European Biophysics Journal

, Volume 24, Issue 5, pp 293–299 | Cite as

Cubic topology in surfactant and lipid mixtures

  • Sérgio S. Funari
  • Burkhard Mädler
  • Gert Rapp
Articles
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Abstract

Ternary systems of palmitoyl-oleoyl-phosphatidylcholine (POPC) and the non-ionic surfactant C12EO2 (di-ethylene-oxide-mono-dodecyl-ether) in water have been studied with optical microscopy, NMR, DSC and X-rays from ambient temperatures to 45 °C. Below 29 °C the system is in the lamellar liquid crystalline state. Between 30 and 32 °C it transforms into a cubic Ia3d structure which converts into the cubic Pn3m phase at 39 °C. The transitions are fully reversible. An epitaxial relationship between all three phases was found, which is an elegant and convenient way to rearrange molecules from lamellar bilayers to a network of curved surfaces. The la3d (Q230) to Pn3m (Q224) transition occurs without measurable enthalpy change. This, together with the metric relation of 1.60 between the cubic lattice constants is strong evidence for a Bonnet transformation, where the structural changes occur without change in curvature. The potential significance of the cubic phases as intermediate structures for biological processes, e. g. transport across a bilayer or fusion of membranes, are discussed.

Key words

Phase transition NMR DSC X-ray diffraction Bonnet Transformation 
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Copyright information

© Springer-Verlag 1996

Authors and Affiliations

  • Sérgio S. Funari
    • 1
  • Burkhard Mädler
    • 1
  • Gert Rapp
    • 2
  1. 1.Department of PhysicsUniversity of LeipzigLeipzigGermany
  2. 2.EMBL Outstation at DESYHamburgGermany

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