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Analysis of PTH-Cysteine by Adsorptive Stripping Square-Wave Voltammetry

机译:吸附溶出方波伏安法分析PTH-半胱氨酸

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The aim of this work is the study of cysteine by its derivative form. Cysteine derivation is done by Edman degradation and we obtain the phenylthiohydantoin of cysteine. Edman degradation is one of the most usual procedures for sequentate proteins. From this reaction, the phenylthiohydantoin amino acid derivative (PTH-amino acid) from the N-terminal one is obtained, leaving the new amino terminus for the next degradation cycle. To identify the produced PTH-derivative, a square-wave cathodic stripping voltammetry method is developed. In this work we show the results obtained for the optimization the instrumental and chemical conditions, and we can conclude that it is ail electrochemically irreversible system with adsorptive reduction phemomenon. Under the best conditions we found a new method to analyze proteins with LOD of 2 mu g L-1 and LOQ of 5 mu g L-1, a RSD less than 10% and a E, minor than 9%. Results of the application of this methodology to a real protein are included.
机译:这项工作的目的是研究半胱氨酸的衍生物形式。半胱氨酸的衍生是通过埃德曼降解完成的,我们得到了半胱氨酸的苯硫基乙内酰脲。埃德曼(Edman)降解是序列化蛋白质最常用的方法之一。从该反应中,获得了来自N-末端的苯硫基乙内酰脲氨基酸衍生物(PTH-氨基酸),留下了新的氨基末端用于下一个降解循环。为了鉴定产生的PTH衍生物,开发了方波阴极溶出伏安法。在这项工作中,我们展示了为优化仪器和化学条件而获得的结果,并且我们可以得出结论,它是具有吸附还原现象的所有电化学不可逆系统。在最佳条件下,我们发现了一种分析蛋白质的新方法,其LOD为2μgL-1,LOQ为5μgL-1,RSD小于10%,E小于9%。包括将该方法应用于真实蛋白质的结果。

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