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Chemical models and radiation damage.

M Fitchett, B C Gilbert, M Jeff

    Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
    |December 17, 1985
    PubMed
    Summary
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    Electron spin resonance (ESR) spectroscopy studied the effects of pH and ligands on the iron-catalyzed decomposition of hydrogen peroxide to hydroxyl radicals (OH.). Subsequent reactions of OH. with biomolecules were investigated, focusing on potential radiation damage mechanisms.

    Area of Science:

    • Biochemistry
    • Chemical Kinetics
    • Spectroscopy

    Background:

    • Hydroxyl radicals (OH.) are highly reactive species implicated in cellular damage.
    • Understanding the formation and reactions of OH. is crucial for elucidating biological processes.
    • Metal-catalyzed reactions, particularly involving iron, are significant sources of OH. in biological systems.

    Purpose of the Study:

    • To investigate the metal-catalyzed decomposition of hydrogen peroxide (H2O2) to OH. using ESR spectroscopy.
    • To examine the subsequent reactions of OH. with various biomolecules, including sugars and nucleotides.
    • To elucidate the influence of pH and ligands on the iron-II-H2O2 reaction and OH. attack sites.

    Main Methods:

    • Electron spin resonance (ESR) spectroscopy

    Related Experiment Videos

  • Aqueous flow system for real-time radical detection
  • Investigation of reactions involving Fe(II), H2O2, and biomolecules

    • Main Results:

    • Characterized the Fe(II)-H2O2 reaction, noting the impact of pH and ligand environment.
    • Identified sites of OH. attack on pyranose and furanose sugars, sugar phosphates, nucleosides, and nucleotides.
    • Observed subsequent radical reactions, particularly in the ribofuranose moiety of adenosine, relevant to radiation damage.

    Conclusions:

    • ESR spectroscopy is effective for studying OH. generation and reactions in aqueous systems.
    • The reactivity and biological impact of OH. are modulated by reaction conditions (pH, ligands) and substrate structure.
    • Radical reactions initiated by OH. attack on biomolecules contribute to understanding radiation-induced damage pathways.