Formação de micelas mistas entre o sal biliar colato de sódio e o surfactante aniônico dodecanoato de sódio Mixed micelles formation between bile salt sodium cholate and the anionic surfactant sodium dodecanoate

Mixed-micelle formation between sodium chlolate (NaC) and the anionic surfactant sodium dodecanoate (SDoD) in Tris-HCl buffer solutions, pH 9.00, varying the molar fraction of the surfactants, was investigated by means of electrical conductivity and steady-state fluorescence of pyrene. The critical...

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Bibliographic Details
Published inQuímica nova Vol. 31; no. 8; pp. 2065 - 2070
Main Authors Renato Eising, Silvane Morés, Ismael C. Bellettini, Arlindo C. Felippe, Alexandre G. Dal-Bó, Dino Zanette
Format Journal Article
LanguageEnglish
Published Sociedade Brasileira de Química 01.01.2008
Subjects
electrical conductivity
NaC-SDoD mixed micelles
pyrene fluorescence
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Summary:Mixed-micelle formation between sodium chlolate (NaC) and the anionic surfactant sodium dodecanoate (SDoD) in Tris-HCl buffer solutions, pH 9.00, varying the molar fraction of the surfactants, was investigated by means of electrical conductivity and steady-state fluorescence of pyrene. The critical micelar concentration (cmc) was measured from the equivalent conductance versus the square root of the molar surfactant concentration plots and the regular solution theory (RST) was used to predict the mixing behavior. The I1/I3 pyrene ratio-surfactant concentration plots were used as an additional technique to follow the behavior and the changes in the micropolarity of the mixed micelles.
ISSN:0100-4042
1678-7064
DOI:10.1590/S0100-40422008000800029