title: Analysis of main- and cross-term diffusion coefficients in bile salt mixtures.
abstract: Mutual diffusion coefficients have been measured for several average compositions of the system sodium cholate-sodium deoxycholate-water at 25 °C. The experiments have been grouped in different sets having constant concentration of one component and variable concentration of the other one. Following this approach, it has been found that the trends of the main- and cross-term diffusion coefficients can be interpreted on the basis of the diffusion and equilibrium results of similar experiments performed on the two binary systems sodium cholate-water and sodium deoxycholate-water. Implications of the presented results in the transport of lipids operated by bile salt aggregates are mentioned. The method proposed in this work, able to connect the diffusivities of an n-component system to those of the related n-1 subsystems, can be extended to obtain qualitative prediction on the diffusion coefficient trends for mixtures of other surfactants, of both industrial and biological interest.
authors.affiliation: Department of Chemical Sciences, University of Naples Federico II and CSGI Consorzio Interuniversitario per lo Sviluppo dei Sistemi a Grande Interfase, Complesso di Monte Sant'Angelo, Via Cintia, 80126 Naples, Italy.
authors.forename: Gaetano
authors.initials: G
authors.lastname: Mangiapia
authors.forename: Luigi
authors.initials: L
authors.lastname: Paduano
authors.forename: Ornella
authors.initials: O
authors.lastname: Ortona
authors.forename: Roberto
authors.initials: R
authors.lastname: Sartorio
authors.forename: Gerardino
authors.initials: G
authors.lastname: D'Errico
mesh_terms: D000042:Absorption; D001647:Bile Acids and Salts / Q000032:analysis / Q000737:chemistry*; D003840:Deoxycholic Acid / Q000737:chemistry; D004058:Diffusion; D008823:Micelles; D020358:Sodium Cholate / Q000737:chemistry; D013501:Surface-Active Agents / Q000737:chemistry; D014867:Water / Q000737:chemistry
chemical_list: D001647:Bile Acids and Salts; D008823:Micelles; D013501:Surface-Active Agents; D003840:Deoxycholic Acid; D014867:Water; D020358:Sodium Cholate