Amperometric detection of carbohydrates based on the glassy carbon electrode modified with gold nano-flake layer

Huy Du Nguyen , T. Thuy Luyen Nguyen , Khac Manh Nguyen , Anh Mai Nguyen , Quoc Hien Nguyen
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引用次数: 3

Abstract

An electro-deposition approach was established to incorporate the gold nano-flakes onto the glassy carbon electrode in electrochemical cells (nano-Au/GC/ECCs). Using pulsed amperometric detection (PAD) without any gold oxidation for cleaning (non-oxidative PAD), the nano-Au/GC/ECCs were able to maintain their activity for oxidizing of carbohydrates in a normal alkaline medium. The reproducibility of peak area was about 2 relative standard deviation (RSD,%) for 6 consecutive injections. A dynamic range of carbohydrates was obtained over a concentration range of 5–80 mg L−1 and the limits of detection (LOD) were of 2 mg L−1 for fructose and lactose and 1 mg L−1 for glucose and galactose. Moreover, the nano-Au/GC/ECC using the non-oxidative PAD was able to combine with the internal standard method for determination of lactose in fresh cow milk sample.

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基于金纳米薄片修饰的玻碳电极的碳水化合物安培检测
在电化学电池(纳米au /GC/ECCs)中,建立了将纳米金薄片沉积到玻碳电极上的电沉积方法。采用脉冲安培检测(PAD)清洗,无需任何金氧化(非氧化性PAD),纳米au /GC/ECCs能够在正常碱性介质中保持其氧化碳水化合物的活性。连续注射6次,峰面积重现性约为2相对标准偏差(RSD,%)。在5-80 mg L - 1的浓度范围内,获得了碳水化合物的动态范围,果糖和乳糖的检出限为2 mg L - 1,葡萄糖和半乳糖的检出限为1 mg L - 1。此外,采用非氧化PAD的纳米au /GC/ECC可以与内标法结合用于鲜奶样品中乳糖的测定。
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