首页> 美国卫生研究院文献>International Journal of Analytical Chemistry >Electrochemical Performances of Electroactive Nano-Layered Organic-Inorganic Perovskite Containing Trivalent Iron Ion and its Use for a DNA Biosensor Preparation
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Electrochemical Performances of Electroactive Nano-Layered Organic-Inorganic Perovskite Containing Trivalent Iron Ion and its Use for a DNA Biosensor Preparation

机译:含三价铁离子的电活性纳米层有机-无机钙钛矿的电化学性能及其在DNA生物传感器制备中的应用

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摘要

A steady nano organic-inorganic perovskite hybrid with [H23-AMP]3/2Fe(CN)6 (3-AMP = 3-methylaminopyridine) was prepared in the air. The structure is an unusual layered organic-inorganic type. The resulting hybrid enveloped in paraffin to prepare [H23-AMP]3/2Fe(CN)6 paste electrode (HPE) shows good electrochemical activity and a couple of oxidation and reduction peaks with potential of cyclic voltammometry (CV) at around 440 mV and 30 mV. Compared with that on CPE, oxidation potential of Fe(CN)6 3− on HPE shifts negatively 259.7 mV and that of reduction shifts positively 338.7 mV, which exhibits that [H23-AMP]3/2Fe(CN)6 can accelerate the electron-transfer to improve the electrochemical reaction reversibility. Such characteristics of [H23-AMP]3/2Fe(CN)6 have been employed to prepare the DNA biosensor. The single-strand DNA (ssDNA) and double-strand DNA (dsDNA) immobilized on HPE, respectively, can improve the square wave voltammometry (SWV) current and SWV potential shifts positively. The effect of pH was evaluated. And there is hybridization peak on SWV curve using HPE immobilized ssDNA in the complementary ssDNA solution. And HPE immobilized ssDNA can be utilized to monitor the DNA hybridization and detect complementary ssDNA, covering range from 3.24 × 10−7 to 6.72 × 10−5 g/mL with detection limit of 1.57 × 10−7 g/mL. The DNA biosensor exhibits a good stability and reproducibility.
机译:在空气中制备了具有[H23-AMP] 3 / 2Fe(CN)6(3-AMP = 3-甲基氨基吡啶)的稳定的纳米有机-无机钙钛矿杂化物。该结构是一种不寻常的分层有机-无机类型。生成的包裹在石蜡中的杂化物制备了[H23-AMP] 3 / 2Fe(CN)6糊状电极(HPE),具有良好的电化学活性,并且在440 mV左右具有两个循环伏安(CV)电位的氧化和还原峰。 30 mV。与CPE相比,HPE上Fe(CN)6 3 − 的氧化电位负移259.7 mV,还原电位正移338.7 mV,表明[H23-AMP] 3 / 2Fe( CN 6可以加速电子转移,提高电化学反应的可逆性。 [H23-AMP] 3 / 2Fe(CN)6的这种特性已被用于制备DNA生物传感器。固定在HPE上的单链DNA(ssDNA)和双链DNA(dsDNA)可以分别改善方波伏安法(SWV)电流和SWV电位偏移。评价了pH的影响。并且在互补ssDNA溶液中使用HPE固定的ssDNA在SWV曲线上有一个杂交峰。 HPE固定的ssDNA可用于监测DNA杂交并检测互补的ssDNA,检测范围从3.24×10 −7 到6.72×10 −5 g / mL极限为1.57×10 −7 g / mL。 DNA生物传感器具有良好的稳定性和可重复性。

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