Figure 23.

(A) PfHRP2 immunosensor in the absence (a) and presence (b) of the target antigen with the MB-labelled detection antibody; (B) Chronocoulograms of PBS spiked with PfHRP2 recorded at 0.05 V (vs. Ag/AgCl). Reprinted from [122], Copyright 2016, with permission from Elsevier; (C) Scheme of (a) construction of signaling AuNPs by layer-by-layer alternate assembly of PDDA and PSS, and (b) sandwich immunoassay with Ag deposition and AgNPs redissolution, for CEA detection, on a chitosan/RGO-modified GC electrode; (D) Linear sweep stripping voltammetric curves of AgNPs for detection of CEA from 0 to 0.5 ng mL⁻¹. Reprinted with permission from [127]. Copyright 2012 American Chemical Society.