Abstract
The authors describe a fluorescent probe for sensitive and selective determination of quercetin, an indicator for the freshness of drinks. The probe consists of silica ball encapsulated graphitic carbon nitride (g-C3N4) modified with a molecularly imprinted polymer (MIP). It was synthesized via reverse microemulsion. The resulting MIP@g-C3N4 nanocomposite was characterized by fluorescence spectroscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, and X-ray powder diffraction. Quercetin quenches the fluorescence of the MIP@g-C3N4 probe. The effect was used to quantify quercetin in grape juice, tea juice, black tea, and red wine by fluorometry (λexc = 350 nm, λem = 460 nm). Response is linear in the 10–1000 ng mL−1 quercetin concentration range. The detection limit is 2.5 ng mL−1, recoveries range between 90.7 and 94.1%, and relative standard deviations are between 2.1 and 5.5%.
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Acknowledgments
This project was funded by the Fundamental Research Funds for the Central Universities (No. 2572017 EB08), Harbin science and technology innovation talent research special funds (2016RAQXJ151) and Natural Science Foundation of Heilongjiang Province (JJ2018ZR0081).
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Xu, S., Chen, L. & Ma, L. Fluorometric determination of quercetin by using graphitic carbon nitride nanoparticles modified with a molecularly imprinted polymer. Microchim Acta 185, 492 (2018). https://doi.org/10.1007/s00604-018-3016-y
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DOI: https://doi.org/10.1007/s00604-018-3016-y