Electron paramagnetic resonance study utilizing stripping method on normal human stratum corneum

Area of Science:

• Biophysics
• Materials Science
• Dermatology

Background:

• Electron paramagnetic resonance (EPR) spectroscopy using nitroxide spin probes is valuable for studying biological membranes and their interactions with chemicals.
• The stratum corneum (SC) is the outermost layer of the skin, crucial for barrier function.

Purpose of the Study:

• To assess the fluidity of stripped stratum corneum (S-SC) from normal human skin using EPR spectroscopy.
• To establish a reliable method for measuring SC fluidity.

Main Methods:

• Quantified SC fluidity by single stripping with cyanoacrylate onto quartz glass, cover glass, or transparent film.
• Compared EPR spectra of S-SC with those of cadaver stratum corneum (C-SC).
• Evaluated spectral stability after storage at various temperatures for up to one month.

Main Results:

• EPR spectra of S-SC were comparable to C-SC.
• No significant differences in order parameters (S) were found between C-SC and S-SC on quartz or cover glass.
• S-SC on transparent film showed significantly higher order parameters.
• Spectra remained stable after one month of storage, but order parameters decreased after three months.

Conclusions:

• The developed EPR method is effective for evaluating the fluidity of stripped stratum corneum.
• The method demonstrates good stability for short-term storage.
• Further studies are needed to understand long-term stability and implications of fluidity changes.