PMID: 3745950Mar 1, 1986Paper

Lipid thermotropic transitions in human stratum corneum

The Journal of Investigative Dermatology
G M GoldenR O Potts

Abstract

The techniques of differential scanning calorimetry (DSC) and thermal perturbation infrared (IR) spectrometry were used to investigate thermal transitions in intact, fractionated, and lipid-extracted human stratum corneum. The DSC results show 3 major and one minor thermal transition in the range of 30-120 degrees C. Of particular interest to this study are 2 transitions seen near 65 degrees and 75 degrees C in intact stratum corneum and a stratum corneum membrane preparation, but absent from lipid-extracted samples. Results of IR spectrometry show that thermally induced spectral changes related to enhanced motion of the lipid acyl chains also occur in the region of about 60-80 degrees C. The combined DSC and IR results show that the thermal transitions near 65 degrees and 75 degrees C depend on water concentration in a manner identical to that seen for a variety of lipid-water systems. Taken together, these results suggest that thermal transitions occurring near 65 degrees and 85 degrees C involve increased acyl chain motion of stratum corneum lipids.

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