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- W2074060742 abstract "A new enzyme-free and ultrasensitive electrochemical Pb2+ biosensor was developed. By coupling the DNA-assisted cascade of hybridization reaction with the quantum dots (QDs) for signal amplification, a detection limit as low as 6.1 pM can be obtained for Pb2+. In this study, the “8-17” DNAzyme was used for specific recognition of Pb2+. In the presence of Pb2+, the DNAzyme was activated and cleaved the substrate strand. And then, the hybridization between the linker probe and signal probe was initiated, which resulted in formation of a long cascade DNA structure as well as assemble of numerous QDs at last. By the use of magnetic beads, the free signal probe can be easily removed by external magnetic field. After acid lysis, a great amount of redox cations can be released from the QDs and eventually result in significantly amplified electrochemical signals. This method is highly sensitive, selective and simple without the participation of any protein based enzyme (nuclease), thereby holds great potential for real sample analysis." @default.
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- W2074060742 date "2014-07-01" @default.
- W2074060742 modified "2023-10-13" @default.
- W2074060742 title "A novel electrochemical sensor for lead ion based on cascade DNA and quantum dots amplification" @default.
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- W2074060742 doi "https://doi.org/10.1016/j.electacta.2014.04.021" @default.
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