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首页> 外文期刊>Electroanalysis >Improved Voltammetric Response L-Tyrosine on Multiwalled Carbon Nanotubes-Ionic Liquid Composite Coated Glassy Electrodes in the Presence of Cupric Ion
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Improved Voltammetric Response L-Tyrosine on Multiwalled Carbon Nanotubes-Ionic Liquid Composite Coated Glassy Electrodes in the Presence of Cupric Ion

机译：铜离子存在下多壁碳纳米管-离子液体复合涂层玻璃电极上伏安响应的改进L-酪氨酸

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摘要

L-Tyrosine can exhibit a small anodic peak on multiwalled carbon nanotubes (MWCNTs) coated glassy carbon electrodes (GCE). At pH 5.5 its peak potential is 0.70 V (vs. SCE). When an ionic liquid (i.e., 1-octyl-3-methylimidazolium hexafluorophosphate, [omim][PF6]) is introduced on the MWCNT coat, the peak becomes bigger. Furthermore, in the presence of Cu2+ ion the anodic peak of L-tyrosine increases further due to the formation Of Cu2+- L-tyrosine complex, while the peak potential keeps unchanged. Therefore, a sensitive voltarnmetry based on the oxidation of CU2+-L-tyrosine complex on MWCNTs-[omim][PF6] composite coated electrode is developed for L-tyrosine. Under the optimized conditions, the anodic peak current is linear to L-tyrosine concentration in the range of 1 x 10(-8) -5 x 10(-6) M, and the detection limit is 8 x 10(-9) M. The modified electrode shows good reproducibility and stability. In addition, the voltarnmetric behavior of other amino acids is explored. It is found that among them tryptophan (Trp) and histidine (His) can also produce sensitive anodic peak under same experimental conditions, and their detection limits are 4 x 10(-9) M and 4 x 10(-6) M. respectively.
机译：L-酪氨酸可以在多壁碳纳米管（MWCNT）涂覆的玻璃碳电极（GCE）上显示一个小的阳极峰。在pH 5.5时，其峰值电势为0.70 V（vs. SCE）。当将离子液体（即六氟磷酸1-辛基-3-甲基咪唑鎓，[omim] [PF6]）引入MWCNT涂层时，峰变大。此外，在存在Cu 2+离子的情况下，由于形成Cu 2+ -L-酪氨酸络合物，L-酪氨酸的阳极峰进一步增加，而峰电位保持不变。因此，针对L-酪氨酸，开发了一种基于CU2 + -L-酪氨酸复合物在MWCNTs- [omim] [PF6]复合涂层电极上氧化的灵敏伏安法。在最佳条件下，阳极峰值电流与L-酪氨酸浓度呈线性关系，范围为1 x 10（-8）-5 x 10（-6）M，检测极限为8 x 10（-9）M修饰的电极显示出良好的再现性和稳定性。另外，还探索了其他氨基酸的伏安行为。发现色氨酸（Trp）和组氨酸（His）在相同的实验条件下也可以产生敏感的阳极峰，其检出限分别为4 x 10（-9）M和4 x 10（-6）M。 。

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