Highly Sensitive and Selective Fluorescence “Turn-On” Detection of Pb (II) Based on Fe3O4@Au–FITC Nanocomposite |
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| Authors: | Yina Cai Binxue Ren Chifang Peng Cunzheng Zhang Xinlin Wei |
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| Institution: | 1.Jiangsu Key Laboratory for Food Quality and Safety-State Key Laboratory Cultivation Base, Ministry of Science and Technology, Nanjing 210014, China;2.Food Inspection and Quarantine Centre, Shenzhen Customs, Shenzhen 518045, China;3.School of Food Science and Technology, Jiangnan University, Wuxi 214122, China;4.School of Agriculture and Biology, Shanghai Jiaotong University, Shanghai 200240, China; |
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| Abstract: | New nanocomposites, Fe3O4@Au–FITC, were prepared and explored to develop a fluorescent detection of Pb2+. The Fe3O4@AuNPs–FITC nanocomposites could be etched by Pb2+ in the presence of Na2S2O3, leading to fluorescence recovery of FITC quenched by Fe3O4@Au nanocomposites. With the increase of Pb2+ concentration, the fluorescence recovery of Fe3O4@AuNPs–FITC increased gradually. Under optimized conditions, a detection limit of 5.2 nmol/L of Pb2+ with a linear range of 0.02–2.0 µmol/L were obtained. The assay demonstrated negligible response to common metal ions. Recoveries of 98.2–106.4% were obtained when this fluorescent method was applied in detecting Pb2+ spiked in a lake-water sample. The above results demonstrated the high potential of ion-induced nanomaterial etching in developing robust fluorescent assays. |
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| Keywords: | gold nanoparticles magnetic nanoparticles FRET nanomaterial etching lead ions |
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