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Electrochemically Inspired Copper(II) Complex on Disposable Graphite Pencil Electrode for Effective Simultaneous Detection of Hypoxanthine, Xanthine, and Uric Acid
Electroanalysis ( IF 2.7 ) Pub Date : 2018-07-11 , DOI: 10.1002/elan.201800397
Nurudeen A. Odewunmi 1 , Abdel-Nasser Kawde 1 , Mohamed Ibrahim 2
Affiliation  

A facile electrochemical method was developed by in‐situ electrochemical complexation of Cu(II) ions with uric acid (UA), xanthine (XA) and hypoxanthine (HXA) on the disposable graphite pencil electrode (DGPE) surface for sensitive and selective simultaneous determination of UA, XA and HXA in phosphate buffer solution (PBS, pH 7.00±0.20). Raman Spectroscopy revealed the fluorescence nature of the corresponding Cu(II) – complexes of phosphate ions, UA, XA and HXA on DGPE while Density Function Theory (DFT) calculation was used to estimate their binding energies which are responsible for the enhanced peaks of UA, XA, and HXA as a result of their stronger interaction with copper atoms than phosphate ions. Square wave voltammetry was used in the analytical part. The calculated limits of detections were 14.42 nM, 5.04 nM and 4.93 nM for UA, XA and HXA, respectively. Potential interferences showed almost no significant effect on the peaks of UA, XA, and HXA, and the developed method was successfully utilized for simultaneous determination of the three analytes on human serum and urine with impressive percentage recovery.

中文翻译:

一次性石墨笔电极上的电化学激发铜(II)配合物可有效同时检测次黄嘌呤,黄嘌呤和尿酸

通过在一次性石墨笔电极(DGPE)表面上铜(II)离子与尿酸(UA),黄嘌呤(XA)和次黄嘌呤(HXA)的原位电化学络合开发了一种简便的电化学方法,用于灵敏和选择性同时测定磷酸盐缓冲溶液(PBS,pH 7.00±0.20)中的UA,XA和HXA含量。拉曼光谱法揭示了DGPE上相应的磷酸铜离子,UA,XA和HXA的Cu(II)-配合物的荧光性质,同时使用密度函数理论(DFT)计算来估计它们的结合能,这是导致UA峰增加的原因,XA和HXA与铜原子的相互作用要比磷酸根离子强。分析部分使用方波伏安法。对于UA,XA和HXA,计算出的检出限分别为14.42 nM,5.04 nM和4.93 nM,分别。潜在的干扰对UA,XA和HXA的峰几乎没有显着影响,并且该开发的方法成功地用于同时测定人血清和尿液中的三种分析物,回收率令人印象深刻。
更新日期:2018-07-11
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