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首页> 外文期刊>International journal of environmental analytical chemistry >Molecularly imprinted polymer-based electrochemical sensor for the sensitive detection of glyphosate herbicide
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Molecularly imprinted polymer-based electrochemical sensor for the sensitive detection of glyphosate herbicide

机译：基于分子印迹聚合物的电化学传感器，用于草甘膦除草剂的灵敏检测

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摘要

A sensitive electrochemical molecularly imprinted sensor was developed for the detection of glyphosate (Gly), by electropolymerisation of p-aminothiophenol-functionalised gold nanoparticles in the presence of Gly as template molecule. The extraction of the template leads to the formation of cavities that are able to specifically recognise and bind Gly through hydrogen bonds between Gly molecules and aniline moieties. The performance of the developed sensor for the detection of Gly was investigated by linear sweep voltammetry using a hexacyanoferrate/hexacyanoferrite solution as redox probe, the electron transfer rate increasing when concentration of Gly increases, due to a p-doping effect. The molecularly imprinted sensor exhibits a broad linear range, between 1 pg/L and 1 mu g/L and a quantification limit of 0.8 pg/L. The selectivity of the proposed sensor was investigated towards the binding of Gly metabolite, aminomethylphosphonic acid, revealing excellent selectivity towards Gly. The developed sensor was successfully applied to detect Gly in tap water samples.
机译：开发了一种灵敏的电化学分子印迹传感器，通过在存在Gly作为模板分子的情况下对氨基苯硫酚官能化的金纳米颗粒进行电聚合来检测草甘膦（Gly）。模板的提取导致形成空腔，该空腔能够通过Gly分子与苯胺部分之间的氢键特异性识别并结合Gly。通过线性扫描伏安法，使用六氰基铁酸盐/六氰基铁氧体溶液作为氧化还原探针，研究了开发的用于检测Gly的传感器的性能，由于p掺杂效应，当Gly的浓度增加时，电子传输速率增加。分子印迹传感器的线性范围宽，介于1 pg / L和1μg / L之间，定量极限为0.8 pg / L。研究了拟议的传感器对Gly代谢产物氨基甲基膦酸结合的选择性，显示了对Gly的优异选择性。研发的传感器已成功应用于自来水样品中的Gly检测。

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