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Ascorbic acid stability in aqueous solutions.

E Meucci, G E Martorana, A Ursitti

    Acta Vitaminologica Et Enzymologica
    |January 1, 1985
    PubMed
    Summary
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    Water purity significantly impacts ascorbic acid and isoascorbic acid stability. Bovine serum albumin reduces vitamin oxidation, while alkaline phosphatase has minimal effect on stability.

    Area of Science:

    • Biochemistry
    • Food Chemistry
    • Physical Chemistry

    Background:

    • Ascorbic acid (vitamin C) and its stereoisomer, isoascorbic acid, are vital antioxidants.
    • The stability of these vitamins is crucial for their efficacy in various applications.
    • Factors influencing vitamin stability, such as water purity and temperature, require thorough investigation.

    Purpose of the Study:

    • To investigate the influence of water purity on the stability of ascorbic acid and isoascorbic acid solutions.
    • To determine the thermodynamic parameters governing the aerobic oxidation of ascorbate at different temperatures.
    • To assess the impact of bovine serum albumin and alkaline phosphatase on vitamin stability.

    Main Methods:

    • Solutions of ascorbic acid and isoascorbic acid were prepared using water of varying purity.

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  • Aerobic oxidation rates were measured at different temperatures.
  • Arrhenius plots were utilized to derive thermodynamic parameters.
  • The effect of bovine serum albumin and alkaline phosphatase on vitamin stability was evaluated.

    • Main Results:

    • Water purity significantly affected the stability of both ascorbic acid and isoascorbic acid.
    • Temperature influenced ascorbate aerobic oxidation, with thermodynamic parameters elucidated via Arrhenius plots.
    • Bovine serum albumin markedly decreased the oxidation rate of both stereoisomers.
    • Alkaline phosphatase did not significantly alter vitamin stability under the tested conditions.

    Conclusions:

    • Water quality is a critical determinant of ascorbic acid and isoascorbic acid stability.
    • Bovine serum albumin acts as a potent stabilizer for these vitamins against oxidation.
    • Alkaline phosphatase interaction does not pose a significant threat to vitamin stability in this context.