Publicação:
Structural and thermal characterization of dioctadecyldimethylammonium bromide dispersions by spin labels

dc.contributor.authorBenatti, C. R.
dc.contributor.authorFeitosa, E.
dc.contributor.authorFernandez, R. M.
dc.contributor.authorLamy-Freund, M. T.
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.date.accessioned2014-05-20T14:02:20Z
dc.date.available2014-05-20T14:02:20Z
dc.date.issued2001-06-01
dc.description.abstractDioctadecyldimethylammonium bromide (DODAB) dispersions obtained by simply mixing the amphiphile in water, and by bath-sonication, were investigated by electron spin resonance (ESR) of stearic acids and their methyl ester derivatives, labeled at the 5th and 16th carbons of the acyl chain. The ESR spectra indicate that the non-sonicated dispersions are formed mainly by one population of DODAB vesicles, either in the gel (T < T-m) or in the liquid-crystalline (T > T-m) state. Around T-m there is a co-existence of the two phases, with a thermal hysteresis of about 3.2 degreesC. In sonicated DODAB dispersions, spin labels indicate two different environments even for temperatures far below T-m: one similar to that obtained with non-sonicated samples, a gel phase, and another one in the liquid-crystalline state. The fluid phase domain present below T-m could correspond to either the periphery of bilayer fragments, reported to be present in sonicated DODAB dispersions, or to high curvature vesicles. (C) 2001 Elsevier B.V. Ireland Ltd. All rights reserved.en
dc.description.affiliationUNESP, IBILCE, Dept Phys, BR-15054000 São Paulo, Brazil
dc.description.affiliationUniv São Paulo, Inst Fis, BR-05315970 São Paulo, Brazil
dc.description.affiliationUnespUNESP, IBILCE, Dept Phys, BR-15054000 São Paulo, Brazil
dc.format.extent93-104
dc.identifierhttp://dx.doi.org/10.1016/S0009-3084(01)00134-7
dc.identifier.citationChemistry and Physics of Lipids. Clare: Elsevier Sci Ireland Ltd, v. 111, n. 2, p. 93-104, 2001.
dc.identifier.doi10.1016/S0009-3084(01)00134-7
dc.identifier.issn0009-3084
dc.identifier.urihttp://hdl.handle.net/11449/21970
dc.identifier.wosWOS:000170327100001
dc.language.isoeng
dc.publisherElsevier B.V.
dc.relation.ispartofChemistry and Physics of Lipids
dc.relation.ispartofjcr2.766
dc.relation.ispartofsjr1,220
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectdioctadecyldimethylammonium bromidept
dc.subjectspin labelpt
dc.subjectCationic vesiclept
dc.subjectthermal analysespt
dc.subjectmelting temperaturept
dc.titleStructural and thermal characterization of dioctadecyldimethylammonium bromide dispersions by spin labelsen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderElsevier B.V.
dspace.entity.typePublication
unesp.campusUniversidade Estadual Paulista (UNESP), Instituto de Biociências, Letras e Ciências Exatas, São José do Rio Pretopt
unesp.departmentFísica - IBILCEpt

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