Among the reactive oxygen species, the hydroxyl radical is the most reactive and induces severe damage to adjacent biomolecules (Yuan et al., 2005).
The scavenging effects of samples on hydroxyl radicals were shownin Fig. 3A and B.
Scavenging activity of hydroxyl radical increased with the increasing of concentrations of KOG (A) and Vc (B).
Scavenging effect on hydroxyl radical of KOG was between 40.0% and 60.0% at 6.0 mg/mL, but the effect on hydroxyl radical of Vc was between 40.0% and 60.0% at 0.4 mg/mL, KOG showed certain effects on scavenging the hydroxyl radicals, but lower than that of Vc.
For hydroxyl radical, there are two types of antioxidation mechanism: one suppresses the generation of the hydroxyl radical and the other scavenges the hydroxyl radicals generated (Qi et al.,2005). In this study, in another assay system, KOG can scavenge the hydroxyl radicals because of the reducing hemiacetal hydroxylin the chains, which can make highly oxidizing free radicals reducted.