الفهرس 
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Abstract
Marine macroalgae are, commonly known as seaweed, one of nature’s most biologically active resources, as they possess a wealth of bioactive compounds. Many marine macroalgae have been used as ingredients in both medicinal and food preparations, traditionally, in different regions across the world. The aim of work was to evaluate the nutritional composition and antioxidant activity of five seaweeds (Dictyota divaricata, Padina tetrastromatica, Sargassum subrepandum and Turbinaria triquetra from Phaeophyta and Caulerpa serrulata from Chlorophyta) from Red Sea that had been collected during the winter of 2008 by measuring moisture, ash, Protein, carbohydrates, lipids, fibers and minerals. Some compounds with biological activity were estimated. Antioxidants activity of the seaweeds ethanol extract estimated by two methods B-carotene bleaching and DPPH assays. Antimicrobial activity of three algal extracts (ethanol, dichloromethane, ethyl acetate) was examined on four microorganisms by spot diffusion method. The study indicated that the five seaweeds present a good food source and possess bioactive compounds with both antioxidant and antimicrobial activity.