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首页> 外文期刊>Analytica chimica acta >Simultaneous determination of tyrosine and tryptophan by mesoporous silica nanoparticles modified carbon paste electrode using H-point standard addition method
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Simultaneous determination of tyrosine and tryptophan by mesoporous silica nanoparticles modified carbon paste electrode using H-point standard addition method

机译：H点标准添加法介孔二氧化硅纳米粒子修饰的碳糊电极同时测定酪氨酸和色氨酸

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摘要

A simple, selective and sensitive sensor based on mesoporous silica nanoparticles modified carbon paste electrode (MSNs/CPE) is introduced for electrochemical determination of tyrosine (Tyr) and tryptophan (Trp). Compared with the unmodified electrode and commercial SiO2 modified electrode (SiO2/CPE), the oxidation peak current significantly improved for both amino acids. Under optimized experimental conditions, the oxidation peak current of Trp was linear over a concentration range of 5.0 x 10(-8) to 4.0 x 10(-4) M with a detection limit of 3.4 x 10(-8) M. The oxidation peak current of Tyr was linear over a concentration range from 5.0 < 10(-7) to 6.0 < 10(-4) M with a detection limit of 1.5 10(-7) M. For simultaneous determination Trp and Tyr, H-point standard addition method was applied to resolve the overlapping of differential pulse voltammetric peaks of Trp and Tyr. The results showed that the method was successfully applied to the simultaneous determination of Trp and Tyr in some synthetic samples. Moreover, the applicability of the method was demonstrated by the recovery tests of Trp and Tyr in artificial urine. (C) 2015 Published by Elsevier B.V.
机译：介绍了一种基于介孔二氧化硅纳米粒子修饰碳糊电极（MSNs / CPE）的简单，选择性和灵敏的传感器，用于电化学测定酪氨酸（Tyr）和色氨酸（Trp）。与未修饰电极和商用SiO2修饰电极（SiO2 / CPE）相比，两种氨基酸的氧化峰电流均得到显着改善。在优化的实验条件下，Trp的氧化峰值电流在5.0 x 10（-8）至4.0 x 10（-4）M的浓度范围内呈线性，检测极限为3.4 x 10（-8）M。 Tyr的峰值电流在5.0 <10（-7）至6.0 <10（-4）M的浓度范围内呈线性，检出限为1.5 10（-7）M。对于同时测定Trp和Tyr，H点采用标准加法解决了Trp和Tyr的差分脉冲伏安峰的重叠问题。结果表明，该方法已成功地用于同时测定某些合成样品中的Trp和Tyr。此外，该方法的适用性通过人工尿液中Trp和Tyr的回收率测试证明。 （C）2015由Elsevier B.V.发布

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