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Microfluidic paper-based chip for parathion-methyl detection based on a double catalytic amplification strategy

文献类型： 外文期刊

作者： Li, Shuhuai 1 ; Pang, Chaohai 1 ; Ma, Xionghui 1 ; Zhang, Yanling 1 ; Xu, Zhi 1 ; Li, Jianping 2 ; Zhang, Meng 3 ; Wang, Mingyue 1 ;

作者机构： 1.Chinese Acad Trop Agr Sci, Hainan Prov Key Lab Qual & Safety Trop Fruits & V, Anal & Test Ctr, Haikou 571101, Hainan, Peoples R China

2.Guilin Univ Technol, Coll Chem & Bioengn, Guilin 541004, Peoples R China

3.Beihang Univ, Sch Elect & Informat Engn, Beijing 100191, Peoples R China

关键词： Dual catalytic amplification; Molecularly imprinted polymer; Paper chip; Parathion-methyl; Electrochemical impedance spectroscopy

期刊名称：MICROCHIMICA ACTA （ 影响因子：6.408； 五年影响因子：5.888 ）

ISSN： 0026-3672

年卷期： 2021 年 188 卷 12 期

页码：

收录情况： SCI

摘要： The rapid detection of insecticides such as parathion-methyl (PM) requires methods with high sensitivities and selectivities. Herein, a dual catalytic amplification strategy was developed using Fe3O4 nanozyme-supported carbon quantum dots and silver terephthalate metal-organic frameworks (Fe3O4/C-dots@Ag-MOFs) as current amplification elements. Based on this strategy, a novel electrochemical microfluidic paper-based chip was designed to detect PM. Fe3O4/C-dots@Ag-MOFs were synthesised by a hydrothermal method, and a molecularly imprinted polymer (MIP) was then synthesised on the surface of Fe3O4/C-dots@Ag-MOFs using PM as a template molecule. Finally, the reaction zone of a chip was modified with MIP/Fe3O4/C-dots@Ag-MOFs. PM from a sample introduced into the reaction zone was captured by the MIP, which generated a reduction current response at - 0.53 V in a three-electrode system embedded in the chip. Simultaneous catalysis by Fe3O4/C-dots and Ag-MOFs significantly enhanced the signal. The chip had a detection limit of 1.16 x 10(-11) mol L-1 and was successfully applied to the determination of PM in agricultural products and environmental samples with recovery rates ranging from 82.7 to 109%, with a relative standard deviation (RSD) of less than 5.0%. This approach of combining a dual catalytic amplification strategy with an MIP significantly increased the sensitivity as well as selectivity of chips and can potentially be used to detect a wide variety of target analytes using microfluidic paper-based chips.

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