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Scheme of the electrochemical biosensor platform and the analytical procedure: 1—sample addition to a solution containing functionalized MNPs and the detection oligonucleotide labeled with HRP enzyme; 2—hybridization assay on the MNP surface; 3—pretreated sample added to the electrochemical device; 4—steps taken place in the electrochemical device, including MNP flow, trapping and concentration, and electrochemical detection.
