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Chloroform extracts,  n- butanol extracts, water extracts, and volatile compounds from seven species belonging to six Black Sea genera of brown algae and 10 species belonging to seven Black Sea genera of red algae were assessed for antibacterial, antiviral, and cytotoxic properties. Most of the extracts showed pronounced effects against the Gram (+) bacterium  Staphylococcus aureus . Activity towards the Gram (-) bacterium  Escherichia coli  was found in only few cases. A significant reduction in replication of influenza and  Herpes simplex  viruses in cell cultures was observed. Cytotoxic effect was established in a significant proportion of the algae investigated. The biological activities may be attributed to the presence of volatile compounds, some phenols, free fatty acids and their oxidized derivatives, eucalyptol, the methyl ester of phenyl acetic acid, and 1,2-dihydroxy ethane sulfonate.

Antibacterial, antiviral, and cytotoxic activities of some red and brown seaweeds from the Black Sea