Dikdik Kurnia*, Eti Apriyanti, Cut Soraya and Mieke H. Satari Pages 290 - 296 ( 7 )
Background: A significant number of antibiotics are known to inhibit peptidoglycan synthesis in the cross-linking stage, while the drug fosfomycin is the only one known to inhibit MurA. Escalated antibiotic resistance has had an impact on the efficacy of fosfomycin, thus demanding the discovery of suitable substitutes with improved potential for MurA inhibition. The aim of this work is to isolate antibacterial compounds from Sarang Semut (Myrmecodia pendans) and to evaluate their antibacterial activity against pathogenic oral bacteria of Enterococcus faecalis ATCC 29212 and inhibitory activity against MurA enzyme.
Methods: The antibacterial compounds from Sarang Semut were isolated by a bioactivity-guided separation method with various solvents and combination of column chromatography on normal and reverse phases. The compounds with concentrations of 1000 and 5000 ppm were assessed against E. faecalis ATCC 29212 by agar well diffusion method, with chlorhexidine and fosfomycin being used as positive controls.
Results: Two antibacterial compounds isolated from Sarang Semut were identified as two new flavonoids derivates of 1 (10 mg) and 2 (4 mg). Both compounds were tested for antibacterial activities against E. faecalis. MIC values of compounds 1 and 2 were 8.15 and 8.05 mm at 1000 ppm and 8.62 and 8.55 mm at 5000 ppm, respectively. MBC values were 156 and 625 ppm for 1 and 625 and 2500 ppm for 2, respectively. In an inhibitory murA enzyme activity assay, compounds 1 and 2 were shown to inhibit the enzyme activity by IC50 values of 21.7 and 151.3 ppm.
Conclusion: The study demonstrated that ethyl acetate fraction of Sarang Semut contained antibacterial flavonoids as active constituents that showed activity against E. faecalis. These results showed the plant’s potential in herbal medicine and the development of new antibacterial agent for pathogenic dental caries.
Sarang Semut, Myrmecodia pendans, Enterococcus faecalis, MurA enzyme and flavonoids, oral bacteria, PAC.
Department of Chemistry, Faculty of Mathematic and Natural Sciences, Universitas Padjadjaran-Bandung, Sumedang, Department of Chemistry, Faculty of Mathematic and Natural Sciences, Universitas Padjadjaran-Bandung, Sumedang, Department of Concervative Dentistry, Faculty of Dentistry, Syiah Kuala Universty, Banda Aceh, Department of Oral Biology, Faculty of Dentistry, Universitas Padjadjaran-Bandung, Sumedang