Abstract
Antialgal bioactive compounds were extracted from macrophyte (Egeria densa, Cabomba caloliniana, Myriophyllum spicatum) with methanol (MeOH). The MeOH extract was fractionated on the basis of polarity and molecular weight. Each fraction was assayed for algae (Selenastrum capricornutum and Microcystis aeruginosa). Microbial degradability of antialgal bioactive compounds was also investigated.
Algal growth was inhibited by the most polar fraction of the MeOH extract, and its fractionation on the basis of molecular weight showed that algal growth inhibition was caused by substances whose molecular weight were below 1,000. The lowly polar fraction extracted from Myriophyllum spicatum inhibited growth of M. aeruginosa, while growth of S. capricornutum was not affected. It was also shown that the antialgal bioactive compounds were easily degraded in the condition of coexistence with heterotrophic bacteria.
