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Gold nanoparticles in nonenzymatic electrochemical detection of sugars

机译：金纳米颗粒在糖非酶电化学检测中的应用

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摘要

A nonenzymatic electrochemical sensor for detection of sugars was prepared by layer-by-layer deposition of gold nanoparticles on thin gold electrodes. The deposition was optimized by using of surface plasmon resonance. Voltammetric investigation and impedance spectroscopy of the sensor was performed. Electrical currents caused by glucose on bare gold electrodes and on gold electrodes coated by immobilized gold nanoparticles were compared. The electrodes with nanoparticles display much higher current of glucose oxidation. The oxidation becomes blocked when the swept electrode potential exceeded +0.25 V, during the back scan an oxidation peak is observed again but at less positive potential. The magnitudes of these current peaks are linearly dependent on the glucose concentration; this dependence can be used as calibration for analytical applications. The limit of detection for glucose is below 0.5 mM, the sensitivity (normalized to the macroscopic electrode surface) is about 160 mu A cm(-2) mM(-1). The sensor response is linear till at least 8 mM of glucose concentration.
机译：通过在薄的金电极上逐层沉积金纳米颗粒，制备了一种用于检测糖的非酶电化学传感器。通过使用表面等离子体共振优化沉积。进行了伏安法研究和传感器的阻抗谱。比较了由葡萄糖在裸露的金电极上和由固定的金纳米颗粒涂覆的金电极上引起的电流。具有纳米颗粒的电极显示出更高的葡萄糖氧化电流。当扫掠电极电位超过+0.25 V时，氧化被阻止，在反向扫描期间再次观察到氧化峰，但正电位较低。这些电流峰值的大小与葡萄糖浓度成线性关系。这种依赖性可以用作分析应用程序的校准。葡萄糖的检出限低于0.5 mM，灵敏度（相对于宏观电极表面标准化）约为160μA cm（-2）mM（-1）。传感器响应是线性的，直到葡萄糖浓度至少达到8 mM。

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