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. 2012 Dec 6;2012:712840. doi: 10.1155/2012/712840

Table 2.

Dissociation constants of major groups in natural melanin*.

Equilibria −log⁡Ka (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.