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Ratiometric fluorescence molecularly imprinted sensor based on dual-emission quantum dots hybrid for determination of tetracycline

  • Xiao WeiEmail author
  • Hui Chen
Research Paper
  • 56 Downloads

Abstract

A novel ratiometric fluorescence molecularly imprinted sensor based on a dual-emission quantum dot hybrid was fabricated and used as an alternative analytical tool for the detection of tetracycline. In the synthesis process, red-emitting quantum dots (r-QDs) and green-emitting quantum dots (g-QDs) were modified by two different methods. Afterward, a stepwise precipitation polymerization imprinting reaction was performed to prepare the novel ratiometric fluorescence molecularly imprinted sensor (MIP–g/r-QD sensor). The MIP–g/r-QD sensor integrated the advantages of molecularly imprinted polymers and ratiometric fluorescence probes. The specific recognition sites in the polymer layers could adsorb tetracycline molecules, and then they caused fluorescence quenching behavior of g-QDs via an electron transfer process. Under the optimal conditions, a linear relationship was obtained covering the range from 10 to 160 μmol/L, with a correlation coefficient of 0.9976 and a high imprinting factor of about 3.3. Moreover, the novel MIP–g/r-QD sensor was successfully applied to detect tetracycline in milk samples. This work provides a new way to fabricate an efficient ratiometric fluorescence molecularly imprinted sensor based on quantum dots for convenient, fast, and highly selective and sensitive detection of organic molecules.

Graphical abstract

A novel ratiometric fluorescence molecularly imprinted sensor based on a dual-emission quantum dot hybrid was fabricated and used as an alternative analytical tool for the detection of tetracycline. AIBN azoisobutyronitrile, EGDMA ethylene glycol dimethacrylate, KH-570 3-(methacryloyloxy)propyltrimethoxysilane, OVDAC octadecyl-4-vinylbenzyldimethylammonium chloride, PDDA poly(diallyldimethylammonium chloride), QD quantum dot, TEOS tetraethoxysilane

Keywords

Quantum dots Molecularly imprinted polymers Ratiometric fluorescence sensor Selective recognition Visual detection Tetracyclines 

Notes

Acknowledgements

This research was supported by the National Postdoctoral Science Foundation (no. 2017M610618), the Postdoctoral Science Foundation Funded Project of Shaanxi Province (no. 2017BSHEDZZ64), the Science and Technology Support Foundation of Shaanxi Province (no. 2018JQ2025), and the Fundamental Research Funds for the Central Universities, CHD (nos 300102298104, 300102298303, and 310829171004).

Compliance with ethical standards

Conflict of interest

The authors declare that they have no competing interests.

Supplementary material

216_2019_1963_MOESM1_ESM.pdf (1 mb)
ESM 1 (PDF 176 kb)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region, Ministry of EducationChang’an UniversityXi’anChina
  2. 2.School of Environmental Science and EngineeringChang’an UniversityXi’anChina

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