X-ray, Electrolytic Conductance, and Dielectric Studies of Bile Salt Micellar Aggregates
| Autor: | Francesco Punzo, Edoardo Giglio,† and, Luciano Galantini, Adalberto Bonincontro, Angelo Antonio D’Archivio |
|---|---|
| Rok vydání: | 2000 |
| Předmět: |
chemistry.chemical_classification
Aqueous solution Sodium Inorganic chemistry Salt (chemistry) chemistry.chemical_element Conductance Surfaces and Interfaces Electrolyte Dielectric Conductivity Condensed Matter Physics chemistry Micellar solutions Electrochemistry General Materials Science Spectroscopy |
| Zdroj: | Langmuir. 16:10436-10443 |
| ISSN: | 1520-5827 0743-7463 |
| DOI: | 10.1021/la000844w |
| Popis: | Previously, structural models, observed in fibers and crystals, were proposed for sodium deoxycholate (NaDC), glycodeoxycholate (NaGDC), taurodeoxycholate (NaTDC), and taurocholate (NaTC) micellar aggregates, and were verified in aqueous solutions by means of several techniques. Here we report the X-ray analysis of sodium glycocholate (NaGC) fibers, which indicates that NaGC micellar aggregates could be formed by dimers and octamers as in the case of NaTC. Moreover, we present electrolytic conductance and dielectric measurements on NaGDC, NaTC, and NaGC aqueous micellar solutions to verify our micellar aggregate models. Specific conductance values of 0.1 mol dm-3 NaDC, NaTDC, NaGDC, NaTC, and NaGC solutions containing NaCl at concentration ranging from 0 to 0.8 mol dm-3 practically do not depend on the particular bile salt. Comparison with NaCl values shows that bile salt contribution to conductance decreases by increasing NaCl concentration, is nearly zero around the concentration range 0.5−0.6 mol dm-3,... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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