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首页> 外文期刊>Journal of the Brazilian Chemical Society >Tryptophan determination at carbon fiber ultramicroelectrodes by fast-scan cyclic voltammetry
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Tryptophan determination at carbon fiber ultramicroelectrodes by fast-scan cyclic voltammetry

机译：碳纤维超微电极中色氨酸的快速扫描循环伏安法测定

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摘要

Tryptophan determination using a fast-scan voltammetric method at carbon fiber ultramicroelectrodes (CF-UME) is described. CF-UME electrode was submitted to electrochemical pretreatment. Parameters such as number of acquisition cycles, scan rate, potential interval and electrochemical surface pretreatment were optimized. Under optimized conditions, three analytical curves were obtained for tryptophan (between 30 and 300 μmol L-1) using three different CF-UMEs pretreated by means of an optimized electrochemical treatment procedure. It was observed a dependence on the sensitivity and tryptophan concentration linear range with the radius of the electrode, with limits of detection between 16.7 and 22.7 μmol L-1. The method was applied in the determination of tryptophan in commercial samples, with errors between -0.99 and +13.2% in relation to a comparative method.
机译：描述了在碳纤维超微电极（CF-UME）上使用快速扫描伏安法测定色氨酸的方法。 CF-UME电极已进行电化学预处理。优化了诸如采集周期数，扫描速率，电势间隔和电化学表面预处理等参数。在优化的条件下，使用通过优化的电化学处理程序进行预处理的三种不同的CF-UME，获得了色氨酸（30至300μmolL-1之间）的三个分析曲线。观察到灵敏度和色氨酸浓度线性范围与电极半径有关，检测极限在16.7和22.7μmolL-1之间。该方法用于商业样品中色氨酸的测定，相对于比较法，其误差在-0.99至+ 13.2％之间。

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