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Ascorbic acid oxidation in sucrose aqueous model systems at subzero temperatures.

Dominique Champion1, Denise Simatos, Eleni P Kalogianni

  • 1Laboratoire d'Ingénierie Moléculaire et Sensorielle de l'Aliment, ENSBANA, Université de Bourgogne, 21000 Dijon, France. dominique.champion@u-bourgogne.fr

Journal of Agricultural and Food Chemistry
|May 27, 2004
PubMed
Summary

The reaction rate between Tempol and ascorbic acid in sucrose solutions was measured using electron paramagnetic resonance (EPR). Experimental results, influenced by temperature and viscosity, were lower than predicted for diffusion-controlled reactions.

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Area of Science:

  • Chemical kinetics
  • Physical chemistry
  • Biophysical chemistry

Background:

  • The reaction between Tempol and ascorbic acid is a model system for studying diffusion-controlled reactions.
  • Understanding reaction kinetics in viscous media is crucial for various chemical and biological processes.

Purpose of the Study:

  • To measure the rate constants of Tempol reduction by ascorbic acid in concentrated sucrose solutions.
  • To compare experimental findings with theoretical predictions for diffusion-controlled reactions.
  • To investigate the influence of temperature and viscosity on reaction rates.

Main Methods:

  • Electron paramagnetic resonance (EPR) spectroscopy was employed to monitor Tempol reduction over time.
  • Experiments were conducted in concentrated sucrose solutions at temperatures ranging from 16 to -16 degrees C.

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  • Reaction rate constants were determined and compared with predictions from Atkins' equation for diffusion-controlled reactions.

    • Main Results:

    • Experimental reaction rate constants were found to be lower than theoretically predicted values.
    • The observed reaction rates were dependent on temperature and viscosity changes in the sucrose solutions.
    • Findings are consistent with a diffusion-controlled reaction mechanism.

    Conclusions:

    • The reduction of Tempol by ascorbic acid in sucrose solutions is a diffusion-controlled process.
    • Temperature and viscosity significantly impact the kinetics of this reaction.
    • EPR spectroscopy is a suitable method for studying fast reactions in viscous media.