Natural Product Research p. 1142 - 1149 (2011)
Update date:2022-08-11
Topics:
Abourashed, Ehab A.
Galal, Ahmed M.
Shibl, Atef M.
The aim of this study was to investigate the antimycobacterial activity of the major daucane constituent, ferutinin (jaeschkeandiol p-hydroxybenzoate, 1), four of its natural analogues, its hydrolysis products, as well as methyl p-hydroxybenzoate (methylparaben) against Mycobacterium smegmatis, a rapidly growing surrogate of Mycobacterium tuberculosis. The agar dilution assay was utilised for an antimycobacterial evaluation of single compounds. A modified agar dilution assay, the checkerboard method, was utilised for evaluating the potentiating effect of 1 on different antitubercular drugs, namely isoniazid, ethionamide, rifampin and streptomycin. In the agar dilution assay, 1 exhibited higher potency (minimum inhibitory concentration [MIC] 10μgmL-1) than streptomycin and rifampin (MIC 20 μg mL-1 for each). Of the natural analogues, 8,9-epoxyjaeschkeandiol phydroxybenzoate and 8,9-epoxyjaeschkeandiol benzoate exhibited marginal activity (MIC ≥ 40 and 80μgmL-1, respectively). The checkerboard method showed that the combination of 1 with each antitubercular drug led to mutual enhancement of the antimycobacterial activity with isoniazid and ethionamide, while no such effect was observed with rifampin or streptomycin. Based on this study and earlier studies with Staphylococcus aureus, the major constituent 1 may be responsible for the major part of the antimicrobial activity of the root of Ferula hermonis.
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