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

• Main Authors: Renato Eising, Silvane Morés, Ismael C. Bellettini, Arlindo C. Felippe, Alexandre G. Dal-Bó, Dino Zanette
• Format: Article
• Language: English
• Published: Sociedade Brasileira de Química 2008-01-01
• Series: Química Nova
• Subjects: electrical conductivity; pyrene fluorescence; NaC-SDoD mixed micelles
• Online Access: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422008000800029
• ISSN: 0100-4042; 1678-7064

<abstract language="eng">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.