Abstract
Lomefloxacin (LOM) is a synthetic antimicrobial from the fluoroquinolone family (FQ) used as a veterinary and human drug. Once in the environment, LOM may pose a risk to aquatic and terrestrial microorganisms due to its antimicrobial activity. This study evaluated the effect of ozonation of LOM (500 μg L−1), the residual antimicrobial activity against Escherichia coli and acute toxicity against Vibrio fischeri. In addition, degradation products were investigated by UHPLC-MS/MS and proposed. Ozonation was carried out varying the applied ozone dose from 0 to 54.0 mg L−1 O3 and pH values of 3, 7, and 11. Ozonation was most efficient at pH 11 and led to 92.8% abatement of LOM in a 9-min reaction time (54.0 mg L−1 O3 applied ozone dose). Ozonation at pH 3 was able to degrade 80.4% of LOM. At pH 7, 74.3% of LOM was degraded. Although the LOM concentration and the antimicrobial activity of the solution dropped as ozone dose increased (antimicrobial activity reduction of 95% at pH 11), toxicity to V. fischeri increased for pH 7 and 11 (i.e., 65% at pH 7 and 75% at pH 11). The reduction in antimicrobial activity may be related to the oxidation of piperazinyl and the quinolone moiety. The formation of intermediates depended on the oxidant (hydroxyl radicals or/and molecular O3) that acted the most in the process.
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The authors gratefully acknowledge the financial support from FAPESP (2013/04656-8 and 2013/09543-7) and CNPq (459078/2014-3 and 479131/2013-9). M.G. Maniero and C. Rodrigues-Silva acknowledge FAPESP (2013/07817-2 and 2014/16622-3).
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de Oliveira, A.M.D., Maniero, M.G., Rodrigues-Silva, C. et al. Antimicrobial activity and acute toxicity of ozonated lomefloxacin solution. Environ Sci Pollut Res 24, 6252–6260 (2017). https://doi.org/10.1007/s11356-016-8319-0
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DOI: https://doi.org/10.1007/s11356-016-8319-0