INHIBITORY EFFECT OF DIFFERENT EUPATORIUMFORTUNEI TURCZ EXTRACTS ON THE GROWTH OF MICROCYSTIS AERUGINOSA

Pham Thanh Nga

Abstract


Blooms of freshwater cyanobacteria have caused increasing eco-environmental problems in recent years. Recently, plant extracts have been considered as attractive alternative algicides for algal bloom treatment. The present work presented the effect of three different extracts (ethanol, water and methanol) prepared from Eupatorium fortunei Turcz at concentrations of 500 and 200 µg/mL on the growth of Microcystisaeruginosain a 10-day experiment. By using optical density method, the ethanol extract at concentration of 500 µg/mL indicated the highest toxicity with the inhibition efficiency reaching 95.5 % after 10 days which was significantly greater than those of the water, methanol extracts at the same concentration and that of CuSO4 at 5 µg/mL (59.7 %, 66.5 % and 81,7 %, respectively). In addition, the pH of the algal suspensions was fluctuated from 6.0 to 7.0 for the control and extract-treated samples. In contrast, the pH of the CuSO4-treated suspension decreased to 5.0 - 5.5. These results proved that the E. fortunei Turcz ethanol extract had the best properties at 500 µg/mL in comparision with other extracts.


Keywords


Eupatorium fortunei Turcz, algal bloom, Microcystisaeruginosa inhibition, plant extracts.

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DOI: https://doi.org/10.15625/2525-2518/55/4C/12137 Display counter: Abstract : 175 views. PDF : 158 views.

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Published by Vietnam Academy of Science and Technology