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. 2016 May 12;6:25774. doi: 10.1038/srep25774

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(A) Conductivity investigation of the iridium(III) complex and other organic dyes that specific to G-quadruplex in 5 mM of Fe(CN)^3−/4−: (a) Gold electrode; (b) CP/gold electrode; (c) iridium(III) complex/CP/gold electrode; (d) CV/CP/gold electrode. (e) Rhodamine/CP/gold electrode. (B) DPV of the different modified electrodes in 10 mM tris-buffer solution (pH 7.4): (a) Gold electrode; (b) Nf@MB/gold electrode; (c) (+)AuNPs/Nf@MB/gold electrode; (d) iridium(III) complex/CP/(+)AuNPs/Nf@MB/gold electrode; (e) (d) after the incubation with 1.5 nM of H₂O₂. (C) Circular dichroism of CP before (a) and after (b) the incubation of it with tris-buffer that contained 100 mM of K⁺. (D) Circular dichroism of G-quadruplex structure before (a) and after (b) the selective interaction of it with iridium(III) complex, and after the cleavage with H₂O₂ (c).