Nicola F. Della Vecchia, Roberto Avolio, Michela Alfè, Maria E. Errico, Alessandra Napolitano and Marco d'Ischia
Polydopamine is shown to consist of diverse oligomer components (up to tetramers) including uncyclized catecholamine motifs, 5,6-dihydroxyindole units, and hitherto unrecognized pyrrolecarboxylic acid moieties. Uncyclized amine units prevail with 10 × 10−3 M dopamine, and indoles/pyrroles with a 0.5 × 10−3 M concentration. Covalent incorporation of 50 × 10−3 M Tris is demonstrated. The polydopamine functionality can be tailored via o-quinone as a control point.