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A Study On The Antimicrobial Activity Of New Substituted 1,3,4-Oxadiazole Analogues

Abstract

Substituted 1,3,4-oxadiazole derivatives such as 2-(chloromethyl)-5-heptadecyl-1,3,4-oxadiazole (4a), 2-benzyl-5-heptadecyl-1,3,4-oxadiazole (4b), 2-heptadecyl-5-phenyl-1,3,4-oxadiazole (4c), 2-heptadecyl-5-styryl-1,3,4-oxadiazole (4d), 2-(5-heptadecyl-1,3,4-oxadiazol-2-yl)phenol (4e), 2-heptadecyl-5-o-tolyl-1,3,4-oxadiazole (4f), 2-heptadecyl-5-(4-nitrophenyl)-1,3,4-oxadiazole (4g) and 4-(5-heptadecyl-1,3,4-oxadiazol-2-yl)benzenamine (4h) were subjected to antibacterial and antifungal activity assay by cup diffusion and poisoned food technique against Escherichia coli, Staphylococcus aureus and three strains of seed borne toxigenic Fusarium verticilloides isolated from maize (Zea mays L.) and paddy (Oryza sativa L.). F. verticilloides was confirmed by species specific primers VERT 1 and VERT 2 and fumonisin producing ability was confirmed by VERTF-1 and VERTF-2 using polymerase chain reaction. All the compounds were tested at different concentration (25 to 100 ppm). The results revealed that all eight oxadiazoles completely inhibited all the strains of toxigenic F. verticilloides at 100 ppm indicating Minimal Inhibitory Concentration (MIC). 4b recorded highly significant antibacterial activity against E. coli where as it was 4f against Staph. aureus. The study is successful in reporting the antimicrobial activity of the oxadiazoles and its possible application in management of seed borne fumonisin producing fungi and also bacterial infection in human.

Jayaroopa Prabhashankar, Ajay Kumar Kariyappa, Deepa Nagaraju and Raghavendra Maddur Puttaswamy

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