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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|
|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.|
Multiwalled carbon nanotubes
|Editor:||Wiley-v C H Verlag Gmbh|
|Appears in Collections:||Artigos e Materiais de Revistas Científicas - Unicamp|
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