Skin barrier modification with organic solvents.

Area of Science:

• Dermatology
• Biochemistry
• Materials Science

Background:

• The stratum corneum (SC) is crucial for skin barrier function, preventing water loss and substance entry.
• SC barrier integrity relies on organized lipid lamellae in the extracellular spaces between corneocytes.
• Solvents are known to disrupt the cutaneous barrier, but their specific effects on SC lipids vary.

Purpose of the Study:

• To evaluate the distinct effects of two solvent systems, acetone and chloroform/methanol, on the stratum corneum barrier function.
• To investigate solvent-induced modifications in SC lipids using various analytical techniques.
• To understand the interaction between solvents and skin lipids for potential applications in skin repair.

Main Methods:

• Lipid extraction and analysis.
• Water sorption/desorption experiments.
• Differential Scanning Calorimetry (DSC).
• Confocal-Raman spectroscopy and Field-Scanning Transmission Electron Microscopy (FSTEM).

Main Results:

• Chloroform/methanol extracted significantly more SC lipids than acetone.
• Acetone extract exhibited lower temperature phase transitions compared to chloroform/methanol extract.
• Acetone treatment decreased SC permeability, enhancing barrier function, while chloroform/methanol increased permeability, indicating barrier disruption.
• Confocal-Raman and FSTEM imaging confirmed the presence of lipids after acetone treatment but their absence after chloroform/methanol treatment.

Conclusions:

• Acetone preserves the integrity and function of the stratum corneum barrier by maintaining SC lipids.
• Chloroform/methanol significantly disrupts the SC barrier by removing essential lipids.
• Findings enhance the understanding of lipid-solvent interactions, providing insights into mechanisms for repairing damaged skin.