ANTIBACTERIAL ACTIVITY OF SELECTED SEAWEEDS FROM KOVALAM SOUTH WEST COAST OF INDIAN.R. BUSHRA BEEGUNI AND T. GANGA DEVI
Bioassays were carried out with extracts of nine algae viz., Bryopsis plumosa, Caulerpa racemosa, Ulva fasciata, Cent roceras clavulatum, Cheliosporium spectabilis, Gracilaria corticata,. Padina tetrastromatica, Sargassum wightii and Chnoospora minima Crude extracts with hexane and ethanol were prepared and tested against gram positive and gram negative bacteria. The ethanol fraction showed considerable activity against gram positive. Staphylococcus aureus and gram negative Escherichia coli and Klebsiella pneumoniae, while the hexane extracts of Phaeophyta registered activity against S. aureus the l,exane extract of P. tetrastromatica among Phaeophyta alone recorded activity against K. pneumoniae. The hexane extracts of Rhodophyta, S. insignis and H. nigrescens exhibited inhibitory effect against E. coli. However, the study revealed that algae with high phenolic content registered high antibiotic activity against gram positive and gram negative bacteria, that caused different kinds of diseases in human beings. Progression of studies in this field will help in the isolation and identification of bioactive compounds from seaweeds responsible for antibacterial activity.
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