DODAB and DODAC bilayer-like aggregates in the micromolar surfactant concentration domain

dc.contributorUniversidade Estadual Paulista (UNESP)
dc.creatorFeitosa, Eloi
dc.creatorRosa Alves, Fernanda
dc.creatorCastanheira, Elisabete M. S.
dc.creatorOliveira, M. Elisabete C. D. Real
dc.date2014-05-20T14:02:33Z
dc.date2016-10-25T17:09:11Z
dc.date2014-05-20T14:02:33Z
dc.date2016-10-25T17:09:11Z
dc.date2009-05-01
dc.date.accessioned2017-04-05T21:27:53Z
dc.date.available2017-04-05T21:27:53Z
dc.identifierColloid and Polymer Science. New York: Springer, v. 287, n. 5, p. 591-599, 2009.
dc.identifier0303-402X
dc.identifierhttp://hdl.handle.net/11449/22052
dc.identifierhttp://acervodigital.unesp.br/handle/11449/22052
dc.identifier10.1007/s00396-009-2008-1
dc.identifierWOS:000265382800011
dc.identifierhttp://dx.doi.org/10.1007/s00396-009-2008-1
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/867517
dc.descriptionIn the millimolar concentration domain (typically 1 mM), dioctadecyldimethylammonium bromide and chloride (DODAX, X representing Br(-) or Cl(-) counterions) molecules assemble in water as large unilamellar vesicles. Differential-scanning calorimetry (DSC) is a suitable technique to obtain the melting temperature (T (m)) characteristic of surfactant bilayers, while fluorescence spectroscopy detects formation of surfactant aggregates, like bilayers. These two techniques were combined to investigate the assembly of DODAX molecules at micromolar concentrations, from 10 to 100 mu M. At 1 mM surfactant, T (m) a parts per thousand aEuro parts per thousand 45 A degrees C and 49 A degrees C, respectively, for DODAB and DODAC. DSC and fluorescence of Nile Red were used to show the formation of DODAX aggregates, at the surfactant concentration as low as 10 mu M, whose T (m) decreases monotonically with increasing DODAX concentration to attain the value for the ordinary vesicles. The data indicate that these aggregates are organized as bilayer-like structures.
dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.languageeng
dc.publisherSpringer
dc.relationColloid and Polymer Science
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectDODAB
dc.subjectDODAC
dc.subjectDSC
dc.subjectNile Red
dc.subjectCationic vesicle
dc.subjectMelting temperature
dc.subjectSteady-state fluorescence
dc.titleDODAB and DODAC bilayer-like aggregates in the micromolar surfactant concentration domain
dc.typeOtro


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