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Polymorphism in stratum corneum lipids

B Ongpipattanakul1, M L Francoeur, R O Potts

  • 1Department of Pharmaceutics, School of Pharmacy, University of Wisconsin, Madison.

Biochimica Et Biophysica Acta
|February 23, 1994
PubMed
Summary
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Stratum corneum lipids exhibit complex polymorphic phase behavior below their main transition temperature, suggesting crystalline mixtures and solid-liquid phases. This behavior is similar to cholesterol-containing phospholipids, indicating cholesterol

Area of Science:

  • Biophysics
  • Materials Science
  • Dermatology

Background:

  • The stratum corneum (SC), the skin's outer layer, possesses unique lipid properties crucial for its barrier function.
  • SC lipids, composed of cholesterol, fatty acids, and ceramides, form extracellular multilamellar sheets.
  • These lipids are vital for the skin's electrical and transport resistance.

Purpose of the Study:

  • To investigate the thermotropic phase behavior of stratum corneum lipid multilamellae.
  • To understand the structural organization and phase transitions of SC lipids.

Main Methods:

  • Fourier Transform Infrared (FTIR) spectroscopy was utilized to analyze SC lipid multilamellae.
  • Analysis focused on symmetric CH2 stretching and CH2 scissoring vibrations.

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Main Results:

  • FTIR data indicate that SC lipids exhibit polymorphic phase behavior below the main phase transition temperature.
  • Multiple phases, likely crystalline mixtures with varied alkyl chain packings and solid-liquid phases, were observed.
  • Similarities were found between SC lipid FTIR results and cholesterol-containing phospholipid systems.

Conclusions:

  • SC lipids display complex phase behavior, suggesting a mixture of crystalline and solid-liquid phases.
  • The observed behavior implies a non-uniform distribution of cholesterol within the SC lipid system.
  • These findings contribute to understanding skin barrier function and lipid organization.