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首页> 外文会议>Siam Physics Congress >L-Cysteine/Graphene oxide for electrochemical determination of ascorbic acid in the presence of dopamine and uric acid
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L-Cysteine/Graphene oxide for electrochemical determination of ascorbic acid in the presence of dopamine and uric acid

机译：L-半胱氨酸/石墨烯氧化物用于多巴胺和尿酸存在下抗坏血酸的电化学测定

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摘要

Ascorbic acid (AA), also known as vitamin C, has many roles in biological systems, such as prevention of cancer and common cold. Determination of AA is essential for food and pharmaceutical industries. Nowadays, electrochemical method is a potential method for detecting AA. However, detection of AA in presence of biological compounds, e.g. dopamine (DA) and uric acid (UA), is big challenge because these compounds are commonly found in biological samples and interfere the oxidation peak potential of AA. To overcome this problem, electrochemical coating of cysteine on graphene oxide decorated screen-printed electrode (Cys/GO/SP) was newly used for determination of AA. Field emission scanning electron microscope, energy dispersive x-ray and EIS were used to characterize the composites. AA of different concentrations were determined in phosphate buffer saline that has 10-μM DA and 10-μM UA using by differential pulse voltammetry (DPV). Cys/GO/SP presented three oxidation peaks corresponding to AA, DA and UA, whereas GO/SP and SP provided single peak. The oxidation peak currents of AA showed good linear relationship with AA concentrations of 0.5 - 5 mM with the detection limit of 0.26 mM. The results suggest that Cys/GO/SP can be used for electrochemical determination of AA in the interference of DA and UA.
机译：抗坏血酸（AA），也称为维生素C，在生物系统中具有许多作用，例如预防癌症和普通感冒。 AA的测定对于食品和制药行业至关重要。如今，电化学方法是检测AA的潜在方法。然而，在生物化合物存在下检测AA，例如，多巴胺（DA）和尿酸（UA）是大挑战，因为这些化合物通常在生物样品中发现并干扰AA的氧化峰值电位。为了克服这个问题，新用于测定AA的石墨烯氧化物上的半胱氨酸电化学涂层。场发射扫描电子显微镜，使用能量分散X射线和EIS来表征复合材料。在使用差分脉冲伏安法（DPV）中，在具有10μMDa和10μmUA的磷酸盐缓冲盐中测定不同浓度的AA。 CYS / GO / SP呈现了与AA，DA和UA对应的三个氧化峰，而GO / SP和SP提供单峰。 AA的氧化峰值电流显示出良好的线性关系，其浓度为0.5-5mm，检测限为0.26mm。结果表明，Cys / Go / Sp可用于DA和UA干扰中AA的电化学测定。

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