Electroanalysis of nicotine at an electroreduced carboxylated graphene modified glassy carbon electrode
Electroanalysis of nicotine at an electroreduced carboxylated graphene modified glassy carbon electrode
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DOI：
10.1039/c4ay01872a
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发表时间：
2015-01
影响因子：
3.1
通讯作者：
Hualing Xiao;Lingen Sun;Hongling Yan;Wen Wang;Jiali Liu;Qingping Yan;Long Chao;Chao Chen;Q. Xie;Jia-Xin Wen;Donghong Yin
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文献类型：
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作者：
Hualing Xiao;Lingen Sun;Hongling Yan;Wen Wang;Jiali Liu;Qingping Yan;Long Chao;Chao Chen;Q. Xie;Jia-Xin Wen;Donghong Yin
在0.1MKH_2PO_4-Na_2HPO_4缓冲溶液(pH 7.0)中，尼古丁在0.1M KH_2PO_4-Na_2HPO_4缓冲溶液中于−1.1V恒电位富集240 S，制得羧化石墨烯修饰玻碳电极，用于烟碱的循环伏安定量。利用傅立叶变换红外光谱、拉曼光谱、X射线光电子能谱、扫描电子显微镜和电化学技术对其进行了表征。烟碱浓度在2~5μM和5~60μM范围内与烟碱的氧化峰电流呈良好的线性关系，检出限为0.1μM。用ERCG/GCE测定了烟草样品中的尼古丁，回收率在95%以上。
A carboxylated graphene (CG) modified glassy carbon electrode (GCE) was prepared by cast-coating a CG solution on a GCE surface, for quantitative analysis of nicotine based on cyclic voltammetry after potentiostatic enrichment of nicotine at −1.1 V for 240 s in 0.1 M KH2PO4–Na2HPO4 buffer solution (pH 7.0). At this enrichment potential, partially electroreduced CG (ERCG) was obtained, as characterized by Fourier transform infrared spectroscopy, Raman spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy and electrochemistry techniques. The oxidation peak current of nicotine at the ERCG/GCE after a semi-derivative treatment responded linearly to nicotine concentration from 2 to 5 μM and from 5 to 60 μM, with a limit of detection of 0.1 μM. The ERCG/GCE gave analytical performance superior to that at a bare GCE, and the semi-derivative treatment notably improved the signal resolution. The ERCG/GCE was used to determine nicotine in real tobacco samples, with recoveries over 95%.