期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 168, 期 -, 页码 289-296出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2012.04.025
关键词
Xanthurenic acid; MWCNT; Ascorbic acid; Uric acid; Electrocatalysis; Chemically modified electrodes
资金
- FAPEAL
- FAPEAL/PRONEX
- CAPES/PNPD
- CNPq
- PROCAD/NF
- INCT-Bionalitica
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.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据