Abstract
The present study was carried out to make botanical description, chemical analysis, and to evaluate the antibacterial activity of the aqueous extract from Enantia polycarpa (DC) Engl. and Diels stem bark against methicillin resistant Staphylococcus aureus (MRSA) strains isolated from clinical specimen. The methods of agar well diffusion and microbroth dilution in liquid media were used for susceptibility testing and minimum inhibitory concentration (MIC) and minimal bactericidal concentration (MBC) determination. The tests were performed on eleven MRSA strains isolated from patients and one reference (ATCC 25923) strain. Enantia polycarpa (Annonaceae) is used in Africa to treat many diseases. The aqueous extract of this plant showed inhibitory activity against all tested bacteria and described zones of inhibition between 8.33 ± 0.58 mm and 16.33 ± 0.58 mm at 25 mg/ml. The lowest MIC and MBC values were observed with MRSA 564 UB/15(3.125 mg/ml and 12.5 mg/ml, respectively). The aqueous stem bark extract of Enantia polycarpa had a bactericidal activity on 75% of MRSA strains tested. The phytochemical analysis showed the presence of saponins, alkaloids, and tannins in aqueous extract. This could justify the antibacterial activity and the use of Enantia polycarpa stem bark in the treatment of various diseases in traditional society.
Resumé
La présente étude a été effectuée pour faire la description botanique, l’analyse phytochimique et évaluer l’activité antibactérienne de l’extrait aqueux des écorces de tige de Enantia polycarpa (DC) Engl. et Diels contre des souches cliniques de Staphylococcus aureus résistant à la méticilline (SARM) isolées de divers produits biologiques. Les méthodes de diffusion dans les puits et de microdilution en milieu liquide ont été utilisées pour le test de sensibilité et la détermination des CMI et CMB. Les tests ont été exécutés sur 11 souches de SARM isolées de patients et une souche de référence (ATCC 25923). Enantia polycarpa (Annonaceae) est utilisé en Afrique pour traiter plusieurs maladies. L’extrait aqueux de cette plante a montré une activité inhibitrice contre toutes les souches bactériennes testées et induit des zones d’inhibition comprises entre 8,33 ± 0,58 mm et 16,33 ± 0,58 mm à 25 mg/ml. Les valeurs des CMI et CMB les plus basses ont été observées avec SARM 564 UB/15 (3,125 et 12,5 mg/ml). Cet extrait a montré une activité bactéricide sur 75 % de souches de SARM testées. L’analyse phytochimique a montré la présence des saponines, des alcaloïdes et des tanins dans l’extrait aqueux. Cela pourrait justifier l’activité antibactérienne et l’utilisation des écorces de tige de Enantia polycarpa dans le traitement de diverses maladies en usage traditionnel.
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Ambé, A.S.A., Guessennd, N.K., Ouattara, D. et al. Botanical survey, phytochemical investigation, and antibacterial activity of aqueous extract of Enantia polycarpa (DC) Engl. and Diels stem bark against methicillin resistant Staphylococcus aureus (MRSA). Phytothérapie 15, 267–273 (2017). https://doi.org/10.1007/s10298-016-1057-4
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DOI: https://doi.org/10.1007/s10298-016-1057-4