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首页> 外文期刊>Electroanalysis >Graphite Oxide and Gold Nanoparticles as Alternative Materials in the Design of a Highly Sensitive Electrochemical Sensor for the Simultaneous Determination of Biological Species
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Graphite Oxide and Gold Nanoparticles as Alternative Materials in the Design of a Highly Sensitive Electrochemical Sensor for the Simultaneous Determination of Biological Species

机译：石墨氧化物和金纳米颗粒作为替代材料的设计，用于同时测定生物物种的高敏感电化学传感器

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摘要

New aspects related to electrochemical performance of modified carbon paste electrodes (CPE) of high analytical performance are presented in this work. We studied whether the functionalisation of graphite powder with oxygenated functional groups (graphite oxide, GrO) could affect the electrochemical features of a classical CPE. By introducing oxygen termination over the graphite surface, a remarkable improvement in electrochemical performance was verified, including enhancement of analytical signals and charge transfer kinetics, as demonstrated from electrochemical characterisation assays conducted by cyclic voltammetry and electrochemical impedance spectroscopy towards the potassium hexa-cyanoferrate (II/III) probe. In addition, a positive effect was noted from the anchoring of Au nanoparticles on GrOPE. In analytical terms, two biologically relevant molecules were simultaneously determined using the proposed modified electrode based on GrO and AuNPs: epinephrine (EP) and uric acid (UA). Using differential pulse voltammetry (DPV), wide linear concentration ranges were founded for the analytical curves of EP and UA, and the limits of detection of 1.0x10(-7) molL(-1) (EP) and 5.0x10(-8) molL(-1) (UA) were predicted, respectively. The designed electrochemical sensor showed excellent precision of measurement and appropriate applicability for the analysis of biological fluids.
机译：在这项工作中提出了与高分析性能的改性碳浆料电极（CPE）的电化学性能相关的新方面。我们研究了具有含氧官能团（石墨氧化物，GAG）的石墨粉末的功能化是否可以影响经典CPE的电化学特征。通过在石墨表面上引入氧气终止，验证了电化学性能的显着改善，包括增强分析信号和电荷转移动力学，如通过通过循环伏安法和电化学阻抗光谱对霍沙达钾 - 氰基甲酸钾进行的电化学表征测定（II / iii）探针。此外，从Au纳米颗粒的锚固术中注意到了阳性效果。在分析术语中，使用基于GA和AUNP的所提出的修饰电极同时测定两个生物学相关分子：肾上腺素（EP）和尿酸（UA）。使用差分脉冲伏安法（DPV），为EP和UA的分析曲线建立了宽的线性浓度范围，以及1.0×10（-7）莫尔（-1）（EP）和5.0x10（-8）的检测限。预计莫尔（-1）（UA）分别预测。设计的电化学传感器展示了优异的测量精度和适当适用性，用于分析生物流体。

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