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. 2015 Dec 16;5:18447. doi: 10.1038/srep18447

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Cyclic voltammograms of films containing (a) synthetic eumelanin samples and (b) synthetic pheomelanin samples compared with the control chitosan films (scan rate of 2 mV/s) in the presence of 3 mediators. (c,d) Thermodynamic plots illustrating electron exchange between the synthetic melanins and the 3 mediators for reductive redox-cycling reaction. The D region is unique to pheomelanin. (e,f) Thermodynamic plots for oxidative-redox cycling reaction between synthetic melanins and 3 mediators.