Cobalt phthalocyanine as a biomimetic catalyst in the amperometric quantification of dipyrone using FIA.
Talanta
; 85(4): 2067-73, 2011 Sep 30.
Article
em En
| MEDLINE
| ID: mdl-21872059
ABSTRACT
A biomimetic sensor for the determination of dipyrone was prepared by modifying carbon paste with cobalt phthalocyanine (CoPc), and used as an amperometric detector in a flow injection analysis (FIA) system. The results of cyclic voltammetry experiments suggested that CoPc behaved as a biomimetic catalyst in the electrocatalytic oxidation of dipyrone, which involved the transfer of one electron. The optimized FIA procedure employed a flow rate of 1.5 mL min(-1), a 75 µL sample loop, a 0.1 mol L(-1) phosphate buffer carrier solution at pH 7.0 and amperometric detection at a potential of 0.3 V vs. Ag/AgCl. Under these conditions, the proposed method showed a linear response for dipyrone concentrations in the range 5.0 × 10(-6)-6.3 × 10(-3) mol L(-1). Selectivity and interference studies were carried out in order to validate the system for use with pharmaceutical and environmental samples. In addition to being environmentally friendly, the proposed method is a sensitive and selective analytical tool for the determination of dipyrone.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Compostos Organometálicos
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Dipirona
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Análise de Injeção de Fluxo
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Materiais Biomiméticos
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Eletroquímica
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Indóis
Idioma:
En
Revista:
Talanta
Ano de publicação:
2011
Tipo de documento:
Article
País de afiliação:
Brasil