Electrochemical Determination of Norepinephrine on Cathodically Pretreated Poly(1,5-diaminonaphthalene) Modified Electrode

Autor(es)

da Silva, Quesia Guedes ^[1] ; Barbosa, Nathalia Vieira ^[1] ; Troiani, Estela de Pieri ^[1] ; Faria, Ronaldo Censi ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, Dept Quim, BR-13565905 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Electroanalysis; v. 23, n. 6, p. 1359-1364, JUN 2011.
• Citações Web of Science: 8

Resumo

A sensitive and simple electrochemical method for norepinephrine (NE) determination was developed based on a poly(1,5-diaminonaphthalene) film electrode (PDAN). Cathodically pretreated PDAN presents good selectivity, sensitivity, and reproducibility for NE. The polymer film can be easily electropolymerized onto a platinum electrode by cyclic voltammetry in 1.0 M HClO(4). A cathodic pretreatment, consisting of the application of a potential of -0.7 V for 3 s (vs. Ag/AgCl) to PDAN before each voltammetric measurement, enhanced the electrochemical activity of NE with no inference of ascorbic acid (AA). In optimized conditions, PDAN presents linear responses for NE in the range of 9.90 to 90.9 mu M by differential pulse voltammetry (DPV) with a detection limit of 1.82 mu M. A relative standard deviation of 3.0% was obtained for 10 consecutive measurements of 40.0 mu M NE solutions. The cathodically pretreated PDAN was successfully applied for NE determination in pharmaceutical formulation samples. (AU)

• Processo FAPESP: 08/06867-8 - Desenvolvimento, caracterização e aplicação analítica de eletrodos nanocompósitos na determinação de catecolaminas e flavonóides
• Beneficiário: Ronaldo Censi Faria
• Modalidade de apoio: Auxílio à Pesquisa - Regular