Antibacterial activity from marine microalgae in laboratory culture

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Abstract
Culture supernatants and methanolic and hexane extracts of 132 marine microalgae have been screened against six strains of bacteria. In vitro antibacterial activity was detected in 28 of the organic solvent extracts, primarily those of the hexane. The extracts were most effective against Staphylococcus aureus and to a lesser extent Bacillus subtilis. No antimicrobial activity was detected in the culture supernatants and no extract inhibited the growth of Escherichia coli, Streptococcus faecalis, Klebsiella pneumoniae or Pseudomonas aeruginosa.