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Degradation of benzimidazoles by photoperoxidation: metabolites detection and ecotoxicity assessment using Raphidocelis subcapitata microalgae and Vibrio fischeri

  • Advanced Oxidation/Reduction Technologies: An Perspective from Iberoamerican Countries
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Abstract

Benzimidazoles (BZ) are among the most used drugs to treat parasitic diseases in both human and veterinary medicine. In this study, solutions fortified with albendazole (ABZ), fenbendazole (FBZ), and thiabendazole (TBZ) were subjected to photoperoxidation (UV/H2O2). The hydroxyl radicals generated by the process removed up to 99% of ABZ, and FBZ, in the highest dosage of H2O2 (i.e., 1.125 mmol L-1; 4.8 kJ L-1). In contrast, 20% of initial TBZ concentration remained in the residual solution. In the first 5 min of reaction (i.e., up to 0.750 mmol L-1 of H2O2), formation of the primary metabolites of ABZ—ricobendazole (RBZ), albendazole sulfone (ABZ-SO2), and oxfendazole (OFZ)—was observed. However, these reaction products were converted after the reaction time was doubled. The residual ecotoxicity was investigated using the Raphidocelis subcapitata microalgae and the marine bacteria Vibrio fischeri. The results for both microorganisms evidence that the residual solutions are less harmful to these microorganisms. However, after 30 min of reaction, the treated solution still presents a toxic effect for V. fischeri, meaning that longer reaction times are required to achieve an innocuous effluent.

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Data availability

All data generated or analyzed during this study are included in this published article and its supplementary information files. The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgments

The authors acknowledge the financial support provided by FAPESP, CAPES, and CNPq. The detailed funding grant number is highlighted in the “Funding” section.

Funding

This study is funded by the Brazilian agencies: The São Paulo Research Foundation – FAPESP, BRAZIL (grants #2013/09543-7, #2018/03571-2, and INCTAA-FAPESP #2014/50951-4). Scholarships were awarded to W.A.L.V and M.S for Coordination for the Improvement of Higher Education Personnel (CAPES) and C.R.-S. National Council for Scientific and Technological Development (CNPq, grant #154061/2018-2).

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Contributions

All authors contributed to the study conception and design. Wilson Augusto Lima Venancio: methodology, validation, formal analysis, investigation, and visualization. Caio Rodrigues-Silva: methodology, supervision, visualization, writing—original draft, writing—review and editing, resources, and formal analysis. Mylena Spina: methodology, validation, and formal analysis. Vinicius Diniz: formal analysis, writing—original draft, writing—review and editing, and visualization. José Roberto Guimarães: supervision, project administration, and funding acquisition. The first draft of the manuscript was written by Caio Rodrigues-Silva and Vinicius Diniz; all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Caio Rodrigues-Silva or José Roberto Guimarães.

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Responsible Editor: Vítor Pais Vilar

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Venancio, W.A.L., Rodrigues-Silva, C., Spina, M. et al. Degradation of benzimidazoles by photoperoxidation: metabolites detection and ecotoxicity assessment using Raphidocelis subcapitata microalgae and Vibrio fischeri. Environ Sci Pollut Res 28, 23742–23752 (2021). https://doi.org/10.1007/s11356-020-11294-x

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  • DOI: https://doi.org/10.1007/s11356-020-11294-x

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