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Schematic representation of the analytical protocol. a) Formation of a mixed monolayer of the thiolated DNA probe (probe 1) and 6-mercapto-1-hexanol on the gold electrode. b) Hybridization of probe 1 with the target DNA. c) Hybridization of the captured DNA target with the PS-PB beads-labeled probe 2. d) Amperometric detection of hydrogen peroxide at the captured PB-loaded particles.
