Objective: To inquire the antibacterial efficacy of various solvent extracts of Marine algae collected from Gulf of Mannar. Methods: Hexane, Chloroform and Ethanol extracts of five Marine algal species at different concentrations were tested in vitro for their antibacterial activities against the following bacteria Staphylococcus aureus, Bacillus cereus, Micrococcus luteus, Escherichia coli, Aeromonas hytrophila with the well diffusion method. A suitable positive control was also maintained. Results: Among the five marine algae screened, the sample Caulerpa recemosa, Turbinaria conoides, and Halimeda micronesica have shown the maximum inhibitory activity. In which, the samples Caulerpa recemosa and Turbinaria conoides were found to be more active against the bacteria Micrococcus luteus. Whereas Halimeda micronesica have shown the maximum inhibitory activity against E-coli. Of all the solvent extracts, Hexane extract of the five marine algae showed higher inhibitory activity against all the selected bacterial species. Conclusion: The hexane extract of Caulerpa recemosa can be used as potential antibacterial sources. Further the investigations are now in progress towards the biological studies.
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