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

Figure 9. Evidence that natural pheomelanin has a greater redox-based pro-oxidant activity.

Figure 9

Three different input potentials were imposed on samples (upper panels), data were analyzed as a ratio of reductive to oxidative charge transfer (middle panels), and results with natural melanin were compared to results for mixtures of synthetic eumelanin and synthetic pheomelanin. (a) Cyclic voltammetry. (b) Chronocoulometry. (c) Cyclic voltammetry for multiple cycles.