Antibacterial activity of Sargassum cristaefolium and Dictyota cervicornis against to bacteria

BACKGROUND Nowadays the treat infection of bacterial diseases faced limitations because of the harm of industrial artificial antibiotics for the digestive system and immune system. Consequently, the scientists seek to replace conventional anti-biotics whit natural ones.AIM OF STUDY The central thesis of this study is to identify potential antimicrobial properties of the Sargassum cristaefolium and Dictyota cervicornis extracts.MATERIAL AND METHOD Water-methanol, n-hexane, Ethyl acetat, methanol and water extracts of two marine macroalgae from chahbahar bay (Iran) were weighed up in terms of antimicrobial activity by Agar disk diffusion, MIC and MBC methods against (L.monocytogens as gram-positive bacteri, and (E.coli and P. aeruginosa as gram-negative bacteria).RESULTS According to the obtained results, the hot water extract in S. cristaefolium and D.cervicornis none of the strains examined is of antibiotic effects. Ethyl acetat extract in comparison with other extracts displayed better antibacterial activity (P<0.05). Highest zone of inhibition (14 mm) was recorded for Ethyl acetat extract of S. cristaefolium contrary to L. monocytogenes. Maceration method extracts did not display any effect towards the studied bacteria.CONCLUSION For extracting antimicrobial compounds, the ultrasound method was a successful method.