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首页> 外文期刊>Electroanalysis >Chitosan incorporating cetyltrimethylammonium bromide modified glassy carbon electrode for simultaneous determination of ascorbic acid and dopamine
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Chitosan incorporating cetyltrimethylammonium bromide modified glassy carbon electrode for simultaneous determination of ascorbic acid and dopamine

机译：壳聚糖结合十六烷基三甲基溴化铵修饰的玻碳电极同时测定抗坏血酸和多巴胺

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摘要

Simultaneous determination of a neurotransmitter, dopamine (DA), and ascorbic acid (AA) is achieved at neutral pH on a chitosan incorporating cetyltrimethylammonium bromide CTAB) modified glassy carbon (GC) electrode. Differential pulse voltammetry (DPV) technique was used to investigate the electrochemical response of DA and AA at a glassy carbon electrode modified with chitosan incorporating CTAB. An optimum 6.0 mmol L-1 of CTAB together with 0.5 wt% of chitosan was used to improve the resolution and the determination sensitivity. In 0. 1 mol L-1 aqueous phosphate buffer solution of pH 6.8, the chitosan-CTAB modified electrode showed a good electrocatalytic response towards DA and AA. The anodic peak potential of DA shifted positively, while that of AA shifted negatively. Thus, the difference of the anodic peaks of DA and AA reached 0.23 V, which was enough to separate the two anodic peaks very well. The presented method herein could be applied to the direct simultaneous determination of DA and AA without prior treatment. The anodic peak currents (I-pa) of DPV are proportional to DA in the concentration range of 8 mu M to 1000 mu M, to that of AA 10 mu M to 2000 mu M, with correlation coefficients of 0.9930 and 0.9945, respectively. The linear range is much wider than previously reported.
机译：在含有十六烷基三甲基溴化铵CTAB修饰玻碳电极的壳聚糖上，在中性pH下同时测定神经递质，多巴胺（DA）和抗坏血酸（AA）。微分脉冲伏安法（DPV）技术用于研究DA和AA在掺有CTAB的壳聚糖修饰的玻碳电极上的电化学响应。最佳的6.0 mmol L-1 CTAB和0.5 wt％的脱乙酰壳多糖用于提高分离度和测定灵敏度。在pH 6.8的0.1mol L-1磷酸盐水溶液中，壳聚糖-CTAB修饰的电极对DA和AA表现出良好的电催化响应。 DA的阳极峰电位正向移动，而AA的阳极峰负向移动。因此，DA和AA的阳极峰之差达到0.23 V，足以很好地分离两个阳极峰。本文提出的方法可以应用于直接同时测定DA和AA，而无需事先处理。 DPV的阳极峰值电流（I-pa）在8μM至1000μM的浓度范围内与DA成正比，与10μM至2000μM的AA浓度范围内成正比，相关系数分别为0.9930和0.9945。线性范围比以前报道的要宽得多。

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