Anti-bacterial effect of Madracis sp. and Palythoa tuberculosa soft coral extracts from Chabahar coasts

Nowadays due to the bacterial resistance to antibiotics, the need to new materials with antibacterial properties, including bioactive compounds from marine organisms such as corals with antibacterial properties, is more notable. So this study was conducted to evaluate the antibacterial effects of the methanolic, hydroethanolic and n-hexanic extracts of two soft marine coral Madracis sp. and Palythoa tuberculosa. After sampling, n-hexanic, methanolic and hydroethanolic extracts of two coral species of Madracis sp. and Palythoa tuberculosa was prepared. Then the disk diffusion method was used in order to determination the antibacterial activity against the three strains of Gram-negative bacterium include Vibrio cholera, Proteus vulgaris and Escherichia coli and two Gram-positive bacteria, Staphylococcus aureus and Listeria monocytogenes, and the results were compared with the standard antibiotic erythromycin. The analysis of the results was conducted by using one-way ANOVA whit SPSS software. The methanolic and hydroethanolic extracts of Madracis sp. corals had the highest effect on E. coli bacteria, with the inhibition zone of 12.94±9.0 and 16.58±0.53 mm, respectively. In all the extracts prepared from Palythoa tuberculosa Coral, standard antibiotic had more significant effect against the bacteria. The extracts of Madracis sp. coral has high antimicrobial properties.