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We describe a highly sensitive and selective molecular beacon-based electrochemical impedance biosensor for the sequence-specific detection of DNA. DNA-capped conjugates between gold nanoparticles (Au-NPs) and streptavidin are used for signal amplification. The molecular beacon was labeled with a thiol at its 5′ end and with biotin at its 3′ end, and then immobilized on the surface of a bare gold...
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