Abstract
Three samples of iron oxide nanoparticles (Fe3O4-NPs) were successfully synthesized using Sargassum vulgare, Ulva fasciata and Jania rubens aqueous extract for reducing ferric chloride and stabilizing the formed Fe3O4-NPs. The biosynthesized Fe3O4-NPs were characterized using the standard methods. The antibiofilm activity of the selected seaweed and their biosynthesized Fe3O4-NPs against marine bacterial biofilm was examined in vitro. Fe3O4-NPs showed better antibiofilm efficiency than the tested seaweed themselves for both steel and wood treatments. The best treatment was Fe3O4-NPs synthesized by S. vulgare followed by that synthesized by J. rubens and U. fasciata. With respect to the tested seaweed, J. rubens showed the highest antibiofilm activity followed by S. vulgare and U. fasciata. The effect of bacterial biofilm formed on the unprimed steel and wood coated panels on the chemical parameters of the contacted seawater was also studied.
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