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A Graphene-Based Electrochemical Sensor for Sensitive Detection of Vanillin

机译：基于石墨烯的电化学传感器用于香兰素的灵敏检测

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摘要

A simple and rapid electrochemical method was developed for the determination of trace-levelvanillin, based on the excellent properties of graphene. The graphene film-coated glassy carbonelectrode (GCE) was constructed and the electrochemical behavior of vanillin at the electrode wasinvestigated in detail. The results indicated that graphene modified GCE exhibited efficientlyelectrocatalytic oxidation for vanillin with relatively high sensitivity and stability. The electrocatalyticbehavior was further exploited as a sensitive detection scheme for the analyte determinations bydifferential pulse voltammetry (DPV). Under the optimized conditions, the oxidation peak current was proportional to vanillin concentration in the range of 6.010 to 4.810 mol L with the correlation coefficient of 0.9996 and the detection limit of 5.610 mol L (S/N = 3). The proposed method wassuccessfully applied to biscuits samples with satisfactory results. The recovery of the method was inthe range of 97.9-103.5%.
机译：基于石墨烯的优异性能，开发了一种简单而快速的电化学方法测定痕量香兰素。构建了石墨烯膜包覆的玻璃碳电极（GCE），并详细研究了香兰素在电极上的电化学行为。结果表明，石墨烯修饰的GCE对香兰素具有高效的电催化氧化作用，具有较高的灵敏度和稳定性。电催化行为被进一步用作通过差分脉冲伏安法（DPV）测定分析物的灵敏检测方案。在最佳条件下，氧化峰电流与香兰素浓度成正比，范围为6.010至4.810 mol L，相关系数为0.9996，检出限为5.610 mol L（S / N = 3）。所提出的方法已成功应用于饼干样品，结果令人满意。该方法的回收率在97.9-103.5％的范围内。

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