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In our pervious study, the ethanol extracts from Eupatorium fortunei Turcz at concentrations of 200 ÷ 500 mg L significantly inhibited the growth of Microcystis aeruginosa, which is the most common species, responsible for toxic cyanobacteria blooming in fresh water. o-Coumaric acid (or 2-hydroxy-cinnamic acid) isolated from E. fortunei was tested its growth-inhibitory effect on M. aeruginosa and Chlorella vulgaris at the concentrations of 1.0, 10.0 and 100.0 mg L in the 96hour experiment by the optical density and the analytical method of chlorophyll a concentration. Results indicated that the compound strongly affected towards M. aeruginosa at the concentration of 100.0 mg L with the inhibition efficiency (IE) values of 76.76 % and 84.66 %, respectively while those for C. vulgaris were lower just of 60.59%, and 74.53 %, respectively. The obtained data demonstrated that two methods were highly consistent and ocoumaric acid was more toxic to M. aeruginosa than C. vulgaris at all tested concentrations (p<0.05). The images of M. aeruginosa and C. vulgaris cells under the light microscope clearly showed the damage of these cells under the attck of o-coumaric acid. Although o-coumaric compound was widely demonstrated antibacterial properties in previous reports, to the best of our knowledge, our study was the first report about effect of ocoumaric acid on the growth of M. aeruginosa and C. vulgaris.

Identification and antialgal properties of o-coumaric acid isolated from Eupatorium fortune Turcz