Degradation of flumequine by the Fenton and photo-Fenton processes: Evaluation of residual antimicrobial activity

Author(s)

Rodrigues-Silva, Caio ^[1] ; Maniero, Milena Guedes ^[1] ; Rath, Susanne ^[2] ; Guimaraes, Jose Roberto ^[1]

Affiliation

^[1] Univ Campinas UNICAMP, Sch Civil Engn Architecture & Urbanism, BR-13083852 Campinas, SP - Brazil

^[2] Univ Campinas Unicamp, Inst Chem, BR-13084971 Campinas, SP - Brazil

• Document type: Journal article
• Source: Science of The Total Environment; v. 445, p. 337-346, FEB 15 2013.
• Web of Science Citations: 23

Abstract

Flumequine is a broad-spectrum antimicrobial agent of the quinolone class, and it is widely used as a veterinary drug in food-producing animals. The presence of flumequine in the environment may contribute to the development of drug resistant bacterial strains. In this study, water samples fortified with flumequine (500 mu g L-1) were degraded using the Fenton and photo-Fenton processes. The maximum degradation efficiency for flumequine by the Fenton process was approximately 40% (05 mmol L-1 Fe(II), 2.0 mmol L-1 H2O2 and 15 min). By applying UV radiation (photo-Fenton process), the efficiency reached more than 94% in 60 min when 025 mmol L-1 Fe(II) and 10.0 mmol L-1 H2O2 were used. Under these conditions, the Fenton process was able to reduce the biological activity, whereas the photo-Fenton process eliminated almost all of the antimicrobial activity because it was not detected. Four byproducts with an m/z of 244, 238, 220 and 202 were identified by mass spectrometry, and a degradation pathway for flumequine was proposed. The byproducts were derived from decarboxylation and defluorination reactions and from modifications in the alkylamino chain of the fluoroquinolone. (C) 2013 Elsevier B.V. All rights reserved. (AU)

• FAPESP's process: 08/06470-0 - DEGRADATION OF VETERINARY DRUGS
• Grantee: José Roberto Guimarães
• Support Opportunities: Regular Research Grants