A microfluidic chip containing a molecularly imprinted polymer and a DNA aptamer for voltammetric determination of carbofuran
文献类型： 外文期刊
作者： Li, Shuhuai 1 ; Li, Jianping 3 ; Luo, Jinhui 1 ; Xu, Zhi 1 ; Ma, Xionghui 1 ;
作者机构： 1.Chinese Acad Trop Agr Sci, Anal & Test Ctr, Haikou 571101, Hainan, Peoples R China
2.Hainan Prov Key Lab Qual & Safety Trop Fruits & V, Haikou 571101, Hainan, Peoples R China
3.Guilin Univ Technol, Coll Chem & Bioengn, Guilin 541004, Peoples R China
关键词： X-ray photoelectron spectroscopy; Transmission electron microscopy; X-ray diffraction; Fourier transform infrared spectra; Differential pulse voltammetry; Ultraviolet-visible absorption spectroscopy; Polydimethylsiloxane; Graphene oxide; Gold nanoparticles; Pesticide residues
期刊名称：MICROCHIMICA ACTA （ 影响因子：5.833； 五年影响因子：5.357 ）
ISSN： 0026-3672
年卷期： 2018 年 185 卷 6 期
页码：
收录情况： SCI
摘要： An electrochemical microfluidic chip is described for the determination of the insecticide carbofuran. It is making use of a molecularly imprinted film (MIP) and a DNA aptamer as dual recognition units. The analyte (carbofuran) is transported to the MIP and captured at the identification site in the channel. Then, carbofuran is eluted with carbinol-acetic acid and transported to the DNA aptamer on the testing position of the chip. It is captured again, this time by the aptamer, and detected by differential pulse voltammetry (DPV). The dual recognition (by aptamer and MIP) results in outstanding selectivity. Additionally, graphene oxide-supported gold nanoparticles (GO-AuNPs) were used to improve the sensitivity of electrochemical detector. DPV response is linear in the 0.2 to 50 nM carbofuran concentration range at a potential of -1.2 V, with a 67 pM detection limit. The method has attractive features such as its potential for high throughput, high degree of automation, and high integration. Conceivably, the method may be extended to other analytes for which appropriate MIPs and aptamers are available.
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