An aptamer based assay for the beta-adrenergic agonist ractopamine based on aggregation of gold nanoparticles in combination with a molecularly imprinted polymer
文献类型： 外文期刊
作者： Wang, Peilong 1 ; Su, Xiaoou 1 ; Shi, Lei 2 ; Yuan, Yuwei 3 ;
作者机构： 1.Chinese Acad Agr Sci, Inst Qual Stand & Testing Technol Agroprod, Beijing 100081, Peoples R China
2.Liaoning Normal Univ, Dept Chem, Dalian 116029, Peoples R China
3.Zhejiang Acad Agr Sci, Inst Qual & Stand Agr Prod, Hangzhou 310021, Zhejiang, Peoples R China
关键词： Aptasensor;Salt-induced aggregation;Visual test;Bioassay;Molecularly imprinted membrane
期刊名称：MICROCHIMICA ACTA （ 影响因子：5.833； 五年影响因子：5.357 ）
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收录情况： SCI
摘要： A sensitive visual aptamer-based assay is presented for the determination of ractopamine (RAC) in animal feed beef. In the absence of RAC, the aptamer binds to gold nanoparticles (AuNPs) and this prevents the AuNPs to undergo salt-induced aggregation which usually is accompanied by a color change from red to blue. If however, RAC is present, it will bind to the aptamer while the AuNPs remain uncoated so that aggregation and a color change will occur due to salt-induced aggregation. This can be monitored by spectrophotometer or even with bare eyes. Under optimal conditions, the aptasensor exhibits a linear range that covers the 10 to 400 ng.mLaEuro3/4(1) RAC concentration range. The limit of detection is as low as 10 ng.mLaEuro3/4(1). In order to further improve selectivity, a RAC-selective molecularly imprinted membrane was prepared and used to pre-extract RAC from complex samples. The combined method (molecularly imprinted membrane and aptasensor) was applied to the determination of RAC in spiked animal feed and beef and gave recoveries that ranged from 72.7 % to 87.3 % for complete feed and from 78.2 % to 86.5 % for beef, respectively.
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