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Oligonucleotide Functionalized Microporous Gold Electrode for the Selective and Sensitive Determination of Mercury by Differential Pulse Adsorptive Stripping Voltammetry (DPAdSV)
Analytical Letters ( IF 2 ) Pub Date : 2019-06-25 , DOI: 10.1080/00032719.2019.1631839
Xu Yiwei 1 , Li Zhihua 1 , Zhang Wen 1 , Shi Jiyong 1 , Zou Xiaobo 1 , Huang Xiaowei 1 , Hu Xuetao 1 , Wang Xin 1
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Abstract A novel electrode modified with oligonucleotide and microporous gold was fabricated for the determination of mercury by differential pulse adsorptive stripping voltammetry (DPAdSV). Microporous gold was synthesized by electrochemical reduction using dynamic hydrogen bubble template. The oligonucleotide was immobilized on microporous gold by self-assembly. The prepared electrode exhibited an improved electrochemical response for mercury(II) ion because of the large surface area and excellent electron transfer capacity provided by microporous gold and the specific coordination between mercury ion and thymine bases in oligonucleotides. Under the optimal experiment conditions, the oligonucleotide functionalized microporous gold electrode had a linear relationship between the stripping current and mercury ion concentration in the range from 0.5 to 30 µg/L with a detection limit of 0.021 µg/L. Moreover, the prepared electrode exhibited good selectivity, reproducibility, repeatability and stability. Furthermore, the prepared electrode was applied to detect mercury in tap water with satisfactory results.

中文翻译:

用于通过差分脉冲吸附溶出伏安法 (DPAdSV) 选择性和灵敏测定汞的寡核苷酸功能化微孔金电极

摘要 制备了一种新型寡核苷酸和微孔金修饰电极,用于差分脉冲吸附溶出伏安法(DPAdSV)测定汞。使用动态氢气泡模板通过电化学还原合成微孔金。寡核苷酸通过自组装固定在微孔金上。由于微孔金提供的大表面积和优异的电子转移能力以及汞离子与寡核苷酸中胸腺嘧啶碱基之间的特异性配位,所制备的电极对汞(II)离子表现出改善的电化学响应。在最佳实验条件下,寡核苷酸功能化微孔金电极的剥离电流与汞离子浓度在0 . 5 至 30 µg/L,检测限为 0.021 µg/L。此外,所制备的电极表现出良好的选择性、重现性、重复性和稳定性。此外,所制备的电极用于检测自来水中的汞,结果令人满意。
更新日期:2019-06-25
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