<p>In this study, the antioxidant, antimicrobial, and cytotoxic activities of <em>Codium bursa, Codium effusum</em>, <em>Laurencia</em> <em>obtusa</em> and <em>Padina</em> <em>pavonica </em>from the Adriatic Sea were investigated. The antioxidant activities were characterized by the DPPH (1,1-diphenyl-2-picrylhydrazyl) method and their total phenolic and flavonoid contents were quantified. The antimicrobial activity of four species against 8 pathogenic bacteria: <em>Staphylococcus aureus</em>, <em>Bacillus</em> <em>cereus</em>, <em>Micrococcus</em> <em>luteus</em>, <em>Listeria</em> <em>monocytogenes</em>, <em>Pseudomonas</em> <em>aeruginosa</em>, <em>Salmonella</em> <em>Typhimurium</em>, <em>Escherichia</em> <em>coli</em>, <em>Enterobacter</em> <em>cloacae</em> and 8 fungi: <em>Aspergillus</em> <em>fumigatus</em>, <em>Aspergillus versicolor</em>, <em>Aspergillus ochraceus</em>, <em>Aspergillus niger</em>, <em>Trichoderma</em> <em>viride</em>, <em>Penicillium</em> <em>funiculosum</em>, <em>Penicillium ochrochloron</em> and <em>Penicillium verrucosum</em> var. <em>cyclopium</em>) were used. The antitumor activities were determined using two different tumor cell lines (HeLa and K562). The results have shown potential antioxidant activity of <em>Padina pavonica</em>, antibacterial and antifungal activity of <em>Codium effusum</em>, and strong cytotoxic activity of <em>Laurencia</em> <em>obtusa</em>. </p>
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