Temperature-enhanced synthesis of DMSO-Melanin

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dc.contributor.authorPiacenti-Silva, Marina [UNESP]
dc.contributor.authorBronze-Uhle, Erika Soares [UNESP]
dc.contributor.authorPaulin, João Vitor [UNESP]
dc.contributor.authorGraeff, Carlos Frederico de Oliveira [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-12-03T13:09:01Z
dc.date.available2014-12-03T13:09:01Z
dc.date.issued2014-01-06
dc.description.abstractMelanins are a class of pigmentary conjugated macromolecules found in many biological systems. Functionalization of synthetic melanin provides interesting new properties like the greater solubility of melanin synthesized in dimethyl sulfoxide, D-Melanin. In this work we have studied the influence of temperature on D-Melanin synthesis and its properties. To this end, UV-Vis, Fourier-transform infrared (FTIR) spectroscopy and Nuclear Magnetic Resonance (NMR) techniques have been employed to analyze D-Melanin synthesized within the range of 25-100 degrees C. Our results reveal that by increasing the synthesis temperature up to 100 degrees C, the synthesis time can be decreased by a factor of 7 when compared to room temperature. From FTIR and C-13 CP/MAS NMR analyses the increase in temperature causes a decrease in the number of carbonyl groups from carboxylic acid and from ionized carboxylic acid. The decarboxylation of D-Melanin monomers at higher temperatures shows that the use of higher synthesis temperatures influences the elimination of carbonyls present in the precursor molecules, thus facilitating the polymerization of D-Melanin. (C) 2013 Elsevier B.V. All rights reserved.en
dc.description.affiliationUniv Estadual Paulista, UNESP, DF FC, BR-17033360 Bauru, SP, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, UNESP, DF FC, BR-17033360 Bauru, SP, Brazil
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.format.extent135-140
dc.identifierhttp://dx.doi.org/10.1016/j.molstruc.2013.10.041
dc.identifier.citationJournal Of Molecular Structure. Amsterdam: Elsevier Science Bv, v. 1056, p. 135-140, 2014.
dc.identifier.doi10.1016/j.molstruc.2013.10.041
dc.identifier.issn0022-2860
dc.identifier.orcid0000-0003-0162-8273
dc.identifier.urihttp://hdl.handle.net/11449/111831
dc.identifier.wosWOS:000330147900018
dc.language.isoeng
dc.publisherElsevier B.V.
dc.relation.ispartofJournal of Molecular Structure
dc.relation.ispartofjcr2.011
dc.relation.ispartofsjr0,409
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectMelaninen
dc.subjectDimethyl sulfoxideen
dc.subjectSynthesisen
dc.subjectTemperatureen
dc.subjectOptimizationen
dc.subjectPhotoabsorptionen
dc.titleTemperature-enhanced synthesis of DMSO-Melaninen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderElsevier B.V.
unesp.author.lattes5268607684223281[4]
unesp.author.orcid0000-0003-0162-8273[4]
unesp.author.orcid0000-0001-7096-3652[1]
unesp.campusUniversidade Estadual Paulista (Unesp), Faculdade de Ciências, Baurupt
unesp.departmentFísica - FCpt

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