Cathodically pretreated poly(1-aminoanthraquinone)-modified electrode for determination of ascorbic acid, dopamine, and uric acid

Autor(es)

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: Journal of Applied Electrochemistry; v. 43, n. 9, p. 919-926, SEP 2013.
• Citações Web of Science: 12

Resumo

This paper describes a rapid and reliable method for dopamine (DA), ascorbic acid (AA), and uric acid (UA) determination in human urine using a cathodically pretreated poly(1-aminoanthraquinone) (PAAQ)-modified electrode. By applying a simple cathodic pretreatment to the PAAQ electrode well-defined voltammetric peaks for AA, DA, and UA were obtained. The pretreated PAAQ showed good selectivity, sensitivity, and repeatability for measuring AA, DA, and UA with detection limits of 2.50 x 10(-5), 3.05 x 10(-6), and 1.15 x 10(-5) M, respectively. The practical applicability of the modified electrode is illustrated by selective measurements of AA and UA in human urine without any preliminary treatment. Recovery values between 94.8 and 102 % for AA and between 77.8 and 100 % for UA were obtained with a relative standard deviation of 2.74 and 2.98 %, respectively. (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