Antimicrobial Activities of Some Selected Marine Cyanobacteria Isolated from Bay of Bengal of Odisha Coast

Author(s): Satyabrata Dash, Sabyasachy Parida and Biswajit Rath

Abstract: Bioactive compounds were found to be extracted from marine cyanobacteria. Many cyanobacteria are known to produce intracellular and extracellular secondary metabolites with diverse biological activity. The characteristics of such metabolites in nature are not yet completely understood. The present study was carried out to observe the antibacterial effect of benzene, acetone and methanol extracts of four marine cyanobacteria (Phormdium ambiguum, Planktolyngbya limnetica, Lyngbya. martentiana, Oscillatoria pseudogeminata) isolated from Odisha coast was tested against few pathogenic bacteria and fungus. The methods adopted is based on agar well diffusion principle using spread plate technique. Antibacterial effects were observed as visible zone of inhibition. The highest zone of inhibition exhibited against E.coli (20±2mm) followed by 18±1mm against V. Cholerae in benzene extract of P. limnetica, whereas least antibacterial activity was observed in benzene extract of L.martensiana against E. coli (11±1mm). The acetone extract of Lyngbya martensiana exhibited highest antifungal zone of inhibition against A. niger (21±1mm) followed by V. Cholera (17±2mm) whereas the acetone extract of L.martensiana exhibited least activity against C.albicans (12±1mm). Further phytochemical analysis exhibited presence of alkaloid, glycoside, tannin, flavanoid, steroid, saponin, resin, quinine, anthocyanin and phenols in all the species. Results indicates the presence of promising antibacterial compounds.

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