الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
The brown seaweed Sargassum latifolium was the predominant macroalgal species in Ras Sudr shores, Red Sea Coast, Egypt. The optimal physicochemical properties of Red Sea water were investigated. The biochemical composition (carbohydrates and protein) of Sargassum latifolium was determined. Qualitative analysis of S. latifolium aqueous extract revealed the presence of terpenoids, steroids, flavonoids, phenols, coumarins, and quinones. Whereas tannins, saponins, glycosides, and alkaloids are absent. UV scans analysis of S. latifolium aqueous extract showed peaks at 294 nm which was attributed to flavonoids and phenolic derivatives. FT–IR analysis of S. latifolium revealed the presence of a variety of functional groups such as - OH, -NH, -CH, -COOH, CO, and C – C. The moisture and ash content of S. latifolium were determined. Extraction of alginate from S. latifolium and also, its physical and chemical characterization were investigated. UV scan analysis of alginate and aqueous extract silver nanoparticles showed peaks at 413 and 450 nm respectively. FTIR analysis confirmed the formation of silver nanoparticles.Transmission electron microscope was applied to characterize the nanoparticles size and shape. The alginate silver nanoparticles recorded maximal antibacterial activity against P. aeruginosa, S. aureus, K. pneumonia, E. coli, B. subtilis and B. cereus followed aqueous extract nanoparticles, alginate and aqueous extract. Biosorption capacity of Fe+2 by alginate nanoparticles greater than aqueous extract nanoparticles, alginate and aqueous extract. The optimal condition for bioadsorption of Fe+2 were pH 4, contact time 150 min and adsorbent dose 0.01 g. Biosorption capacity of malachite green dye by alginate nanoparticles greater than aqueous extract nanoparticles, alginate and aqueous extract. Langmuir and freundlish adsorption isotherm were applied.