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- W2890727658 abstract "Current strategies for high-performance immunoassay generally require a sandwich structure for signal amplification. This strategy is limited to multivalent antigens and complicates the detection scheme. Herein we demonstrate a class of simple one-step ultrasensitive immunoassay with the adoption of double-stranded DNA (dsDNA) as “conductive spring” to bridge the electrode and redox-reporter/antibody-receptor comodified gold nanoparticles (AbFc@AuNPs). Upon biorecognition between antigen and antibody, the charge of the AuNPs changes, enhancing the electrostatic interaction between the AuNPs and Au electrode surface, and condensing the dsDNA chain. For the first time, the sensitive response of the electrochemical redox current to the DNA chain length is utilized to achieve an ultrahigh sensitivity down to fM level. Only the primary antibody needed in the recognition interface ensures the one-step immunoreaction works well with monovalent antigens, which ensure this method as a promising general alternative means for fast, high-throughput or point-of-care clinical applications even for very challenging clinically relevant samples." @default.
- W2890727658 created "2018-09-27" @default.
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- W2890727658 date "2018-09-04" @default.
- W2890727658 modified "2023-10-18" @default.
- W2890727658 title "Electrostatic Force Triggering Elastic Condensation of Double-Stranded DNA for High-Performance One-Step Immunoassay" @default.
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- W2890727658 doi "https://doi.org/10.1021/acs.analchem.8b02556" @default.
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