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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Melanin synthesis under oxygen pressure

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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

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