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首页> 外文期刊>Electroanalysis >Polythymine oligonucleotide-modified gold electrode for voltammetric determination of mercury(II) in aqueous solution
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Polythymine oligonucleotide-modified gold electrode for voltammetric determination of mercury(II) in aqueous solution

机译：聚胸腺嘧啶寡核苷酸修饰的金电极伏安法测定水溶液中的汞（II）

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摘要

Polythymine oligonucleotide (PTO)-modified gold electrode (PTO/Au) was developed for selective and sensitive Hg~(2+) detection in aqueous solutions. This modified electrode was prepared by self-assembly of thiolated polythymine oligonucleotide (5′-SH-T_(15)-3′) on the gold electrode via Au-S bonds, and then the surface was passivated with 1- mercaptohexanol solution. The proposed electrode utilizes the specific binding interactions between Hg~(2+) and thymine to selectively capture Hg~(2+), thereby reducing the interference from coexistent ions. After exchanging the medium, electrochemical reduction at -0.2 V for 60 s, voltammetric determination was performed by differential pulse voltammetry using 10 mM HEPES; pH 7.2, 1 M NaClO_4 as supporting electrolyte. This electrode showed increasing voltammetric response in the range of 0.21 nM Hg~(2+), with a relative standard deviation of 5.32% and a practical detection limit of 60 pM. Compared with the conventional stripping approach, the modified electrode exhibits good sensitivity and selectivity, and is expected to be a new type of green electrode.
机译：研制了聚胸腺嘧啶寡核苷酸（PTO）修饰的金电极（PTO / Au），用于在水溶液中进行选择性和灵敏的Hg〜（2+）检测。该修饰电极通过将硫醇化聚胸腺嘧啶寡核苷酸（5'-SH-T_（15）-3'）通过Au-S键自组装在金电极上而制备，然后将表面用1-巯基己醇溶液钝化。提出的电极利用Hg〜（2+）与胸腺嘧啶之间的特异性结合相互作用来选择性地捕获Hg〜（2+），从而减少了共存离子的干扰。交换介质后，于-0.2 V电化学还原60 s，使用10 mM HEPES通过差动脉冲伏安法进行伏安测定。 pH 7.2，1 M NaClO_4作为支持电解质。该电极在0.21 nM Hg〜（2+）范围内显示出增加的伏安响应，相对标准偏差为5.32％，实际检测极限为60 pM。与传统的剥离方法相比，该修饰电极具有良好的灵敏度和选择性，有望成为一种新型的绿色电极。

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