Abstract

Herein, we introduce a novel modification process for carbon paste electrode by magnetic core–shell nanocomposite of graphene oxide/Fe₃O₄@SiO₂ and n-hexyl-3-methylimidazolium hexafluoro phosphate as ionic liquid. Electrochemical features of this modified carbon paste electrode and its performance evaluation in simultaneous detection of acetaminophen and tyrosine via voltammetric oxidation was investigated. Moreover, diagnostic techniques including cyclic voltammetry, square wave voltammetry and chronoamperometry were applied in order to study the electrochemical oxidation behavior of this sensor toward acetaminophen. According to square wave voltammetry results, linear dynamic range between 1.0 × 10^–6–1.0 × 10^–3 M was observed for acetaminophen. The function of modified electrode in real samples containing acetaminophen and tyrosine was satisfactory.

中文翻译：

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氧化石墨烯/ Fe 3 O 4 @SiO 2 /离子液体纳米复合材料修饰的碳糊电极在酪氨酸存在下伏安法测定对乙酰氨基酚

摘要

在此，我们介绍了一种通过氧化石墨烯/ Fe ₃ O ₄ @SiO ₂和正己基-3-甲基咪唑六氟磷酸盐为离子液体的磁性核-壳纳米复合材料对碳糊电极进行改性的新工艺。研究了该修饰碳糊电极的电化学特性及其通过伏安氧化法同时检测对乙酰氨基酚和酪氨酸的性能。此外，为了研究该传感器对乙酰氨基酚的电化学氧化行为，应用了循环伏安法，方波伏安法和计时电流法等诊断技术。根据方波伏安法的结果，线性动态范围在1.0×10 ^–6之间-1.0×10 ^-3，观察到对乙酰氨基酚微米。修饰电极在含对乙酰氨基酚和酪氨酸的实际样品中的功能令人满意。