Abstract
The thermotropic phase behavior of lipids extracted either in vivo from inner forearm (SCLE) or plantar callus (PC) was investigated by differential scanning calorimetry and small angle X-ray diffraction. PC composition was chromatographically modified (MPC) by eliminating the more polar lipids in order to evaluate their role. Analysis of composition confirms the potential use of PC as a source of stratum corneum lipids. MPC and SCLE exhibit similar differential scanning calorimetry (DSC) profiles with a main transition around 50°C attributed to the solid-to-liquid phase transition of the ceramides. The absence of a transition around 50°C for PC suggests the possible perturbation of ceramide packing by the significantly high proportion of phospholipids. X-ray data suggest a high miscibility of sebum components in stratum corneum lipids with possible modification of chain packing. The MPC patterns show a lipid phase separation which underscores the role of polar lipids in cholesterol/free fatty acids/sterol esters/ceramides structural cohesion.
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Abbreviations
- DSC:
-
differential scanning calorimetry
- FFA:
-
free fatty acids
- HPTLC-AMD:
-
high-performance thin-layer chromatography-automated multiple development
- MPC:
-
modified plantar callus extract
- PC:
-
plantar callus
- SC:
-
stratum corneum
- SCLE:
-
stratum corneum lipid extract
- TG:
-
triglycerides
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Bonté, F., Pinguet, P., Saunois, A. et al. Thermotropic phase behavior of in vivo extracted human stratum corneum lipids. Lipids 32, 653–660 (1997). https://doi.org/10.1007/s11745-997-0083-3
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DOI: https://doi.org/10.1007/s11745-997-0083-3