ISOLATION OF SUBSTANCES HAVING BACTERIAL GROWTH INHIBITION FROM MARINE ALGAEG. MALATHI, S. ARUNPRAKASH, M. ARUL KUMAR, A. BASKARA BOOPATHY AND P. RAMAAbstract Ethanolic extracts of 22 different macro-algae were screened for the presence bacterial inhibition substance against the positive and negative bacteria. Among them, five species of Chlorophyta (Green algae), each nine species of Phaephyta (Brown algae) and Rhodophyta (Red algae) were examined for antibacterial activity by applying a microtiter plate assay. Caulerpapeltata, green algae, showed maximum percentage of inhibition on Staphylococcus aureus and Escherichia coli. In brown seaweeds, Sargassum polycystum, Sargassum plagiophyllum, Padinagymnospora and Padinatetrastromatica were more control towards positive and negative bacterial growth. The red algae, Champiaparvula and Chondrococcus hornemanni are recorded maximum growth arrest on S. aureus and E. coli. The finding envisages that ethanolic extracts of seaweeds could be utilized as a reliable source of pharmaceutical therapy for the treatment .
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