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Nitroxide radical biostability in skin

J Fuchs1, H J Freisleben, M Podda

  • 1Zentrum der Dermatologie und Venerologie, Abteilung II, Universitätsklinikum, Frankfurt, Germany.

Free Radical Biology & Medicine
|October 1, 1993
PubMed
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Nitroxide radicals used in skin research can lose their paramagnetic properties. Imidazoline and pyrrolidine nitroxides show the highest stability in skin tissues, making them ideal for dermatologic applications.

Area of Science:

  • Dermatology
  • Biophysics
  • Chemistry

Background:

  • Nitroxide radicals are valuable tools in dermatologic research, particularly for electron paramagnetic resonance (EPR) spectroscopy.
  • Loss of paramagnetic properties in biological tissues can limit the application of nitroxides in biomedical research.

Purpose of the Study:

  • To analyze the biostability of various nitroxide radical types within skin.
  • To identify nitroxide structures with enhanced stability for dermatologic applications.

Main Methods:

  • Electron paramagnetic resonance (EPR) spectroscopy was employed to assess nitroxide stability.
  • Biostability was evaluated in keratinocytes, epidermis homogenate, and intact mouse and human skin.

Main Results:

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  • Nitroxide signal loss in skin is primarily due to reduction to hydroxylamines.
  • Stability order in skin tissues: imidazoline > pyrrolidine > di-t-butylnitroxide (DTBN) > piperidine > oxazolidine.
  • Cationic nitroxides exhibited faster reduction rates compared to neutral or anionic probes.

Conclusions:

  • Imidazoline and pyrrolidine nitroxides are recommended for applications requiring high biostability in skin.
  • Piperidine-type nitroxides are suitable probes for investigating one-electron transfer reactions in skin.