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Fluorometric determination of lead(II) by using aptamer-functionalized upconversion nanoparticles and magnetite-modified gold nanoparticles

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Abstract

A fluorescent nanoprobe for Pb(II) has been developed by employing aptamer-functionalized upconversion nanoparticles (UCNPs) and magnetic Fe3O4-modified (MNPs) gold nanoparticles (GNPs). First, aptamer-functionalized UCNPs and aptamer-functionalized magnetic GNPs were synthesized to obtained the fluorescent nanoprobe. The particles were combined by adding a complementary ssDNA. In the absence of Pb(II), the UCNPs, MNPs and GNPs are linked via complementary base pairing. This led to a decrease in the green upconversion fluorescence peaking at 547 nm (under 980 nm excitation). In the presence of Pb(II), the dsDNA between UCNPs and MNPs-GNPs is cleaved, and fluorescence recovers. This effect allows Pb(II) to be quantified, with a wide working range of 25–1400 nM and a lower detection limit of 5.7 nM. The nanoprobe gave satisfactory results when analyzing Pb(II) in tea and waste water.

Schematic representation of fluorescent nanoprobe based on fluorescence resonance energy transfer (FRET) between upconversion nanoparticles (UCNPs) and gold nanoparticles (GNPs)-Fe3O4 magnetic nanoparticles (MNPs) for detection of Pb2+.

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Acknowlegements

This research is supported by the National Natural Science Foundation of China (31972154, 31901772), the 333 High-level Talents Project of Jiangsu Province (BRA2019087), the Key R&D Program of Jiangsu Province (BE2017357), and the China Postdoctoral Science Foundation (2019 M651748).

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Chen, M., Hassan, M., Li, H. et al. Fluorometric determination of lead(II) by using aptamer-functionalized upconversion nanoparticles and magnetite-modified gold nanoparticles. Microchim Acta 187, 85 (2020). https://doi.org/10.1007/s00604-019-4030-4

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