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.
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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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DOI: https://doi.org/10.1007/s00604-019-4030-4