Sulfanilamide Electrochemical Sensor Using Phenolic Substrates and CO₂ Laser Pyrolysis

Autor(es)

de Farias, Davi M. ; Pradela-Filho, Lauro A. ; Arantes, Iana V. S. ; Gongoni, Juliana L. M. ; Veloso, William B. ; Meloni, Gabriel N. ; Paixao, Thiago R. L. C.

• Tipo de documento: Artigo Científico
• Fonte: ACS APPLIED MATERIALS & INTERFACES; v. 15, n. 48, p. 9-pg., 2023-11-20.

Resumo

The concentration of environmental pollutants needs to be monitored constantly by reliable analytical methods since they pose a public health risk. Developing simple and affordable sensors for such pollutants can allow for large-scale monitoring economically. Here, we develop a simple electrochemical sensor for sulfanilamide (SFD) quantification using a phenolic resin substrate and a CO2 laser to pyrolyze the sensor geometry over the substrate. The sensors are modified with carbon nanotubes via a simple drop-casting procedure. The carbon nanotube loading effect the electrochemical performance toward a redox probe and analytical performance for SFD detection is investigated, showing no net benefit beyond 1 mg L-1 of carbon nanotubes. The effects of the modification on the SFD oxidation are shown to be more than just an electrode area effect and possibly attributed to the fast electron transfer kinetics of the carbon nanotubes. SFD detection is performed at small solution volumes under static (800 mu L) and hydrodynamic conditions (3 mL) in a fully integrated, miniaturized batch-injection analyses cell. Both methods have a similar linear range from 10.0 to 115.0 mu mol L-1 and high selectivity for SFD determination. Both systems are used to quantify SFD in real samples as a proof of concept, showcasing the proposed device's applicability as a sensor for environmental and public health monitoring of SFD. (AU)

• Processo FAPESP: 19/15065-7 - Desenvolvimento de sistemas eletroquímicos em papel voltados para análises em fluxo de amostras de interesse forense
• Beneficiário: Iana Vitória Spadini Arantes
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto
• Processo FAPESP: 18/08782-1 - Sensores químicos miniaturizados e integrados: novas plataformas de fabricação para aplicações biológicas, clínicas e ambientais
• Beneficiário: Mauro Bertotti
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 21/00205-8 - Dispositivos analíticos miniaturizados e/ou microfluídicos para aplicações biológicas
• Beneficiário: Lauro Antonio Pradela Filho
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado