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A comparison of four assays detecting oxidizing species

Correlated reactivity of Fe(III)-quin2, but not Fe(III)-EDTA, with hydrogen peroxide

  • Part I Free Radical Stress: Interactions with Trace Elements or Vitamins
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Abstract

Quin2, a fluorescent calcium probe, has a low affinity for calcium in comparison to its affinities for transition metal ions. Chelation of ferric ion with quin2 strongly enhanced the formation of oxidizing species in the presence of bolus H2O2 as detected with four assays, electron spin resonance with the spin-trap DMPO, the deoxyribose assay, the DMSO assay, and plasmid DNA strand breakage. In comparison, Fe(III)-EDTA reacted with bolus H2O2 only as detected with electron spin resonance and the deoxyribose assay, but not as detected with the two latter assays. The addition of reductants, like ascorbate or superoxide generated by hypoxanthine/xanthine oxidase, to Fe(III)-EDTA in the presence of H2O2 produced plasmid DNA strand breakage and strong reactivity in both the DMSO and the deoxyribose assays. Our findings suggest that the main oxidizing species produced in Fenton-type reactions is hydroxyl radical. However, the reaction between Fe(III)-EDTA and bolus H2O2 appears to be exceptional and dominated by a nonhydroxyl radical species.

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Authors and Affiliations

  1. Division of Ionizing Radiation and Fallout, National Defense Research Establishment, S-901 82, Umeå, Sweden

    Björn E. Sandström & Micael Granström

  2. Centre de Recherches du Service de Santé des Armées, La Tronche, France

    Hervé Vezin & Pierre Bienvenu

  3. Department of Clinical Chemistry, Umeå University Hospital, Umeå, Sweden

    Stefan L. Marklund

Authors
  1. Björn E. Sandström
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  2. Micael Granström
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  3. Hervé Vezin
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  4. Pierre Bienvenu
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  5. Stefan L. Marklund
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Sandström, B.E., Granström, M., Vezin, H. et al. A comparison of four assays detecting oxidizing species. Biol Trace Elem Res 47, 29–36 (1995). https://doi.org/10.1007/BF02790098

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  • DOI: https://doi.org/10.1007/BF02790098

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