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Dissociation constants of major groups in natural melanin*.
| Equilibria | −logKa (SD) |
|---|---|
| [Ac−][H+]/[HAc] | 4.35 (0.10) |
| [Qi−][H+]/[HQi] | 6.30 (0.08) |
| [HCat−][H+]/[H2Cat] | 10.50 (0.12) |
| [Cat2−][H+]/[HCat−] | 12.81 (0.09) |
*Obtained by fitting the average of three or more titrations.
