The enzymatic oxidation of Desferal to a nitroxide free radical
- 5 October 1987
- journal article
- Published by Wiley in FEBS Letters
- Vol. 222 (2) , 246-250
- https://doi.org/10.1016/0014-5793(87)80379-4
Abstract
Desferrioxamine mesylate (Desferal), a transition metal ion chelator, has been used to inhibit the in vitro redox cycling of transition metal ions. ESR spectroscopy was utilized to detect and identify Desferal's one-electron oxidation product. We demonstrate that a horseradish peroxidase/H2O2 system, a xanthine oxidase/hypoxanthine system, and a hydroxyl radical-generating system are all capable of oxidizing Desferal to a nitroxide free radical. The same 9-line ESR spectrum (g = 2.0065, a N = 7.85 G, a H(2) = 6.35 G) was detected in all of the above systems. We, therefore, stress that care must be taken when using Desferal as a transition metal ion chelator to keep its concentration low enough to minimize these reactions, or to use a different metal ion chelator.Keywords
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