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Factors influencing ascorbate free radical formation.

R Sasaki, T Kurokawa, D Shibuya

    Biochemistry International
    |February 1, 1985
    PubMed
    Summary

    Serum components like ceruloplasmin and albumin influence ascorbate oxidation, affecting ascorbate radical levels. A complex balance of factors in serum determines the overall redox state and radical intensity.

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    Area of Science:

    • Biochemistry
    • Oxidative Stress Research

    Background:

    • Ascorbate (vitamin C) plays a crucial role in biological systems.
    • Understanding ascorbate's redox behavior in serum is vital for comprehending its physiological functions and potential pathologies.

    Purpose of the Study:

    • To identify serum constituents that influence the formation and stability of the ascorbate radical.
    • To elucidate the complex interplay of factors governing ascorbate redox processes in biological fluids.

    Main Methods:

    • Assessing the catalytic and inhibitory effects of purified serum proteins (ceruloplasmin, albumin, fibrinogen, fetuin, transferrin) on ascorbate oxidation.
    • Measuring Electron Spin Resonance (ESR) intensity to quantify ascorbate radical formation.
    • Analyzing serum fractions to identify novel factors affecting ascorbate redox state.

    Main Results:

    • Human ceruloplasmin and albumin individually catalyzed ascorbate oxidation, increasing ESR signal.
    • Combined ceruloplasmin and albumin showed synergistic catalysis but paradoxically decreased radical intensity.
    • Fibrinogen and fetuin inhibited ascorbate oxidation, while transferrin and citric acid had no significant effect.
    • A novel inhibitory factor for ascorbate oxidation was identified in a serum fraction.

    Conclusions:

    • Serum exhibits a counterbalanced equilibrium in ascorbate's redox process.
    • Ascorbate radical intensity is modulated by a summation of complex, often opposing, effects from various serum factors.

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