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首页> 外文期刊>International Journal of Electrochemical Science >Comparative Voltammetric Analysis of Adenine and Xanthine on a Pencil Graphite Electrode in the Presence of Copper Ions
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Comparative Voltammetric Analysis of Adenine and Xanthine on a Pencil Graphite Electrode in the Presence of Copper Ions

机译：铜离子存在下铅笔石墨电极上腺嘌呤和黄嘌呤的比​​较伏安分析

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摘要

This work compares voltammetric responses of adenine (Ade) and xanthine (Xan) on a pencil graphiteelectrode (PeGE) in the presence of copper ions. For electroanalytical monitoring linear sweepvoltammetry (LSV) in connection with elimination procedure (EVLS elimination voltammetry withlinear scan), differential pulse voltammetry (DPV), and constant current potentiostatic strippinganalysis (CPSA) were used. Both substances are oxidized on PeGE providing simple oxidation peaksin the absence of Cu(II) at about 0.8 V (Xan) and 1.1 V (Ade). Electrochemically produced Cu(I) ionsgive rise to new oxidation peaks corresponding to the oxidation of a sparingly soluble Cu(I)-purinecomplex at less positive potentials (~0.45 V) while the former oxidation purine peaks are increased.Compared to Ade the oxidative signal of Xan is split into two peaks depending on scan rate. Peak- counterpeak EVLS signals reflect the charge transfer processes proceeding in an adsorbed state, andthis fact confirms the suggested mechanism of both electrode processes. The splitting of xanthineoxidation signal was tested by means of a potential jump from -0.15 V to 0.65 V. The effect of scanrate, pH and concentration of Cu and ligands was studied in order to evaluate not only the nature of theadditional Xan oxidation peak but also to optimize the best conditions for electroanalyticaldetermination of Ade and Xan in mixtures.
机译：这项工作比较了铜离子存在下铅笔石墨电极（PeGE）上腺嘌呤（Ade）和黄嘌呤（Xan）的伏安响应。对于与消除程序（带有线性扫描的EVLS消除伏安法）相关的电分析监测线性扫描伏安法（LSV），使用差分脉冲伏安法（DPV）和恒流恒电位溶出分析（CPSA）。两种物质均在PeGE上氧化，在不存在Cu（II）的情况下，在约0.8 V（Xan）和1.1 V（Ade）的条件下提供简单的氧化峰。电化学产生的Cu（I）离子会在较小的正电势（〜0.45 V）下产生一个新的氧化峰，该峰对应于难溶的Cu（I）-嘌呤配合物的氧化，而以前的氧化嘌呤峰则增加。与Ade的氧化信号相比Xan的峰根据扫描速率分为两个峰。峰峰值EVLS信号反映了在吸附状态下进行的电荷转移过程，这一事实证实了两种电极过程的建议机理。通过从-0.15 V到0.65 V的电位跃变测试黄嘌呤氧化信号的分裂。研究了扫描速率，pH和Cu和配体浓度的影响，不仅评估了额外Xan氧化峰的性质，而且还评估了以优化混合物中Ade和Xan电分析测定的最佳条件。

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