电极
次黄嘌呤
材料科学
扫描电子显微镜
检出限
黄嘌呤
循环伏安法
透射电子显微镜
分析化学(期刊)
电化学
电化学气体传感器
化学
纳米技术
色谱法
有机化学
复合材料
物理化学
酶
作者
Hossieny Ibrahim,Y. M. Temerk
标识
DOI:10.1016/j.snb.2016.03.133
摘要
A novel electrochemical sensor based on the use of boron doped CeO2 nanocubes modified glassy carbon microspheres paste electrode (B-CeO2NCs/GCPE) was prepared and applied for selective and sensitive determination of xanthine (XA) and hypoxanthine (HXA) individually and simultaneously. The morphology, composition and structural properties of the undoped and B doped CeO2 nanocubes were characterized by X-ray diffraction, energy-dispersed X-ray spectrometry (EDS) and transmission electron microscopy (TEM). Electrochemical activities and the surface analysis of the modified electrode were investigated using scanning electron microscopy (SEM) and cyclic voltammetry (CV). From the B-CeO2NCs/GCPE, well oxidation peaks and enhanced peak currents of XA and HXA were observed owing to the excellent catalytic activity of B-CeO2NCs. For individual detection, the linear responses of XA and HXA were in the concentration range of 5.42 × 10−8–1.31 × 10−5 M and 3.98 × 10−7–6.01 × 10−5 M with detection limits of 3.02 and 6.17 nM, respectively. For simultaneous detection by synchronous change of the concentration of XA and HXA, the linear ranges were 1.98 × 10−7–9.45 × 10−6 M and 3.98 × 10−7–1.28 × 10−5 M with detection limits of 3.65 and 8.17 nM, respectively. The practical application of the modified electrode was demonstrated by simultaneously determining the concentrations of XA and HXA in human biological fluids and in fish meat samples with satisfactory results.
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