Fig. 2. Melanin polymers were obtained from the action of A. bisporus tyrosinase on (a) l-Tyr, (b) TA, (c) l-DOPA, and (d) DA. ssNMR spectra of each melanised sample are overlaid with its original monomer, and these peaks were used for assignments. Only the 15N spectra were collected using DNP ssNMR with an enhancement ∼20. Peak assignments are provided in the ESI Fig. S2–S8.† * Denotes the spinning side bands. Bars in the SEM images represent 1 μm.
