v. 32 n. 2 (2019): Revista ION
Artigos

Detecção eletroquímica de peróxido de hidrogênio usando Peroxidase imobilizada de capim-da-Guiné (Panicum maximum) em eletrodos impressos em tela de pontos quânticos.

Paula Guarín
Universidad Industrial de Santander
Herminsul J. Cano
Universidad Industrial de Santander
John J. Castillo
Universidad Industrial de Santander

Publicado 2020-03-11

Palavras-chave

  • Biossensor,
  • Peroxidase,
  • Capim Guiné,
  • Peróxido de Hidrogênio,
  • Pontos Quânticos.

Como Citar

Guarín, P., Cano, H. J., & Castillo, J. J. (2020). Detecção eletroquímica de peróxido de hidrogênio usando Peroxidase imobilizada de capim-da-Guiné (Panicum maximum) em eletrodos impressos em tela de pontos quânticos. REVISTA ION, 32(2), 67–76. https://doi.org/10.18273/revion.v32n2-2019007

Resumo

Os biossensores eletroquímicos são ferramentas analíticas de resposta rápida e confiável que adquiriram interesse especial nos últimos anos, graças à possibilidade de integrar biomoléculas com eletrodos feitos de materiais nanométricos. Neste trabalho, um biossensor eletroquímico foi desenvolvido para a detecção de peróxido de hidrogênio (H2O2) usando peroxidase do capim-da-Guiné (PPG) imobilizada em eletrodos serigráficos de pontos quânticos (ESPC) serigrafados. O PPG foi isolado e parcialmente purificado a partir de folhas de capim-da-Guiné com atividade específica de 602 U mg-1. Posteriormente, o PPG foi imobilizado na superfície do ESPC por adsorção física e estudo do comportamento eletroquímico foi realizado por voltametria cíclica e cronoamperometria. O PPG revelou um par bem definido de sinais redox em 17mV/-141mV correspondente ao processo redox do grupo heme (Fe2+/Fe3+) de peroxidases. A redução bioeletrocatalítica do H2O2 foi observada com um potencial redox de -645 mV vs. Ag. Esse processo foi controlado pela difusão das espécies na superfície do eletrodo em uma faixa de velocidade de varredura linear de 50-500 mV/s. A cronoamperometria permitiu a construção de curvas de calibração entre a corrente de redução e a concentração de H2O2 para a determinação de parâmetros analíticos como sensibilidade, faixa linear e nível mínimo de detecção. O desenvolvimento deste biossensor amperométrico torna-se uma etapa preliminar para a construção de um dispositivo portátil e de resposta rápida para a análise de H2O2 em amostras de interesse ambiental e biomédico.

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