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Inhibitory Effect and Antimicrobial Activity of Secondary Metabolites of Khaya Senegalensis (Desr.) A. Juss. (Meliaceae)
Science Journal of Chemistry
Volume 8, Issue 4, August 2020, Pages: 81-94
Received: Aug. 3, 2020; Accepted: Aug. 21, 2020; Published: Sep. 17, 2020
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Yves Oscar Ditchou Nganso, Department of Chemistry, University of Maroua, Maroua, Cameroon
Emmanuella Marthe Satchet Tchana, Department of Organic Chemistry, University of Yaoundé I, Yaoundé, Cameroon
Alex Doutsing Kahouo, Department of Chemistry, University of Maroua, Maroua, Cameroon
Ange Gabrielle à Ngnoung Amang, Department of Chemistry, University of Maroua, Maroua, Cameroon
Kombo Abah, Department of Chemistry, University of Maroua, Maroua, Cameroon
Hermann Fomena, Department of Chemistry, University of Maroua, Maroua, Cameroon
Hamadou Mamoudou, Department of Biological Sciences, University of Maroua, Maroua, Cameroon; National Advanced School of Engineering of Maroua, University of Maroua, Maroua, Cameroon
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This present study investigates the in vitro inhibitory effect and antimicrobial activity of secondary metabolites isolated from the roots of Khaya senegalensis, a plant of the Meliaceae family. Khaya senegalensis is widely used in traditional medicine for the treatment of various illnesses such as: fever, stomach ache, diarrhea, dysentery and anemia. The chemical study of the extract with CH2Cl2-MeOH (1:1) led to the isolation of five compounds: Alphitolic acid (1); Epigouanic acid (2); Methyl angolensate (3); Rohituca-3 (4) and 5, 6, 7, 3′, 4′-pentamethoxyflavone or Sinensetin (5). Alphitolic acid (1), Rohituca-3 (4) and 5, 6, 7, 3′, 4′-pentamethoxyflavone or Sinensetin (5) were isolated from the roots of this plant for the first time. The structures of the isolated compounds have been elucidated on the basis of spectroscopic analysis and a comparison of their spectral data with those reported in the literature. The results of the antibiogram tests showed that the strain of Escherichia coli is sensitive to all the antibiotics tested except Ceftazidime, a Cephalosporin. The Staphylococcus aureus strain is resistant to almost all the antibiotics tested except Amikacin, an aminoglycoside. This is because the enzymes diffuse through the inter and intraspecific transmission of genes through a plasmid. The antibiogram made it possible to establish the sensitivity profile of the strains tested with regard to certain antibiotics. The antimicrobial tests carried out showed that the inhibitory effect of the compounds isolated from Khaya senegalensis on the four bacterial strains tested at the concentration of 25 mg/mL positively influenced at least one of the microbial strains. However, compounds 1, 2 and 3 did not show any bacterial growth inhibitory activity against Proteus vulgaris. MIC obtained for microbiological tests varied between 0.097 and 0.195 mg/mL for the most sensitive strains of Escherichia coli and Pseudomonas aeruginosa, which revealed the highest antibacterial powers. Furthermore, these results therefore show a great variability in the bacteriostatic qualities of the compounds with respect to the different strains. The two Gram-positive strains of Staphylococcus aureus are more sensitive than the other Gram-negative bacterial strains tested. From the antibacterial activity, it appears that the compounds isolated from this plant have a bactericidal activity against Escherichia coli and Pseudomonas aeruginosa. This bactericide could justify their use in herbal medicine against bacterial infections.
Inhibitory Effect, Antimicrobial Activity, Secondary Metabolites, Khaya senegalensis, Meliaceae
To cite this article
Yves Oscar Ditchou Nganso, Emmanuella Marthe Satchet Tchana, Alex Doutsing Kahouo, Ange Gabrielle à Ngnoung Amang, Kombo Abah, Hermann Fomena, Hamadou Mamoudou, Inhibitory Effect and Antimicrobial Activity of Secondary Metabolites of Khaya Senegalensis (Desr.) A. Juss. (Meliaceae), Science Journal of Chemistry. Vol. 8, No. 4, 2020, pp. 81-94. doi: 10.11648/j.sjc.20200804.13
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This article is an open access article distributed under the Creative Commons Attribution License ( which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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