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Influence of Cyclosporine A on molecular interactions in lyotropic reverse hexagonal liquid crystals

Journal of Physical Chemistry B, ISSN: 1520-5207, Vol: 114, Issue: 40, Page: 12785-12791
2010
  • 14
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  • 19
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Metrics Details

  • Citations
    14
    • Citation Indexes
      14
  • Captures
    19

Article Description

We present a dielectric study of H mesophases (H) based on a GMO/tricaprylin/phosphatidylcholine/water system seeded with the peptide Cyclosporine A (CSA). The study covers a frequency range 0.01 Hz to 1 MHz and a temperature range of 293 to 319 K, with a 3 K temperature step. Three dielectric relaxation processes are observed and discussed. This picture is further elucidated by comparison with a dielectric study of the empty H mesophase system, previously published, where the same three processes were involved. A complex picture emerges whereby the CSA is intercalated between the surfactant tails yet protrudes into the interface as well. Whereas the CSA remains hydrophobic, it still influences the relaxation behavior of the GMO head and counterion movement along the interface in a nontrivial manner. The third dipolar species, the tricaprylin molecule, is also influenced by the presence of CSA. A critical temperature T = 307 K is recognized and identified as the dehydration temperature of the surfactant heads. This induces a conformal transition in the CSA, drastically changing its effect on the three dielectric processes evident in the raw data. The implications of this behavior are discussed in detail. © 2010 American Chemical Society.

Bibliographic Details

Ben Ishai, Paul; Libster, Dima; Aserin, Abraham; Garti, Nissim; Feldman, Yuri

American Chemical Society (ACS)

Chemistry; Materials Science

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