A molecular imprinting fluorescence sensor based on quantum dots and a mesoporous structure for selective and sensitive detection of 2,4-dichlorophenoxyacetic acid

SENSORS AND ACTUATORS B-CHEMICAL

卷:252

Article

Jia, Mengfan¹  Zhang, Zhong¹  Li, Jinhua²  Shao, Hongjun¹  Chen, Lingxin²  Yang, Xingbin¹ 

[1] Shaanxi Normal Univ, Coll Food Engn & Nutr Sci, Shaanxi Engn Lab Food Green Proc & Safety Control, Xian 710119, Shaanxi, Peoples R China

[2] Chinese Acad Sci, Yantai Inst Coastal Zone Res, Lab Coastal Environm Proc & Ecol Remediat, Yantai 264003, Peoples R China

关键词: 2,4-Dichlorophenoxyacetic acid;    Molecular imprinting;    Quantum dots;    Mesoporous;    Fluorescent detection;   

DOI  :  10.1016/j.snb.2017.06.090

来源: Elsevier

【 摘 要 】

A novel molecular imprinting fluorescence sensor was constructed by anchoring mesoporous structured imprinting microspheres on the surfaces of quantum dots (QDs) surface for the selective and sensitive detection of 2,4-dichlorophenoxyacetic acid (2,4-D) on the basis of an electron-transfer-induced fluorescence quenching mechanism. The resulting sensor was well characterized and had ideal spherical morphology and fluorescence properties. Under the optimized conditions, the sensor exhibited a satisfactory linearity within 0.66-80 mu M, with a low detection limit of 2.1 nM within 20 min. The sensor was successfully applied for the detection of 2,4-D in bean sprout samples, and high recoveries at three spiking levels of 2,4-D, ranging from 95.0 to 110.1%, with precisions below 4.9%, were attained. By taking advantage of surface imprinting and QDs, the sensor exhibited high sensitivity and good selectivity for the separation, enrichment and detection of 2,4-D in real food samples, thereby ensuring food safety. (C) 2017 Elsevier B.V. All rights reserved.

【 授权许可】

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