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Novel treatment of Microcystis aeruginosa using chitosan-modified nanobubbles

Authors
Nam, GwiwoongMohamed, Mohamed M.Jung, Jinho
Issue Date
1-1월-2022
Publisher
ELSEVIER SCI LTD
Keywords
Alga; Chitosan; Cyanobacteria; Hydroxyl radical; Nanobubble
Citation
ENVIRONMENTAL POLLUTION, v.292
Indexed
SCIE
SCOPUS
Journal Title
ENVIRONMENTAL POLLUTION
Volume
292
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/136536
DOI
10.1016/j.envpol.2021.118458
ISSN
0269-7491
Abstract
In this study, we treated harmful Microcystis aeruginosa cyanobacteria using chitosan-modified nanobubbles. The chitosan-modified nanobubbles (255 +/- 19 nm) presented a positive zeta potential (15.36 +/- 1.17 mV) and generated significantly (p < 0.05) more hydroxyl radicals than the negatively charged nanobubbles (-20.68 +/- 1.11 mV). Therefore, the interaction between the positively charged chitosan-modified nanobubbles and negatively charged M. aeruginosa (-34.81 +/- 1.79 mV) was favored. The chitosan-modified nanobubble treatment (2.20 x 10(8) particles mL(-1)) inactivated 73.16% +/- 2.23% of M. aeruginosa (2.00 x 10(6) cells mL(-1)) for 24 h without causing significant cell lysis (<= 0.25%) and completely inhibited the acute toxicity of M. aeruginosa toward Daphnia magna. The inactivation was correlated (r(2) = 0.97) with the formation of reactive oxygen species (ROS) in M. aeruginosa. These findings indicated that the hydroxyl radicals generated by the chitosan-modified nanobubbles disrupted cell membrane integrity and enhanced oxidative stress (ROS formation), thereby inactivating M. aeruginosa. Moreover, the penetration of the chitosan-modified nanobubbles and cell alterations in M. aeruginosa were visually confirmed. Our results suggested that the chitosan-modified nanobubble treatment is an eco-friendly method for controlling harmful algae. However, further studies are required for expanding its practical applications.
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JUNG, Jin ho
생명과학대학 (환경생태공학부)
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