Stability of polydopamine and poly(DOPA) melanin-like films on the surface of polymer membranes under strongly acidic and alkaline conditions

- The stability of melanin-like films is influenced by the pH of the ambient solution.
- The stability is also influenced by the type of catecholamine and substrate.
- Unreacted dopamine or DOPA monomers could release from the film.
- Polydopamine or poly(DOPA) detached from the film in acidic or alkaline solutions.
- The stability of the films could be enhanced by oxidation of freshly formed films.