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An imprinted polymeric matrix containing DNA for electrochemical sensing of 2,4–dichlorophenoxyacetic acid
Microchimica Acta ( IF 5.3 ) Pub Date : 2019-11-19 , DOI: 10.1007/s00604-019-3980-x Fatemeh Azadmehr 1 , Kobra Zarei 1
Microchimica Acta ( IF 5.3 ) Pub Date : 2019-11-19 , DOI: 10.1007/s00604-019-3980-x Fatemeh Azadmehr 1 , Kobra Zarei 1
Affiliation
The authors describe an electrochemical method for the determination of herbicide 2,4-dichlorophenoxyacetic acid (2,4-D). It is based on the use of a molecularly imprinted polymer (MIP) and of dsDNA as a bio-specific substance. The modified electrode was prepared by electropolymerization of ortho-phenylenediamine (oPD) in the presence of DNA and of 2,4-D (the template). The imprinted MIP was placed on a pencil graphite electrode (PGE) modified with chitosan and multiwalled carbon nanotubes (MWCNTs). The template was removed with 0.4 M NaOH. The interaction of DNA with 2,4-D leads to its adsorption on the electrode, and this increases the sensitivity and selectivity of the method. After rebinding 2,4-D, the decrease in the peak current of oxidation of iron(II) acting as an electrochemical redox probe was measured by differential pulse voltammetry (DPV). The current, typically measured at around 0.5 V, increases linearly in the 0.01 to 10 pM 2,4-D concentration range, and the detection limit is 4.0 fM. The method is highly selective for 2,4-D. The modified electrode was applied to quantify 2,4-D in spiked environmental water and soil samples and gave absolute recoveries varying from 91.5 to 109.0%. Graphical abstract Schematic representation of the fabrication of an electrochemical sensor for determination of 2,4-dichlorophenoxyacetic acid (2,4-D). Initially, the electrode was modified with chitosan and MWCNTs and then a composite was formed on it consisting of ortho-phenylenediamine (oPD), DNA and 2,4-D. Schematic representation of the fabrication of an electrochemical sensor for determination of 2,4-dichlorophenoxyacetic acid (2,4-D). Initially, the electrode was modified with chitosan and MWCNTs and then a composite was formed on it consisting of ortho-phenylenediamine (oPD), DNA and 2,4-D.
中文翻译:
用于电化学传感 2,4-二氯苯氧乙酸的含有 DNA 的印迹聚合物基质
作者描述了一种测定除草剂 2,4-二氯苯氧乙酸 (2,4-D) 的电化学方法。它基于使用分子印迹聚合物 (MIP) 和 dsDNA 作为生物特异性物质。在 DNA 和 2,4-D(模板)存在下,通过邻苯二胺 (oPD) 的电聚合制备修饰电极。印迹的 MIP 被放置在用壳聚糖和多壁碳纳米管 (MWCNTs) 改性的铅笔石墨电极 (PGE) 上。模板用 0.4 M NaOH 去除。DNA 与 2,4-D 的相互作用导致其吸附在电极上,这增加了该方法的灵敏度和选择性。重新绑定 2,4-D 后,通过差分脉冲伏安法 (DPV) 测量作为电化学氧化还原探针的铁 (II) 氧化峰值电流的降低。电流通常在 0.5 V 左右测量,在 0.01 至 10 pM 2,4-D 浓度范围内线性增加,检测限为 4.0 fM。该方法对 2,4-D 具有高度选择性。改进的电极用于定量加标环境水和土壤样品中的 2,4-D,绝对回收率从 91.5% 到 109.0%。图形摘要 用于测定 2,4-二氯苯氧乙酸 (2,4-D) 的电化学传感器制造的示意图。最初,电极用壳聚糖和多壁碳纳米管修饰,然后在其上形成由邻苯二胺 (oPD)、DNA 和 2,4-D 组成的复合材料。用于测定 2,4-二氯苯氧乙酸 (2,4-D) 的电化学传感器的制造示意图。最初,电极用壳聚糖和多壁碳纳米管修饰,然后在其上形成由邻苯二胺 (oPD)、DNA 和 2,4-D 组成的复合材料。
更新日期:2019-11-19
中文翻译:
用于电化学传感 2,4-二氯苯氧乙酸的含有 DNA 的印迹聚合物基质
作者描述了一种测定除草剂 2,4-二氯苯氧乙酸 (2,4-D) 的电化学方法。它基于使用分子印迹聚合物 (MIP) 和 dsDNA 作为生物特异性物质。在 DNA 和 2,4-D(模板)存在下,通过邻苯二胺 (oPD) 的电聚合制备修饰电极。印迹的 MIP 被放置在用壳聚糖和多壁碳纳米管 (MWCNTs) 改性的铅笔石墨电极 (PGE) 上。模板用 0.4 M NaOH 去除。DNA 与 2,4-D 的相互作用导致其吸附在电极上,这增加了该方法的灵敏度和选择性。重新绑定 2,4-D 后,通过差分脉冲伏安法 (DPV) 测量作为电化学氧化还原探针的铁 (II) 氧化峰值电流的降低。电流通常在 0.5 V 左右测量,在 0.01 至 10 pM 2,4-D 浓度范围内线性增加,检测限为 4.0 fM。该方法对 2,4-D 具有高度选择性。改进的电极用于定量加标环境水和土壤样品中的 2,4-D,绝对回收率从 91.5% 到 109.0%。图形摘要 用于测定 2,4-二氯苯氧乙酸 (2,4-D) 的电化学传感器制造的示意图。最初,电极用壳聚糖和多壁碳纳米管修饰,然后在其上形成由邻苯二胺 (oPD)、DNA 和 2,4-D 组成的复合材料。用于测定 2,4-二氯苯氧乙酸 (2,4-D) 的电化学传感器的制造示意图。最初,电极用壳聚糖和多壁碳纳米管修饰,然后在其上形成由邻苯二胺 (oPD)、DNA 和 2,4-D 组成的复合材料。