期刊
BIOSENSORS & BIOELECTRONICS
卷 77, 期 -, 页码 512-517出版社
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2015.10.007
关键词
Quantum dots; Molecularly imprinted polymer; Optosensing; Dicyandiamide
类别
资金
- National Natural Science Foundation of China [31501559, 31571940]
- Talents Cultivation Fund of Beijing [2014000020124G031]
- Two Sections Cultivation Fund of Beijing Technology and Business University [LKJJ2015-19]
- Importation and Development of High-Caliber Talents Project of Beijing Municipal Institutions [CITTCD20130309, IDHT20130506]
A novel optosensing system based on quantum dots (QDs)-labeled on the surface of a molecularly imprinted polymer (MIP) was developed for turn-off fluorescence sensing of dicyandiamide (DCD). The QDs were modified with silica to covalently adhere to the MIP surface, which resulted in a higher fluorescence quantum yield than MIP-coated QDs. Under optimal conditions, there was a linear relationship, with a correlation coefficient of 0.9950, between the fluorescence intensity and the DCD concentration over the range 5-1600 mu mol L-1. The detection limit of this system was 2.7 mu mol L-1. The proposed method exhibited with good recoveries ranging from 95% to 106%. Most importantly, the optosensing approach can be successfully applied for the determination of DCD in dairy products. With excellent sensitivity and selectivity, such simple and cheap materials are potentially suitable for monitoring of DCD in other food, in agriculture and for environmental applications. (C) 2015 Elsevier B.V. All rights reserved.
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