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Related Experiment Video

Updated: Jul 7, 2026

Measuring and Modeling Contractile Drying in Human Stratum Corneum
08:00

Measuring and Modeling Contractile Drying in Human Stratum Corneum

Published on: March 1, 2017

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

Junichi Mizushima1, Yoshiaki Kawasaki, Takeshi Kitano

  • 1Department of Dermatology, University of California in San Francisco, San Francisco, CA, USA, and; Department of Dermatology, Tokyo Women's Medical University, Tokyo, Japan, and; Amino Science Laboratories, Ajinomoto Co., Inc., Kawasaki, Japan;; Department of Biophysics and Biochemistry, University of California in San Francisco, San Francisco, CA, USA.

Skin Research and Technology : Official Journal of International Society for Bioengineering and the Skin (ISBS) [And] International Society for Digital Imaging of Skin (ISDIS) [And] International Society for Skin Imaging (ISSI)
|June 29, 2001
PubMed
Summary

Electron paramagnetic resonance (EPR) spectroscopy effectively measures skin stratum corneum (SC) fluidity. This method is reliable for assessing SC membrane fluidity, even after storage.

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09:32

Resolving Water, Proteins, and Lipids from In Vivo Confocal Raman Spectra of Stratum Corneum through a Chemometric Approach

Published on: September 26, 2019

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.