Free-radical scavenging activity of radioprotectors: comparison between clinically used radioprotectors and natural antioxidants


Clinically used radioprotectors, amifostine and cysteamine, have been shown to possess free-radical scavenging activities. Natural antioxidants also possess free-radical scavenging activities, some of which have been shown to have radioprotective capability. We carried out a quantitative determination of the scavenging abilities in amifostine and cysteamine and compared the potencies with natural antioxidants by using multiple free-radical scavenging method. Overall, amifostine and cysteamine showed scavenging activity as potent as natural antioxidants. We found a correlation between scavenging activity and radioprotective efficiency that was previously determined in rat thymocytes. These correlations are indicative that natural antioxidants can be effective radioprotectors.

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We thank Dr. Yashige Kotake for helpful discussion and critical reading of the manuscript.

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Correspondence to Yoshimi Sueishi.

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Sueishi, Y., Fujii, T. & Nii, R. Free-radical scavenging activity of radioprotectors: comparison between clinically used radioprotectors and natural antioxidants. J Radioanal Nucl Chem 325, 695–700 (2020).

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  • Natural antioxidant
  • Antioxidant ability
  • Radioprotective effect
  • ESR spin trapping