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• W2155367951 abstract "A novel strategy for selective and sensitive amperometric detection of lead ion (Pb2+) was proposed based on target-induced strand release. The underlying gold electrode was pre-modified with dendritic gold nanoparticles by direct electrodeposition to afford increased electrode surface area for immobilization of thiol group-containing capture DNA molecules. The hybridization of the capture DNA molecules with Pb2+-specific aptamer molecules to form a DNA duplex, into which methylene blue was intercalated, induced measurable electrochemical signal. Upon addition of Pb2+, it could specifically bind to its aptamer to form Pb2+-stablized G-quadruplex and induce the aptamer strand to release from the electrode surface into solution, accompanied by the release of intercalated MB responsible for significant signal reduction. The fabricated biosensor showed a linear response to the logarithm of Pb2+ concentration over the range of 1.0 × 10−10 M to 1.0 × 10−7 M with a detection limit of 7.5 × 10−11 M. In addition, this strategy afforded an exquisite selectivity for Pb2+ against other metal ions. The excellent sensitivity and selectivity show good potential for Pb2+ detection in real environmental samples." @default.
• W2155367951 created "2016-06-24" @default.
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• W2155367951 date "2013-01-01" @default.
• W2155367951 modified "2023-09-25" @default.
• W2155367951 title "A selective amperometric sensing platform for lead based on target-induced strand release" @default.
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• W2155367951 doi "https://doi.org/10.1039/c2an36227a" @default.
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