Chemical composition and antibacterial activity of extracts of freshwater green algae, Cladophora glomerata Kützing andMicrospora floccosa (Vaucher) Thuret

Abstract

Freshwater macroalgae, Cladophora glomerata Kützing and Microspora floccosa (Vaucher) Thuret, harvested from Nan River in northern Thailand, were extracted with hexane, ethyl acetate, methanol and hot water. The extracts were screened for antibacterial activities. Hexane and ethyl acetate extracts of both algae showed the activities against Bacillus cereus and Vibrio parahaemolyticus. The extracts were further separated using column chromatography and chemically characterized by GC–MS in order to be tentative identify the compounds responsible for such activities. The main compositions were fatty acid and other organic compounds, in which have not been reported in these algae. These results indicate that extracts of C. glomerata and M. floccosa exhibited appreciable antimicrobial activity and could be a source of valuable bioactive materials for health products