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首页> 外文期刊>American Journal of Analytical Chemistry >Adsorptive Stripping Voltammetric Determination of Mangiferin Using an Activated Chitosan Modified Carbon Paste Electrode
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Adsorptive Stripping Voltammetric Determination of Mangiferin Using an Activated Chitosan Modified Carbon Paste Electrode

机译：壳聚糖修饰碳糊电极吸附伏安法测定芒果苷。

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A medium molecular weight powdered chitosan modified carbon paste electrode was used to investigate the electrochemical behaviour by cyclic voltammetry of the pharmacologically-active ingredient mangiferin (MG). An irreversible system was observed, with a peak at ﹢0.55 V (vs Ag/AgCl). The peak current increases about fourfold, at the modified electrode in comparison with that recorded at the chitosan free carbon paste electrode. This allowed the use of adsorptive stripping voltammetry to develop a simple and sensitive electroanalytical method for the determination of MG. The influence of key parameters was investigated, including the electrolysis potential, the preconcentration time, the pH of supporting electrolyte and MG concentration. Upon optimisation of these parameters, the electrode response was found to be directly proportional to the concentration of MG in the range from 2.06 × 10﹣6 M to 6.74 × 10﹣5 M, leading to a detection limit of 1.84 μM for 240 s preconcentration at ﹣0.1 V. A mechanism was also proposed for the electrochemical oxidation of MG.
机译：使用中等分子量的壳聚糖修饰碳糊状粉末电极，通过循环伏安法研究药理活性成分芒果苷（MG）的电化学行为。观察到一个不可逆的系统，其峰值在﹢0.55 V（vs Ag / AgCl）处。与在壳聚糖游离碳糊电极上记录的峰值电流相比，在修饰电极上的峰值电流增加了约四倍。这允许使用吸附溶出伏安法开发测定MG的简单而灵敏的电分析方法。研究了关键参数的影响，包括电解电位，预浓缩时间，支持电解质的pH和MG浓度。在优化这些参数后，发现电极响应与MG浓度成正比，范围为2.06×10﹣6 M至6.74×10﹣5 M，导致240 s预浓缩的检测限为1.84μM在﹣0.1 V下。还提出了MG电化学氧化的机理。

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