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Type: Artigo de periódico
Title: Poly-xanthurenic acid modified electrodes: An amperometric sensor for the simultaneous determination of ascorbic and uric acids
Author: Silva, FDD
Lopes, CB
Kubota, LT
Lima, PR
Goulart, MOF
Abstract: The poly-xanthurenic acid (poly-Xa)/multi-walled carbon nanotube (MWCNT)/glassy carbon modified electrode (poly-Xa/MWCNT/GCE) was successfully applied for the simultaneous determination of ascorbic (AA) and uric (UA) acids. Cyclic voltammetric results show that the modified electrode displays an excellent eletrocatalytic activity toward the oxidation of AA at a low potential (0.05 V versus Ag/AgCl) and anodic peak resolution (Delta E-pa), close to 300 mV versus Ag/AgCl, in solutions containing AA and UA. Values in the order of 10(6) L mol(-1) s(-1) were obtained for the kinetic constant k(cat) for the catalytic oxidation of AA, upon evaluation by cyclic voltammetry, chronoamperometry and RDE. Furthermore, the sensor provided limits of detection of 0.19 mu mol L-1 and 0.31 mu mol L-1 for AA and UA, respectively. The sensor was applied for the simultaneous determination of AA and UA in urine samples and the average recoveries for these samples were 99.9 (+/-2.5)% and 99.9 (+/-2.6)%, respectively. (C) 2012 Elsevier B.V. All rights reserved.
Subject: Xanthurenic acid
Ascorbic acid
Uric acid
Chemically modified electrodes
Country: Suíça
Editor: Elsevier Science Sa
Citation: Sensors And Actuators B-chemical. Elsevier Science Sa, v. 168, n. 289, n. 296, 2012.
Rights: fechado
Identifier DOI: 10.1016/j.snb.2012.04.025
Date Issue: 2012
Appears in Collections:Unicamp - Artigos e Outros Documentos

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