Publicação: Structural and thermal characterization of dioctadecyldimethylammonium bromide dispersions by spin labels
dc.contributor.author | Benatti, C. R. | |
dc.contributor.author | Feitosa, E. | |
dc.contributor.author | Fernandez, R. M. | |
dc.contributor.author | Lamy-Freund, M. T. | |
dc.contributor.institution | Universidade Estadual Paulista (Unesp) | |
dc.contributor.institution | Universidade de São Paulo (USP) | |
dc.date.accessioned | 2014-05-20T14:02:20Z | |
dc.date.available | 2014-05-20T14:02:20Z | |
dc.date.issued | 2001-06-01 | |
dc.description.abstract | Dioctadecyldimethylammonium 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.affiliation | UNESP, IBILCE, Dept Phys, BR-15054000 São Paulo, Brazil | |
dc.description.affiliation | Univ São Paulo, Inst Fis, BR-05315970 São Paulo, Brazil | |
dc.description.affiliationUnesp | UNESP, IBILCE, Dept Phys, BR-15054000 São Paulo, Brazil | |
dc.format.extent | 93-104 | |
dc.identifier | http://dx.doi.org/10.1016/S0009-3084(01)00134-7 | |
dc.identifier.citation | Chemistry and Physics of Lipids. Clare: Elsevier Sci Ireland Ltd, v. 111, n. 2, p. 93-104, 2001. | |
dc.identifier.doi | 10.1016/S0009-3084(01)00134-7 | |
dc.identifier.issn | 0009-3084 | |
dc.identifier.uri | http://hdl.handle.net/11449/21970 | |
dc.identifier.wos | WOS:000170327100001 | |
dc.language.iso | eng | |
dc.publisher | Elsevier B.V. | |
dc.relation.ispartof | Chemistry and Physics of Lipids | |
dc.relation.ispartofjcr | 2.766 | |
dc.relation.ispartofsjr | 1,220 | |
dc.rights.accessRights | Acesso restrito | |
dc.source | Web of Science | |
dc.subject | dioctadecyldimethylammonium bromide | pt |
dc.subject | spin label | pt |
dc.subject | Cationic vesicle | pt |
dc.subject | thermal analyses | pt |
dc.subject | melting temperature | pt |
dc.title | Structural and thermal characterization of dioctadecyldimethylammonium bromide dispersions by spin labels | en |
dc.type | Artigo | |
dcterms.license | http://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy | |
dcterms.rightsHolder | Elsevier B.V. | |
dspace.entity.type | Publication | |
unesp.campus | Universidade Estadual Paulista (UNESP), Instituto de Biociências, Letras e Ciências Exatas, São José do Rio Preto | pt |
unesp.department | Física - IBILCE | pt |
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