Electrochemiluminescence aptasensor for multiple determination of Hg2+ and Pb2+ ions by using the MIL-53(Al)@CdTe-PEI modified electrode
An aptasensor based on MIL-53(Al)@CdTe was designed for multiple determination of Hg2+ and Pb2+ by electrochemiluminescence (ECL). Upon the recognition of Hg2+, aptamer 2-AuNPs form hairpin structures and are removed from the electrode. While in the presence of Pb2+, aptamer 1-PtNPs capture the targ...
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Veröffentlicht in: | Analytica chimica acta 2020-03, Vol.1100, p.232-239 |
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Sprache: | eng |
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Zusammenfassung: | An aptasensor based on MIL-53(Al)@CdTe was designed for multiple determination of Hg2+ and Pb2+ by electrochemiluminescence (ECL). Upon the recognition of Hg2+, aptamer 2-AuNPs form hairpin structures and are removed from the electrode. While in the presence of Pb2+, aptamer 1-PtNPs capture the target ions and form G-quadruplexes, and then bring PtNPs close enough to CdTe QDs to produce ECL resonance energy transfer. Upon aptamer interaction with Hg2+ and Pb2+, decreased ECL intensity was observed due to enhanced resonance energy transfer (ERET) and attenuated surface plasmon resonance (SPR). The ECL intensity difference (ΔECL) could therefore be used to detect heavy-metal ions with detection limits of 4.1 × 10−12 M (path 1, Hg2+), 3.7 × 10−11 M (path 2, Pb2+), and 2.4 × 10−11 M (path 3, Pb2+). The aptasensor could also be used for detecting Hg2+ and Pb2+ in fish and shrimp samples with good recoveries.
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•The Hg2+ and Pb2+ were multiple detected by aptasensor which modified with single luminophore.•MIL-53(Al)@CdTe-PEI not only saved the mount of CdTe QDs, but also had excellent electrochemical performance.•The proposed method indicated multiple detection performance, low detection limit and wide linearity. |
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ISSN: | 0003-2670 1873-4324 |
DOI: | 10.1016/j.aca.2019.11.069 |