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Electron paramagnetic resonance: a new techniquein skin research
Junichi Mizushima1, Yoshiaki Kawasaki, Kazutami Sakamoto
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.
Summary
Electron paramagnetic resonance (EPR) spectroscopy effectively measures skin barrier fluidity. This technique can assess both cadaver stratum corneum and stripped skin, reflecting actual lipid conditions.
Area of Science:
- Biophysics
- Materials Science
- Dermatology
Background:
- Electron paramagnetic resonance (EPR) spectroscopy with nitroxide spin probes is a valuable tool for investigating biological membranes and chemical interactions.
- The stratum corneum's intercellular lipid structure is crucial for skin barrier function.
- Understanding how surfactants affect skin lipids is important for cosmetic and pharmaceutical applications.
Purpose of the Study:
- To investigate the impact of surfactants on the intercellular lipid structure of cadaver stratum corneum.
- To evaluate the feasibility of using EPR spectral measurements on stripped stratum corneum.
- To determine if EPR can accurately reflect actual skin lipid conditions.
Main Methods:
- Utilized nitroxide spin probes for EPR spectral analysis.
- Examined cadaver stratum corneum treated with surfactants.
- Employed cyanoacrylate resin for preparing stripped stratum corneum samples for EPR measurements.
Main Results:
- EPR spectra demonstrated sensitivity to changes in the fluidity of the stratum corneum.
- Successful EPR measurements were achieved on stripped stratum corneum samples.
- The study confirmed the utility of EPR for evaluating skin lipid fluidity.
Conclusions:
- EPR spectroscopy is a reliable method for assessing the fluidity of stratum corneum.
- The technique is applicable to both intact cadaver stratum corneum and stripped skin samples.
- EPR measurements provide insights into the actual lipid conditions of the skin barrier.