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CO2-plasma surface treatment of graphite sheet electrodes for detection of chloramphenicol, ciprofloxacin and sulphanilamide.
Pereira, Jian F S; Di-Oliveira, Marina; Faria, Lucas V; Borges, Pedro H S; Nossol, Edson; Gelamo, Rogério V; Richter, Eduardo M; Lopes, Osmando F; Muñoz, Rodrigo A A.
Afiliação
  • Pereira JFS; Institute of Chemistry, Federal University of Uberlândia (UFU), Uberlândia, MG, 38408-902, Brazil.
  • Di-Oliveira M; Institute of Chemistry, Federal University of Uberlândia (UFU), Uberlândia, MG, 38408-902, Brazil.
  • Faria LV; Institute of Chemistry, Universidade Federal Fluminense (UFF), Niterói, RJ, 24020-141, Brazil.
  • Borges PHS; Institute of Chemistry, Federal University of Uberlândia (UFU), Uberlândia, MG, 38408-902, Brazil.
  • Nossol E; Institute of Chemistry, Federal University of Uberlândia (UFU), Uberlândia, MG, 38408-902, Brazil.
  • Gelamo RV; Institute of Technological and Exact Sciences, Federal University of Triângulo Mineiro (UFTM), Universidade Federal do Triângulo Mineiro, Uberaba, MG, 38064-200, Brazil.
  • Richter EM; Institute of Chemistry, Federal University of Uberlândia (UFU), Uberlândia, MG, 38408-902, Brazil.
  • Lopes OF; Institute of Chemistry, Federal University of Uberlândia (UFU), Uberlândia, MG, 38408-902, Brazil.
  • Muñoz RAA; Institute of Chemistry, Federal University of Uberlândia (UFU), Uberlândia, MG, 38408-902, Brazil. munoz@ufu.br.
Mikrochim Acta ; 190(10): 379, 2023 09 08.
Article em En | MEDLINE | ID: mdl-37682352
Graphite sheet (GS) electrodes are flexible and versatile substrates for sensing electrochemical; however, their use has been limited to incorporate (bio)chemical modifiers. Herein, we demonstrated that a cold (low temperature) CO2 plasma treatment of GS electrodes provides a substantial improvement of the electrochemical activity of these electrodes due to the increased structural defects on the GS surface as revealed by Raman spectroscopy (ID/IG ratio), and scanning electron microscopy images. XPS analyses confirmed the formation of oxygenated functional groups at the GS surface after the plasma treatment that are intrinsically related to the substantial increase in the electron transfer coefficient (K0 values increased from 1.46 × 10-6 to 2.09 × 10-3 cm s-1) and with reduction of the resistance to charge transfer (from 129.8 to 0.251 kΩ). The improved electrochemical activity of CO2-GS electrodes was checked for the detection of emerging contaminant species, such as chloramphenicol (CHL), ciprofloxacin (CIP) and sulphanilamide (SUL) antibiotics, at around + 0.15, + 1.10 and + 0.85 V (versus Ag/AgCl), respectively, by square wave voltammetry. Limit of detection values in the submicromolar range were achieved for CHL (0.08 µmol L-1), CIP (0.01 µmol L-1) and SFL (0.11 µmol L-1), which enabled the sensor to be successfully applied to natural waters and urine samples (recovery values from 85 to 119%). The CO2-GS electrode is highly stable and inexpensive ($0.09 each sensor) and can be easily inserted in portable 3D printed cells for environmental on-site analyses.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Cloranfenicol / Grafite Tipo de estudo: Diagnostic_studies Idioma: En Revista: Mikrochim Acta Ano de publicação: 2023 Tipo de documento: Article País de afiliação: Brasil País de publicação: Áustria
Texto completo
Adicionar na Minha BVS
Imprimir
XML
PubMed Links
Buscar no Google

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Cloranfenicol / Grafite Tipo de estudo: Diagnostic_studies Idioma: En Revista: Mikrochim Acta Ano de publicação: 2023 Tipo de documento: Article País de afiliação: Brasil País de publicação: Áustria