Manganese phthalocyanine as a biomimetic electrocatalyst for phenols in the development of an amperometric sensor

Journal of the Brazilian Chemical Society

Sousa, Aline L.¹  Damos, Flavio S.¹  Kubota, Lauro T.¹  Santos, Wilney de Jesus R.¹  Universidade Federal do Maranhão, São Luís, Brazil¹  Tanaka, Sônia Maria C. N.¹  Universidade Estadual de Campinas, Campinas, Brazil¹  Sotomayor, Maria del Pilar T.¹  Universidade Federal dos Vales do Jequitinhonha e Mucuri, Diamantina, Brazil¹  Instituto Nacional de Ciência e Tecnologia de Bioanalítica, Campinas, Brazil¹  Universidade Estadual Paulista, Araraquara, Brazil¹  Tanaka, Auro A.¹ 

关键词: manganese phthalocyanine;    phenolic compound;    amperometric sensor;   

DOI  :  10.1590/S0103-50532009000600025

学科分类：化学（综合）

来源: SciELO

【 摘 要 】

The construction of an amperometric sensor for phenolic compounds using a carbon paste electrode modified with manganese phthalocyanine and histidine is reported. Under optimized conditions, at 0 mV vs Ag/AgCl in 0.1 mol dm-3 phosphate buffer solutions (pH 7.0) containing 250 µmol dm-3 H2O2, a linear response for catechol from 20 up to 130 µmol dm-3 was obtained with a sensitivity of 0.56 (± 0.02) µA dm3 µmol-1 cm-2. The detection limit was 1.1 µmol dm-3 and the response time was 2 s. The sensor presented stable response during 40 successive determinations. The repeatability, evaluated in terms of relative standard deviation, was 3.6% for n = 5 and [catechol] = 10 µmol dm-3. The sensor responses for other phenolic compounds were also investigated in details. Finally, the applicability of the sensor was tested in a pharmaceutical containing dopamine and the results compared favorably with those obtained with the official method.

【 授权许可】

Unknown