Antibacterial activities of methanolic extracts of different seaweeds from Iskenderun Bay, Turkey

Abstract

Antibacterial activities of the methanolic extracts of Stypopodium schimperi (Kützing) Verlaque and Boudouresque, Halopteris filicina (Grateloup) Kützing, Dictyota dichotoma (Hudson) J.V.Lamouroux, Gracilaria bursa-pastoris (S.G.Gmelin) P.C.Silva, Ulva intestinalis Linnaeus species from the Iskenderun Bay, Turkey against Escherichia coli, Bacillus cereus, Staphylococcus aureus, Pseudomonas aeruginosa, Klebsiella pneumoniae, Salmonella typhimurium and Proteus vulgaris were evaluated by using the microdilution method. Results of the study showed that all of the extracts had an antimicrobial effect on the tested bacteria. A minimum inhibitor concentration and minimum bactericidal concentrations of the extracts ranged from >125 to <0.39 mg mL-1. Furthermore, this is the first report on antibacterial effects of the methanolic extracts of S. schimperi (Kützing) Verlaque and Boudouresque and G. bursa-pastoris (S.G.Gmelin) P.C.Silva species. The present findings revealed that all studied seaweed species could act as a natural source of bioactive compounds for the treatment of infectious diseases.