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Ascorbic acid oxidation by hydrogen peroxide

J C Deutsch1

  • 1Department of Medicine, University of Colorado Health Sciences Center, Denver, USA. deutschj@essex.uchsc.edu

Analytical Biochemistry
|February 4, 1998
PubMed
Summary
This summary is machine-generated.

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Ascorbic acid (vitamin C) degradation by hydrogen peroxide yields threonic acid. Diketogulonic acid, a key intermediate, may be a more potent antioxidant than vitamin C itself.

Area of Science:

  • Biochemistry
  • Oxidative Stress Research

Background:

  • Ascorbic acid (vitamin C) is a vital antioxidant.
  • Its degradation pathways, especially under oxidative stress from hydrogen peroxide, are not fully understood.
  • Identifying intermediates and their properties is crucial for understanding its biological role.

Purpose of the Study:

  • To elucidate the oxidative degradation pathways of ascorbic acid by hydrogen peroxide.
  • To identify the initial products and intermediates formed during this oxidation.
  • To compare the antioxidant potential of intermediates with ascorbic acid.

Main Methods:

  • Oxidation of ascorbic acid and dehydroascorbic acid using hydrogen peroxide.
  • Mass spectral analysis to identify degradation products and intermediates.

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  • Comparative analysis of redox properties of key compounds.

    • Main Results:

    • Ascorbic acid and dehydroascorbic acid are ultimately oxidized to threonic acid by hydrogen peroxide.
    • Key six-carbon intermediates, including tetrahydroxydiketohexanoic acid and diketogulonic acid, were identified.
    • Diketogulonic acid is more susceptible to oxidation than ascorbic acid and acts as an oxygen sink.

    Conclusions:

    • Ascorbic acid oxidation by hydrogen peroxide proceeds through distinct six-carbon intermediates.
    • Diketogulonic acid exhibits significant antioxidant properties, potentially exceeding those of ascorbic acid.
    • Diketogulonic acid may play a critical role as an antioxidant in biological systems containing ascorbic acid.