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An electrochemiluminescence aptasensor switch for aldicarb recognition via ruthenium complex-modified dendrimers on multiwalled carbon nanotubes

文献类型： 外文期刊

作者： Li, Shuhuai 1 ; Liu, Chunhua 1 ; Han, Bingjun 1 ; Luo, Jinhui 1 ; Yin, Guihao 1 ;

作者机构： 1.Chinese Acad Trop Agr Sci, Anal & Test Ctr, Haikou 571101, Peoples R China

2.Hainan Prov Key Lab Qual & Safety Trop Fruits & V, Haikou 571101, Peoples R China

关键词： Pesticide residue;Cyclic voltammetry;Electrochemical impedance spectroscopy;Transmission electron microscopy;X-ray diffraction;X-ray photoelectron spectroscopy

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： 2017 年 184 卷 6 期

页码：

收录情况： SCI

摘要： The authors describe an electrochemiluminescence (ECL) based aptasensor for the pesticide aldicarb. The method is based on effective ECL energy transfer that occurs between the ruthenium(II) bipyridyl complex [referred to as Ru(bpy)(3) (2+)] and gold nanoparticles (AuNPs). More specifically, multiwalled carbon nanotubes were modified with dendritic poly(L-arginine) labeled with Ru(bpy)(3) (2+), and the aptamers were taggedd with AuNPs. In the absence of aldicarb, the ECL emitted by Ru(bpy)(3) (2+) is enhanced by AuNPs under peak wavelength at at a wavelength of 610 nm. In the presence of aldicarb, the capture and competitive binding of aldicarb to the DNA aptamers causes their separation from the DPA6/Ru(bpy)(3) (2+)/MWCNT. As a result, ECL intensity decreases linearly with increasing aldicarb concentrations in the range between 40 pM and 4 nM, with a detection limit of 9.6 pM. This aptamer switch is highly sensitive, selective and inexpensive. Conceivably, it can be adapted to formats for the determination of other pesticide residues by using different DNA aptamers.

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