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Marine algae are a well-known source of active compounds with many biological activities. Many studieshad point to the anti-microbial and anti-diabetic activity of seaweeds. Egyptian shores are rich withseaweeds, yet studies concerning their biological activity are inadequate. In the present work, the 80%methanolic extract of six seaweeds (Actinotrichia fragilis, Cystoseira myrica, Hormophysa cuneiformis,Laurencia papillosa, Sargassum cinereum, and Turbinaria turbinate) were tested for their antimicrobialactivity using disc diffusion method and anti-diabetic activity using the Inhibition of α-glucosidasemethod. The six species were collected from Hurghada, Red Sea, Egypt during late December, 2012. Theresults should that the algal extracts were effective against both Gram-positive and Gram-negative bacteriawhen used at 2000μg/disc concentration. On Candida albicuns, both low and high concentrations showedactivity. For anti-diabetic activity, H. cuneiformis was the most active species that reached to 53%inhibition of α-glucosidase at the highest concentration (1000 μg/ml) with IC50 676.9 μg/ml. Inconclusion, the tested seaweeds possess a good anti-microbial and anti-diabetic activity, especially thespecies Hormophysa cuneiformis.

Anti-microbial and Anti-diabetic Activity of Six Seaweeds Collected from the Red Sea, Egypt