Interaction of sodium cholate with dioctadecyldimethylammonium chloride vesicles in aqueous dispersion

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dc.contributor.authorAlves, Fernanda Rosa
dc.contributor.authorFeitosa, Eloi
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-20T14:02:18Z
dc.date.available2014-05-20T14:02:18Z
dc.date.issued2006-11-15
dc.description.abstractMixtures of dioctadecyldimethylammonium chloride (DODAC) cationic vesicle dispersions with aqueous micelle solutions of the anionic sodium cholate (NaC) were investigated by differential scanning calorimetry, DSC, turbidity and light scattering. Within the concentration range investigated (constant 1.0 mM DODAC and varying NaC concentration up to 4 mM), vesicle -> micelle -> aggregate transitions were observed. The turbidity of DODAC/NaC/water depends on time and NaC/DODAB molar concentration ratio R. At equilibrium, turbidity initially decreases smoothly with R to a low value (owing to the vesicle-micelle transition) when R = 0.5-0.8 and then increases steeply to a high value (owing to the micelle-aggregate transition) when R = 0.9-1.0. DSC thermograms exhibit a single and sharp endothermic peak at T-m approximate to 49 degrees C, characteristic of the melting temperature of neat DODAC vesicles in water. Upon addition of NaC, T-m initially decreases to vanish around R = 0.5, and the main transition peak broadens as R increases. For R > 1.0 two new (endo- and exothermic) peaks appear at lower temperatures indicating the formation of large aggregates since the dispersion is turbid. All samples are non-birefringent. Dynamic light scattering (DLS) data indicate that both DODAC and DODAC/NaC dispersions are highly polydisperse, and that the mean size of the aggregates tends to decrease as R increases. (c) 2006 Elsevier B.V. All rights reserved.en
dc.description.affiliationUNESP, IBILCE, Dept Phys, BR-15054000 Sao Jose do Rio Preto, SP, Brazil
dc.description.affiliationUnespUNESP, IBILCE, Dept Phys, BR-15054000 Sao Jose do Rio Preto, SP, Brazil
dc.format.extent76-80
dc.identifierhttp://dx.doi.org/10.1016/j.tca.2006.08.003
dc.identifier.citationThermochimica Acta. Amsterdam: Elsevier B.V., v. 450, n. 1-2, p. 76-80, 2006.
dc.identifier.doi10.1016/j.tca.2006.08.003
dc.identifier.issn0040-6031
dc.identifier.urihttp://hdl.handle.net/11449/21959
dc.identifier.wosWOS:000242290300016
dc.language.isoeng
dc.publisherElsevier B.V.
dc.relation.ispartofThermochimica Acta
dc.relation.ispartofjcr2.189
dc.relation.ispartofsjr0,605
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectvesiclept
dc.subjectmicellept
dc.subjectvesicle-micelle transitionpt
dc.subjectlight scatteringpt
dc.subjectdifferential scanning calorimetrypt
dc.subjectturbiditypt
dc.subjectDODACpt
dc.subjectbile saltspt
dc.subjectsodium cholatept
dc.titleInteraction of sodium cholate with dioctadecyldimethylammonium chloride vesicles in aqueous dispersionen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderElsevier B.V.
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Biociências Letras e Ciências Exatas, São José do Rio Pretopt

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