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标题：Scavenging rate constants of hydrophilic antioxidants against multiple reactive oxygen species
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作者：Yoshimi Sueishi ; Masashi Hori ; Misa Ishikawa 等
期刊名称：Journal of Clinical Biochemistry and Nutrition
印刷版ISSN：0912-0009
电子版ISSN：1880-5086
出版年度：2014
卷号：54
期号：2
页码：67-74
DOI：10.3164/jcbn.13-53
出版社：The Society for Free Radical Research Japan
摘要：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 s⁻¹). For singlet oxygen, the highest was by glutathione (9.4 × 10⁸ M⁻¹ s⁻¹) and the lowest was by uric acid (2.3 × 10⁶ M⁻¹ s⁻¹). All other numbers are listed and illustrated. Redox potential measurements of the antioxidants indicated that the antioxidants are likely to react with superoxide anion and singlet oxygen through electron transfer processes.
关键词：reactive oxygen species (ROS);hydrophilic antioxidant;radical scavenging;spin trapping;redox potential