presence of antimicrobial substances in certain green algae

ABSTRACT

The antimicrobial principles in three algae Chlorella vulgaris, Scenedesmus acutus and Colelastrurm probnscideum were extracted using a successive solvent system. The extracts were bioassayed against three different bacteria. The three algae contained different antimicrobial principles most of which were soluble in ethyl ether. The Gram negative Escherichia coli exhibited high tolerance to the antimicrobial principles compared to the Gram positive Staphylococcus aureus. No stimulating effects were recorded in the examined extracts