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Related Experiment Videos

Oxygen-accepting antioxidants which arise during ascorbate oxidation

J C Deutsch1

  • 1Department of Medicine, Divisions of Gastroenterology and Hematology, University of Colorado Health Sciences Center and Denver Veterans' Administration Hospital, 4200 East Ninth Avenue, Denver, Colorado, 80262, USA. deutschj@essex.uchsc.edu

Analytical Biochemistry
|January 12, 1999
PubMed
Summary
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Ascorbate (vitamin C) oxidation was studied at different pH levels. A key antioxidant intermediate, 3,4,5-trihydroxy-2-ketopentanoate, was identified in solutions at physiological pH.

Area of Science:

  • Biochemistry
  • Analytical Chemistry
  • Oxidative Stress Research

Background:

  • Ascorbate (vitamin C) is a crucial antioxidant.
  • Understanding its degradation products and their antioxidant potential is vital.
  • Dehydroascorbate (DHA) is an oxidized form of ascorbate.

Purpose of the Study:

  • To identify potential antioxidant compounds formed during ascorbate and dehydroascorbate oxidation.
  • To investigate the influence of pH on these oxidation processes.
  • To elucidate the role of intermediates in the ascorbate degradation cascade.

Main Methods:

  • Real-time analysis using gas-chromatography electron impact mass spectrometry (GC-EIMS).
  • Real-time analysis using liquid-chromatography electrospray mass spectrometry (LC-ESI-MS).

Related Experiment Videos

  • Comparative studies at pH 3.3 and pH 7.4 under hydrogen peroxide exposure.

    • Main Results:

    • Significant differences in oxidation pathways were observed between pH 3.3 and pH 7.4.
    • At pH 7.4, dehydroascorbate primarily formed diketogulonate.
    • A labile 5-carbon intermediate, 3,4,5-trihydroxy-2-ketopentanoate, was identified and proposed as a key antioxidant species at physiological pH.

    Conclusions:

    • The oxidation of ascorbate and dehydroascorbate is pH-dependent.
    • 3,4,5-trihydroxy-2-ketopentanoate plays a significant role as an antioxidant in the ascorbate degradation cascade at physiological pH.
    • This intermediate may contribute to the overall antioxidant capacity of ascorbate-containing solutions.