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首页> 美国卫生研究院文献>Analytical Chemistry Insights >Determination of Xanthine in the Presence of Hypoxanthine by Adsorptive Stripping Voltammetry at the Mercury Film Electrode
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Determination of Xanthine in the Presence of Hypoxanthine by Adsorptive Stripping Voltammetry at the Mercury Film Electrode

机译：汞膜电极吸附溶出伏安法测定次黄嘌呤中黄嘌呤的含量。

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摘要

A stripping method for the determination of xanthine in the presence of hypoxanthine at the submicromolar concentration levels is described. The method is based on controlled adsorptive accumulation at the thin-film mercury electrode followed by a fast linear scan voltammetric measurement of the surface species. Optimum experimental conditions were found to be the use of 1.0 × 10−3 mol L−1 NaOH solution as supporting electrolyte, an accumulation potential of 0.00 V for xanthine and −0.50 V for hypoxanthine–copper, and a linear scan rate of 200 mV second−1. The response of xanthine is linear over the concentration ranges of 20–140 ppb. For an accumulation time of 30 minutes, the detection limit was found to be 36 ppt (2.3 × 10−10 mol L−1). Adequate conditions for measuring the xanthine in the presence of hypoxanthine, copper and other metals, uric acid, and other nitrogenated bases were also investigated. The utility of the method is demonstrated by the presence of xanthine associated with hypoxanthine, uric acid, nitrogenated bases, ATP, and ssDNA.
机译：描述了在次微摩尔浓度水平存在次黄嘌呤时测定黄嘌呤的汽提方法。该方法基于薄膜汞电极上可控的吸附积累，然后进行表面物种的快速线性扫描伏安法测量。发现最佳实验条件是使用1.0×10 −3 mol L -1 NaOH溶液作为支持电解质，黄嘌呤和-0.50的累积电位为0.00V。次黄嘌呤-铜的V，线性扫描速率为200 mV second -1 。黄嘌呤在20–140 ppb的浓度范围内呈线性关系。对于30分钟的累积时间，发现检出限为36 ppt（2.3×10 -10 mol L -1 ）。还研究了在次黄嘌呤，铜和其他金属，尿酸和其他氮化碱存在下测量黄嘌呤的适当条件。通过与次黄嘌呤，尿酸，硝化碱基，ATP和ssDNA结合的黄嘌呤的存在证明了该方法的实用性。

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