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首页> 外文期刊>Sensors and Actuators >Poly-xanthurenic acid modified electrodes: An amperometric sensor for the simultaneous determination of ascorbic and uric acids
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Poly-xanthurenic acid modified electrodes: An amperometric sensor for the simultaneous determination of ascorbic and uric acids

机译：聚黄嘌呤酸修饰电极：用于同时测定抗坏血酸和尿酸的安培传感器

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摘要

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 (ΔE_(pa)), close to 300 mV versus Ag/AgCl, in solutions containing AA and UA. Values in the order of 10~6 Lmol~(-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 μmol L~(-1) and 0.31 μmol 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.
机译：聚黄嘌呤酸（poly-Xa）/多壁碳纳米管（MWCNT）/玻碳修饰电极（poly-Xa / MWCNT / GCE）成功用于同时测定抗坏血酸（AA）和尿酸（UA）酸。循环伏安法结果表明，修饰电极在低电位（相对于Ag / AgCl为0.05 V）和阳极峰分离度（ΔE_（pa））（相对于Ag / AgCl接近300 mV）时，对AA的氧化表现出优异的电催化活性，在含有AA和UA的溶液中。通过循环伏安法，计时安培法和RDE法评估，得到的AA催化氧化动力学常数k_（cat）约为10〜6 Lmol〜（-1）s〜（-1）。此外，该传感器对AA和UA的检测限分别为0.19μmolL〜（-1）和0.31μmolL〜（-1）。该传感器用于同时测定尿液样品中的AA和UA，这些样品的平均回收率分别为99.9（±2.5）％和99.9（±2.6）％。

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  • 来源
    《Sensors and Actuators》 |2012年第2012期|p.289-296|共8页
  • 作者

    Francisco de Assis dos Santos Silva; Cleylton Bezerra Lopes; Lauro Tatsuo Kubota; Phabyanno Rodrigues Lima; Marilia Oliveira Fonseca Goulart;

  • 作者单位

    Institute de Quimica e Biotecnologia, Universidade Federal de Alagoas, 57072-970 Maceio, AL, Brazil,Instituto National de Gencia e Tecnologia de Bioanalitica, UNICAMP, C. Postal 6154, 13084-971 Campinas, SP, Brazil;

    Institute de Quimica e Biotecnologia, Universidade Federal de Alagoas, 57072-970 Maceio, AL, Brazil,Instituto Federal de Educacao. Ciencia e Tecnologia de Alagoas, IFAL, 57020-600 Maceid, AL, Brazil,Instituto National de Gencia e Tecnologia de Bioanalitica, UNICAMP, C. Postal 6154, 13084-971 Campinas, SP, Brazil;

    Instituto de Quimica, UNICAMP, C. Postal 6154, 13084-971 Campinas. SP, Brazil,Instituto National de Gencia e Tecnologia de Bioanalitica, UNICAMP, C. Postal 6154, 13084-971 Campinas, SP, Brazil;

    Institute de Quimica e Biotecnologia, Universidade Federal de Alagoas, 57072-970 Maceio, AL, Brazil,Instituto Federal de Educacao. Ciencia e Tecnologia de Alagoas, IFAL, 57020-600 Maceid, AL, Brazil,Instituto National de Gencia e Tecnologia de Bioanalitica, UNICAMP, C. Postal 6154, 13084-971 Campinas, SP, Brazil;

    Institute de Quimica e Biotecnologia, Universidade Federal de Alagoas, 57072-970 Maceio, AL, Brazil,Instituto National de Gencia e Tecnologia de Bioanalitica, UNICAMP, C. Postal 6154, 13084-971 Campinas, SP, Brazil;

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  • 正文语种 eng
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  • 关键词

    xanthurenic acid; MWCNT; ascorbic acid; uric acid; electrocatalysis; chemically modified electrodes;

    机译：黄嘌呤酸;MWCNT;抗坏血酸;尿酸;电催化化学修饰电极;

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