria was comparable to that of ciprofloxacin when assessed by the disc diffusion technique. Among the fungal strains tested Candida albicans showed high susceptibility to the extract and growth was completely inhibited at a concentration of 400 microg/ml. At the same concentration, the acetone extract and the standard antifungal drug griseofulvin produced comparable zones of inhibition on C. albicans. Studies on the mode of action of the extract indicated that it was bactericidal and fungicidal. The antimicrobial activity of the extract was attributed to the high amount of hydrolysable tannins present in the bark of the plant. CONCLUSION: The acetone extract of the stem bark of C. molle has the potential for use as a natural antimicrobial agent. Further in vivo antimicrobial, phytochemical and toxicological studies are requireed to evaluate the chemotherapeutic effect of the plant. SN - 0014-1755 UR - https://www.unboundmedicine.com/medline/citation/17447394/Antibacterial_and_antifungal_activities_of_extracts_of_combretum_molle_ L2 - https://medlineplus.gov/herbalmedicine.html DB - PRIME DP - Unbound Medicine ER -