Scavenging rate constants of hydrophilic antioxidants against multiple reactive oxygen species

Yoshimi Sueishi, Masashi Hori, Misa Ishikawa, Keiko Matsu-ura, Erisa Kamogawa, Yusaku Honda, Masakazu Kita, Keishi Ohara

Research output: Contribution to journalArticlepeer-review

59 Citations (Scopus)


Scavenging rate constants of eight hydrophilic antioxidants, including caffeic acid, chlorogenic acid, genistein, glutathione, N-acetylcysteine, rutin, trolox, and uric acid against multiple ROS, namely superoxide anion, hydroxyl radical, singlet oxygen, and alkoxyl radical were determined with the electron spin resonance method. Direct flash photolysis measurement of the second-order rate constant in the reaction of alkoxyl radical plus the spin trap 5,5-dimethyl-pyrroline N-oxide made it possible to evaluate scavenging rate constants in antioxidants. The magnitudes of scavenging rate constants were notably dependent on the character of each ROS and the overall rate constants were highest in hydroxyl radical scavenging and the lowest in superoxide anion. The highest scavenging rate constant against superoxide anion was obtained by chlorogenic acid (2.9 × 105 M-1 s-1) and the lowest was by N-acetylcysteine (5.0 × 102 M-1 s1). For singlet oxygen, the highest was by glutathione (9.4 × 108 M-1s-1') and the lowest was by uric acid (2.3 × 106 M-1s-1). All other numbers are listed and illustrated. Redox potential measurements of the anti-oxidants indicated that the antioxidants are likely to react with superoxide anion and singlet oxygen through electron transfer processes.

Original languageEnglish
Pages (from-to)67-74
Number of pages8
Journaljournal of clinical biochemistry and nutrition
Issue number2
Publication statusPublished - Mar 1 2014
Externally publishedYes


  • Hydrophilic antioxidant
  • Radical scavenging
  • Reactive oxygen species (ROS)
  • Redox potential
  • Spin trapping

ASJC Scopus subject areas

  • Medicine (miscellaneous)
  • Nutrition and Dietetics
  • Clinical Biochemistry


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