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Type: Artigo de periódico
Title: Highly Sensitive and Selective Basal Plane Pyrolytic Graphite Electrode Modified with 1,4-Naphthoquinone/MWCNT for Simultaneous Determination of Dopamine, Ascorbate and Urate
Author: Oliveira, AX
Silva, SM
Leite, FRF
Kubota, LT
Damos, FS
Luz, RDS
Abstract: The present work describes the development of a highly selective and sensitive voltammetric sensor for dopamine (DA), ascorbic acid (AA) and uric acid (UA) using a basal plane pyrolytic graphite (BPPG) electrode modified with 1,4-naphthoquinone (NQ) adsorbed on multiwalled carbon nanotubes (MWCNT). The modified electrode showed an excellent electrochemical activity towards the oxidations of DA, AA and UA. Three well-defined voltammetric peaks, in a buffered solution at pH7.5, were obtained by differential pulse voltammetry (DPV) at 0.050, 0.145 and 0.270Vvs. Ag/AgCl for AA, DA and UA, respectively. Linear calibration plots were obtained in the range of 1070nmolL1 for DA, 40280 mu molL1 for AA and 214 mu molL1 for UA, with detection limits of 3nmolL1, 1.9 mu molL1 and 0.1 mu molL1, respectively. The sensor was successfully applied in human urine samples and the results showed that the modified electrode has no interferences from urine sample.
Subject: 1
Multiwalled carbon nanotubes
Ascorbic acid
Uric acid
Country: Alemanha
Editor: Wiley-v C H Verlag Gmbh
Citation: Electroanalysis. Wiley-v C H Verlag Gmbh, v. 25, n. 3, n. 723, n. 731, 2013.
Rights: fechado
Identifier DOI: 10.1002/elan.201200515
Date Issue: 2013
Appears in Collections:Unicamp - Artigos e Outros Documentos

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