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A new acridone derivative 10-methyl-3-nitro-acridone (MNA) with excellent electrochemical activity was synthesized in this paper. Using it as an electrochemical indicator, a signal-on and label-free electrochemical biosensor was developed for picomolar determination of nuclear factor kappa B (NF-κB) in serum. Initially, linear double-stranded DNA (dsDNA) probes, which contain a protein-binding site...
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