Voltammetric Determination of Dipyrone Using a N,N’-ethylenebis(salicylideneaminato)oxovanadium(IV) Modified Carbon-Paste Electrode

نویسندگان

  • Marcos F. S. Teixeira
  • Luiz H. Marcolino-Júnior
  • Orlando Fatibello-Filho
  • Edward R. Dockal
  • Éder T. G. Cavalheiro
چکیده

A preparação e a caracterização eletroquímica de um eletrodo de pasta de carbono modificado com o complexo N,N ́-etilenobis(salicilidenoaminato) de oxovanádio(IV) ([VO(Salen)]), como também o seu comportamento eletrocatalítico na oxidação da dipirona foi investigado. O comportamento eletroquímico do eletrodo modificado e a eletrooxidação da dipirona foram estudados usando a voltametria cíclica. A resposta voltamétrica do eletrodo modificado é baseada em duas reações. Uma relacionada com a oxidação eletroquímica do centro metálico do complexo [VO(Salen)] e a outra que envolve o processo redox entre centro metálico do complexo oxidado e a dipirona. A melhor resposta voltamétrica foi observada para uma composição do eletrodo de 25% (m/m) [VO(Salen)] em solução eletrolítica de KCl para pH entre 5,5 a 8,0 e uma velocidade de varredura de 10 mV s na presença de dipirona. Uma resposta voltamétrica linear para dipirona foi obtida no intervalo de concentração de 9,9 x 10 a 2,8 x 10 mol L, com um limite de detecção de 7,2 x 10 mol L. Entre os diversos compostos testados como interferente, somente o ácido ascórbico apresentou alguma interferência. O eletrodo proposto é útil para o controle de qualidade e a análise rotineira de dipirona em formulações farmacêuticas.

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تاریخ انتشار 2004