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. Author manuscript; available in PMC: 2015 Dec 14.
Published in final edited form as: Polyhedron. 2014 Dec 14;84:150–159. doi: 10.1016/j.poly.2014.07.005

Figure 7.

Figure 7

Electrocatalytic cycle between DNA tethered MB and freely-diffusing hemoglobin. As MB is reduced to LB, its affinity for DNA is significantly decreased, resulting in LB dissociation from the duplex. The LB is then reoxidized by hemoglobin in solution while maintaining surface passivation. The amino acids of the hemoglobin shell provide an inherent passivator between the iron center and electrode surface. The chronocoulometry of the system is shown. In red is the signal resulting from electrocatalysis, while in black is the MB-DNA without hemoglobin, and in grey is unmodified DNA duplex.