A copper-based metal-organic framework/reduced graphene oxide-modified electrode for electrochemical detection of paraquat

Autor(es)

Wachholz Junior, Dagwin ; Deroco, Patricia Batista ; Kubota, Lauro Tatsuo

• Tipo de documento: Artigo Científico
• Fonte: Microchimica Acta; v. 189, n. 8, p. 12-pg., 2022-08-01.

Resumo

An electrochemical device using copper-based metalorganic franmeworks (MOF) associated with reduced graphene oxide to improve the charge transfer, stability, and adherence of the structures on the surface of the electrodes was developed. The syntheses of these materials were confirmed using scanning electron microscopy, thermogravimetric analysis, X-ray diffraction, Fourier transform infrared and Raman spectroscopy. For the first time, this type of sensor was applied to a systematic study to understand the action mechanism of MOFs and reduced graphene oxide in the electrochemical detection of paraquat pesticide. Under optimized conditions, paraquat was detected in standard solutions by differential pulse voltammetry (- 0.8 to - 0.3 V vs Ag/AgCl), achieving a linear response range between 0.30 and 5.00 mu mol L-1. The limits of detection and quantification were 50.0 nmol L-1 and 150.0 nmol L-1, respectively. We assessed the accuracy of the proposed device to determine paraquat in water and human blood serum samples by recovery study, obtaining recovery values ranging from 98 to 104%. Furthermore, the selectivity of the proposed electrode for paraquat detection was evaluated against various interferences, demonstrating their promising application in environmental analysis. (AU)

• Processo FAPESP: 21/09706-0 - Desenvolvimento de biossensor eletroquímico baseado na tecnologia CRISPR/Cas para detecção do vírus causador da Leucemia de Células T (HTLV-1) e da bactéria Staphylococcus aureus a partir de dispositivos point-of-care
• Beneficiário: Dagwin Wachholz Júnior
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 19/00166-2 - Biossensor eletroquímico a base de papel para detecção do Traumatismo Cranioencefálico
• Beneficiário: Patrícia Batista Deroco
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 13/22127-2 - Desenvolvimento de novos materiais estratégicos para dispositivos analíticos integrados
• Beneficiário: Lauro Tatsuo Kubota
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 14/50867-3 - INCT 2014: Instituto Nacional de Ciência e Tecnologia de Bioanalítica
• Beneficiário: Marco Aurelio Zezzi Arruda
• Modalidade de apoio: Auxílio à Pesquisa - Temático