TY - JOUR
T1 - Scavenging rate constants of hydrophilic antioxidants against multiple reactive oxygen species
AU - Sueishi, Yoshimi
AU - Hori, Masashi
AU - Ishikawa, Misa
AU - Matsu-ura, Keiko
AU - Kamogawa, Erisa
AU - Honda, Yusaku
AU - Kita, Masakazu
AU - Ohara, Keishi
N1 - Copyright:
Copyright 2014 Elsevier B.V., All rights reserved.
PY - 2014/3/1
Y1 - 2014/3/1
N2 - 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.
AB - 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.
KW - Hydrophilic antioxidant
KW - Radical scavenging
KW - Reactive oxygen species (ROS)
KW - Redox potential
KW - Spin trapping
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U2 - 10.3164/jcbn.13-53
DO - 10.3164/jcbn.13-53
M3 - Article
AN - SCOPUS:84897520825
VL - 54
SP - 67
EP - 74
JO - Journal of Clinical Biochemistry and Nutrition
JF - Journal of Clinical Biochemistry and Nutrition
SN - 0912-0009
IS - 2
ER -