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Abstract
In this study, antibacterial activities of four seaweeds (Pterocladia capillacea, Corallina mediterranea, Corallina officinalis, and Ulva lactuca) collected from Abu-Qir, Alexandria, Egypt during summer 2016. Their methanol/chloroform extracts were tested against four Gram-positive bacteria (Staphylococcus aureus, Staphylococcus epidermidis, Streptococcus sp. and Bacillus cereus, and two Gram-negative bacteria (Salmonella enterica, Proteus mirabilis). The results revealed that the number of algal extracts inhibited Bacillus cereus. On the other hand, no effect was shown on Proteus mirabilis. The n-Hexadecanoic acid was a fatty acid which recorded as active compound in Pterocladia capillacea extract was characterized by GC-MS analysis.
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