Use of Screen-printed Electrodes Modified by Prussian Blue and Analogues in Sensing of Cysteine

Autor(es)

Bonacin, Juliano A. ^[1] ; Dos Santos, Pamyla L. ^[1] ; Katic, Vera ^[1] ; Foster, Christopher W. ^[2] ; Banks, Craig E. ^[2]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Inst Chem, POB 6154, BR-13083970 Campinas, SP - Brazil

^[2] Manchester Metropolitan Univ, Fac Sci & Engn, Chester St, Manchester M15 GD, Lancs - England

• Tipo de documento: Artigo Científico
• Fonte: Electroanalysis; v. 30, n. 1, p. 170-179, JAN 2018.
• Citações Web of Science: 10

Resumo

The utilisation of screen-printing technology allows for a mass scalable approach for the production of electrochemical screen-printed electrodes (SPEs) and the presence of a redox mediator can add new possibilities to the electrochemical properties of the SPEs. Among the materials used as redox mediators, cyanidoferrates polymers can be used for electro-oxidation of cysteine. In this work, two monomers, namely, {[}Fe(CN)(6)](4-) and {[}Fe(CN)(5)NH3](3-) were used to produce Prussian blue (PB) and Prussian blue-Ammine (PB-Ammine), respectively. In addition, two modification methods were compared, firstly via a drop-casting and secondly by the incorporation of these materials into a printable ink. The SPE modified by PB-Ammine (drop-casting) exhibits the highest electroactive area, however the highest heterogeneous rate constant was found with the SPE modified by PB-Ammine that was incorporated into the ink. The highest value of the constant of electro-oxidation of cysteine and lowest limit of detection was also observed in the SPE modified by PB incorporated into the ink. These studies suggest that the electrocatalytic properties of SPE modified by PB and PB-Ammine are dependent upon the availability of Fe3+ catalytic sites and the increased kinetics of the chemical reaction between the catalytic sites and the analyte. (AU)

• 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: 17/00461-9 - Desenvolvimento de eletrodos impressos modificados por azul da Prússia e análogos para dispositivos analíticos integrados
• Beneficiário: Juliano Alves Bonacin
• Modalidade de apoio: Bolsas no Exterior - Pesquisa