Melanin synthesis under oxygen pressure
Full text
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| Author(s): |
Bronze-Uhle, Erika Soares
;
Paulin, Joao Vitor
;
Piacenti-Silva, Marina
;
Battocchio, Chiara
;
Miranda Rocco, Maria Luiza
;
de Oliveira Graeff, Carlos Frederico
Total Authors: 6
|
| Document type: | Journal article |
| Source: | Polymer International; v. 65, n. 11, p. 1339-1346, NOV 2016. |
| Web of Science Citations: | 4 |
| Abstract | |
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. (c) 2016 Society of Chemical Industry (AU) | |
| FAPESP's process: | 08/57872-1 - National Institute for Materials Science in Nanotechnology |
| Grantee: | Elson Longo da Silva |
| Support type: | Research Projects - Thematic Grants |
| FAPESP's process: | 13/07296-2 - CDMF - Center for the Development of Functional Materials |
| Grantee: | Elson Longo da Silva |
| Support type: | Research Grants - Research, Innovation and Dissemination Centers - RIDC |