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Table 2 Reactive species scavenged by ascorbic acid

From: Vitamin C in human health and disease is still a mystery? An overview

Chemical species Reaction rate (M-1s-1)
Reactive oxygen species  
Hydroxyl radical 1.1 × 1010
Alkoxyl radical 1.6 × 109
Peroxy radical 1.2 × 106
Superoxide anion/ hydroperoxy radical 1.0 × 105
Reactive nitrogen species  
Dinitrogen trioxide/dinitrogen tetroxide 1.2 × 109
Peroxynitrite/peroxynitrous acid 235
Antioxidant derived radicals  
Alpha-tocopherol radical 2 × 105
Urate radical 1 × 106
Thiyl/sulphenyl radical 6 × 108
  1. Adapted from Carr and Frei [15]