Issue 35, 2011

On the interpretation of transport properties of sodium cholate and sodium deoxycholate in binary and ternary aqueous mixtures

Abstract

Sodium cholate (NaC) and sodium deoxycholate (NaDC) in binary and ternary aqueous mixtures were investigated by means of surface tension, electron paramagnetic resonance spectroscopy (EPR), small angle neutron scattering (SANS) and mutual diffusion coefficient analysis. Concerning the NaC–H2O and NaDC–H2O binary mixtures, the surface tension, EPR and diffusion measurements confirmed the formation of micelles above a well detectable critical concentration. The SANS data indicated for both systems, the formation of ellipsoidal micelles whose major axis increased with concentration and minor axis remained constant. The data were interpreted under the assumption that aggregate growth occurred viahydrogen bonding of small aggregates along one preferential direction. For the NaC–NaDC–H2O ternary mixtures, the surface tension and EPR results were in good agreement with the Clint model prediction for the ideal mixed micellization. Based on this model, the SANS data enabled a complete description of the mixed aggregates in terms of dimensions, composition and concentration. In turn, this strategy allowed for a satisfactory interpretation of the main and cross-term diffusion coefficient trends, which are quite complex.

Graphical abstract: On the interpretation of transport properties of sodium cholate and sodium deoxycholate in binary and ternary aqueous mixtures

Supplementary files

Article information

Article type
Paper
Submitted
25 Mar 2011
Accepted
04 Jul 2011
First published
08 Aug 2011

Phys. Chem. Chem. Phys., 2011,13, 15906-15917

On the interpretation of transport properties of sodium cholate and sodium deoxycholate in binary and ternary aqueous mixtures

G. Mangiapia, G. D'Errico, F. Capuano, O. Ortona, R. K. Heenan, L. Paduano and R. Sartorio, Phys. Chem. Chem. Phys., 2011, 13, 15906 DOI: 10.1039/C1CP20922A

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