Melanin synthesis under oxygen pressure
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Melanins are promising materials for organic bioelectronics devices like transistors, sensors and batteries. In this study, the chemical structural changes of melanin synthesized by the auto-oxidation of l-3,4-dihydroxyphenylalanine (l-DOPA) were analyzed for a new synthetic procedure that uses oxygen under pressure (4−8 atm). TEM, dynamic light scattering, Fourier transform IR, NMR and X-ray photoelectron spectroscopy were used to characterize the material. Under oxygen pressure, melanin synthesis is accelerated; the polymer obtained is found to have structural differences, most notably a higher number of carbonyl groups and different surface charges compared to conventional synthetic melanin. As a consequence it has higher homogeneity and is soluble in water. To explain these findings a reaction mechanism is proposed based on current melanogenesis models. © 2016 Society of Chemical Industry.
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accelerated synthesis, melanin, oxygen pressure, solubility
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Inglês
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Polymer International, v. 65, n. 11, p. 1339-1346, 2016.
