In the present study, Searching for new non toxic antifouling paints have been compared among Ulva fasciata, padina gymnospora and Helimeda macroloba and Halymenia floresia. The seaweeds were extracted with three organic solvents namely methanol, dichloromethane and hexane. The test marine diatoms such as Fragilaria oceanica, Coscinodiscus centralis and Chaetoceros curvisetus were isolated from the retrieved teak wood panel. The crude methanol, dichloromethane and hexane extracts of the U. fasciata, P. gymnospora, H. macroloba and H. floresia were tested against the isolated marine diatoms. Among the extracts, the methanolic extract of P. gymnospora inhibited all the test marine diatoms with the minimum inhibitory concentration (MIC) of 25 µg/ml. Thin Layer Chromatography (TLC) profile of the crude extract showed the presence of one bioactive compound with the Rf value of 0.67. This is an incipient investigation which will further the understanding of naturally occurring products for their potential use in antifouling technology.
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