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Related Experiment Videos

The aqueous reference for ESR oximetry.

Galina Diakova1, Robert G Bryant

  • 1Chemistry Department, University of Virginia, Charlottesville, VA 22901, USA.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|November 1, 2005
PubMed
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Molecular oxygen interactions with nitroxide spin labels depend on the solvent. In aqueous solutions, the hydrophobic effect concentrates oxygen around nitroxides, potentially affecting electron spin resonance (ESR) oximetry measurements.

Area of Science:

  • Biophysical Chemistry
  • Spin Labeling Techniques
  • Molecular Spectroscopy

Background:

  • Nitroxide spin labels are widely used in Electron Paramagnetic Resonance (EPR) spectroscopy.
  • Understanding molecular oxygen's interaction with these labels is crucial for accurate EPR oximetry.
  • Solvent effects on oxygen concentration near spin labels are not fully characterized.

Purpose of the Study:

  • To investigate the influence of solvent polarity on molecular oxygen interactions with nitroxide derivatives.
  • To quantify the local oxygen concentration around nitroxide spin labels in different solvent environments.
  • To assess the implications of these findings for nitroxide-based EPR oximetry.

Main Methods:

  • Utilized nuclear spin-relaxation spectroscopy to study proton spin-lattice relaxation rates.

Related Experiment Videos

  • Investigated nitroxide derivatives in both aqueous and nonaqueous (octane) solvents.
  • Correlated relaxation rates with local oxygen concentrations.

    • Main Results:

    • Local oxygen concentration near nitroxide spin labels is solvent-dependent.
    • In aqueous solutions, the hydrophobic effect significantly increases local oxygen concentration in nonpolar regions of solutes.
    • Reduced nitroxides in water showed approximately double the local oxygen concentration compared to the free diffusion limit, an effect absent in octane.

    Conclusions:

    • Solvent-mediated hydrophobic effects alter local oxygen concentrations around nitroxide spin labels.
    • Nitroxide-based EPR oximetry may require adjustments for aqueous measurements due to these concentration shifts.
    • A potential reference concentration shift of up to a factor of two exists if aqueous nitroxide data is used as a universal reference.