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The association of sodium cholate in NaCl and urea solutions

  • Colloid Science
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Abstract

The association of sodium cholate, SC in NaCl and urea solutions at 25 °C has been investigated using laser light scattering and conductivity techniques. The light scattering results show that the mean translational diffusion coefficient, ¯D h decreases as SC and/or NaCl increase and SC forms secondary aggregates in solutions of high ionic strengths.

The addition of urea decreases the equivalent conductance, Λeq of SC and a further lowering of Λeq occurs as urea concentration increases. This effect becomes more pronounced when urea is substituted by an alkyl group and an additional decrease in Λeq is found with increasing alkyl chain and/or concentration. The present results provide the evidence that SC associates progressiveley and ureas decrease the hydrophobic interactions between the solvent and SC monomer resulting in less association in solutions.

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Author notes

  1. D. E. Güveli

    Present address: Laboratoire de Membrane et Cancer, 13 B, Institut de Recherches Scientifiques sur le Cancer, C.N.R.S., BPN∘ 8, 94802, Villejuif, France

Authors and Affiliations

  1. Postgraduate School of Pharmacy, University of Bradford, Bradford, UK

    D. E. Güveli

  2. Laboratoire de Physicochimie des Solutions, E.N.S.C.P., Université Pierre et Marie Curie, Paris, France

    D. E. Güveli

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  1. D. E. Güveli
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Güveli, D.E. The association of sodium cholate in NaCl and urea solutions. Colloid & Polymer Sci 264, 707–711 (1986). https://doi.org/10.1007/BF01469532

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  • DOI: https://doi.org/10.1007/BF01469532

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