FTIR spectroscopic studies of lipid dynamics in phytosphingosine ceramide models of the stratum corneum lipid matrix

Mark E. Rerek, Dina Van Wyck, Richard Mendelsohn, David J. Moore

Research output: Contribution to journalArticlepeer-review

49 Scopus citations

Abstract

IR spectroscopic studies are reported for N-stearyl-d-erythro- phytosphingosine (Cer NP) and N-stearyl-2-hydroxy-d-erythro-phytosphingosine (Cer AP) in a hydrated model of the skin lipid barrier comprised of equimolar mixtures of each ceramide with cholesterol and d35-stearic acid. Examination of the methylene stretching, rocking and bending modes reveal some rotational freedom and hexagonal packing in both the ceramide and stearic acid chains. Analysis of the acid carbonyl stretch and the ceramide Amide I modes show both shift to higher frequencies, indicating weaker hydrogen bonding, in the mixed systems compared to the pure materials. For both systems, the fatty acid chain disordering temperatures are significantly increased from those of the pure acids. The observed behaviors of these phytosphingosine ceramide systems are fundamentally different from the previously reported analogous sphingosine ceramide systems. The implications of these observations for lipid organization in the stratum corneum are briefly discussed.

Original languageEnglish (US)
Pages (from-to)51-58
Number of pages8
JournalChemistry and Physics of Lipids
Volume134
Issue number1
DOIs
StatePublished - Mar 2005

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Molecular Biology
  • Organic Chemistry
  • Cell Biology

Keywords

  • Biophysics
  • Ceramides
  • Domains
  • Skin barrier
  • Spectroscopy

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