Electrochemical Determination of Oncocalyxone A using an Iron-phthalocyanine/Iron-porphyrin Modified Glassy Carbon Electrode

نویسندگان

  • Cicero de O. Costa
  • Antonio A. de Souza
  • Rita de Cássia S. Luz
  • Telma L. G. Lemos
  • Otília D. L. Pessoa
  • Lauro T. Kubota
  • Marília O. F. Goulart
چکیده

Descreve-se, no presente trabalho, o desenvolvimento de um sensor voltamétrico altamente sensível para a oncocalixona A, utilizando-se eletrodo de carbono vítreo modificado com uma bicamada de ftalocianina tetrassulfonada de ferro(II) (FeTSPc) e tetra-(N-metil-4-piridil)-porfirina de ferro(III) (FeT 4 MPyP). O eletrodo modificado apresentou alta atividade catalítica e estabilidade em relação à redução da oncocalixona, proporcionando deslocamento anódico de ca. de 30 mV e amplificação da corrente de pico, em relação a iguais parâmetros obtidos em eletrodo de carbono vítreo não modificado. Um ampla faixa linear de resposta entre 0.005-1.2 μmol L, com sensibilidade de 8.11 μA L μmol e limites de detecção (LOD) e quantificação (LOQ) de 1.5 e 5 nmol L foram obtidos, com o uso desse sensor.

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تاریخ انتشار 2008