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Cordeiro SG, Ziem R, Schweizer YA, Costa B, Kuhn D, Haas P, Weber AC, Heidrich D, Ethur EM, Steffens C, Hoehne L. Degradation of micropollutant cephalexin by ultraviolet (UV) and assessment of residual antimicrobial activity of transformation products. Water Sci Technol 2021; 84:374-383. [PMID: 34312344 DOI: 10.2166/wst.2021.170] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Cephalexin (CEX) is an antibiotic commonly used to treat bacterial infections in humans and animals. However, it is also a micropollutant. Thus, this study evaluated the degradation of CEX using ultraviolet irradiation (UV-C) and analyzed the by-products as well as their residual antimicrobial activity. A reactor with a mercury vapor lamp was used for the degradation. Irradiated CEX solutions were collected over a period of 4 hours and analyzed using high-performance liquid chromatography coupled with mass spectrometry. For the residual antimicrobial activity the susceptibility test was performed using Staphylococcus aureus and Escherichia coli microorganisms by broth microdilution. It was found that CEX, after treatment, generated a metabolite with a mass of 150 m/z in 15 min. A four- and eightfold increase in the minimum inhibitory concentration of the drug against S. aureus and E. coli could be observed, respectively, after 20 min. Therefore, this treatment proved to be effective in the degradation of CEX, being able to degrade 81% of the initial molecule of the drug in 20 min. Furthermore, the antimicrobial activity of the CEX solution decreased as the irradiation time increased, indicating loss of antimicrobial function of the initial CEX molecule and the resulting by-products.
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Affiliation(s)
- Sabrina Grando Cordeiro
- Programa de Pós-Graduação em Biotecnologia - Univates, Avenida Avelino Talini, 171, Lajeado, Rio Grande do Sul, ZIP CODE: 95914-014, Brazil
| | - Rafaela Ziem
- Programa de Pós-Graduação em Biotecnologia - Univates, Avenida Avelino Talini, 171, Lajeado, Rio Grande do Sul, ZIP CODE: 95914-014, Brazil
| | - Ytan Andreine Schweizer
- Programa de Pós-Graduação em Biotecnologia - Univates, Avenida Avelino Talini, 171, Lajeado, Rio Grande do Sul, ZIP CODE: 95914-014, Brazil
| | - Bruna Costa
- Programa de Pós-Graduação em Biotecnologia - Univates, Avenida Avelino Talini, 171, Lajeado, Rio Grande do Sul, ZIP CODE: 95914-014, Brazil
| | - Daniel Kuhn
- Programa de Pós-Graduação em Biotecnologia - Univates, Avenida Avelino Talini, 171, Lajeado, Rio Grande do Sul, ZIP CODE: 95914-014, Brazil
| | - Peterson Haas
- Programa de Pós-Graduação em Biotecnologia - Univates, Avenida Avelino Talini, 171, Lajeado, Rio Grande do Sul, ZIP CODE: 95914-014, Brazil
| | - Ani Caroline Weber
- Programa de Pós-Graduação em Biotecnologia - Univates, Avenida Avelino Talini, 171, Lajeado, Rio Grande do Sul, ZIP CODE: 95914-014, Brazil
| | - Daiane Heidrich
- Programa de Pós-Graduação em Biotecnologia - Univates, Avenida Avelino Talini, 171, Lajeado, Rio Grande do Sul, ZIP CODE: 95914-014, Brazil
| | - Eduardo Miranda Ethur
- Programa de Pós-Graduação em Biotecnologia - Univates, Avenida Avelino Talini, 171, Lajeado, Rio Grande do Sul, ZIP CODE: 95914-014, Brazil
| | - Clarice Steffens
- Universidade Regional Integrada do Alto Uruguai e das Missões, Campus Erechim. Avenida Sete de Setembro, 1621 - Fátima, Erechim, Rio Grande do Sul, ZIP CODE: 99709-910, Brazil
| | - Lucélia Hoehne
- Programa de Pós-Graduação em Biotecnologia - Univates, Avenida Avelino Talini, 171, Lajeado, Rio Grande do Sul, ZIP CODE: 95914-014, Brazil
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Kuhn D, Ziem R, Scheibel T, Buhl B, Vettorello G, Pacheco LA, Heidrich D, Kauffmann C, de Freitas EM, Ethur EM, Hoehne L. Antibiofilm activity of the essential oil of Campomanesia aurea O. Berg against microorganisms causing food borne diseases. Lebensm Wiss Technol 2019. [DOI: 10.1016/j.lwt.2019.03.079] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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