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Cubic phases of gangliosides in water: Possible role of the conformational bistability of the headgroup

Author

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  • Boretta, M
  • Cantù, L
  • Corti, M
  • del Favero, E

Abstract

An accurate X-ray scattering study of the self-association properties in water of the ganglioside GM1, a biological amphiphile similar to phospholipids but with an oligosaccharide headgroup, is described. The phase diagram displays a large cubic region, for concentrations between 31% and 55% by weight, enclosed by isotropic micellar and lamellar phases. The peculiar feature of the GM1 molecule to present a conformational bistability, recently observed in ganglioside micelles, can be well recognized in the cubic phase region, suggesting that GM1-water behaves like a pseudoternary system, with an additional degree of freedom, automatically readjusting the mole fraction of the two conformers in order to optimize the molecular packing.

Suggested Citation

  • Boretta, M & Cantù, L & Corti, M & del Favero, E, 1997. "Cubic phases of gangliosides in water: Possible role of the conformational bistability of the headgroup," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 236(1), pages 162-176.
    • Handle: RePEc:eee:phsmap:v:236:y:1997:i:1:p:162-176
    DOI: 10.1016/S0378-4371(96)00406-2
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    1. de la Croix, David & Licandro, Omar, 1993. "Irreversibility, Uncertainty and Underemployment Equilibria," LIDAM Discussion Papers IRES 1994028, Université catholique de Louvain, Institut de Recherches Economiques et Sociales (IRES), revised 00 Oct 1994.
    2. Dodds, J.H. & Destefano-Beltran, L. & Buitron, F. & Salinas, R. & Siguenas, C. & Tovar, P. & Zambrano, V. & Jaynes, J., 1990. "Potato Transformation For Conferring Disease Resistance," 26th Annual Meeting, July 29 to August 4, 1990, Mayaguez, Puerto Rico 259232, Caribbean Food Crops Society.
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