Abstract

Previously, fiber and crystal structural models were proposed for bile acid salt micellar aggregates and verified in aqueous solutions. Electromotive force (emf) measurements on sodium salts versus ionic strength, pH, and bile salt concentration provided micellar aggregate compositions that supported the models. Ionic strength was varied by adding tetramethylammonium chloride (TMACl), although tetramethylammonium (TMA+) and Na+ ions could interfere in the aggregate formation and structure. In this case emf results cannot be used for sodium salts. Tetramethylammonium (TMAGDC) and sodium glycodeoxycholate (NaGDC), which forms helical aggregates constituted by trimers, are studied to clarify this point. TMAGDC crystal structure is solved, and circular dichroism (CD), quasi-elastic light-scattering (QELS), electrolytic conductance, and dielectric measurements on TMAGDC and NaGDC aqueous solutions are compared for determining similarities and dissimilarities in their behavior. TMA+ and Na+ coordinations in TMA...

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