3.5.3. The reducing power of KOG
The antioxidant activity has been reported to have a direct, positive correlation with the reducing power (Yuan et al., 2006). Fig. 3E and F showed the reducing powers of KOG (E) and Vc (F) using the potassium ferricyanide reduction method.
The reductive potential of the KOG and Vc increased with increasing concentration.
Vc showed a relatively high inhibitory effect compared to KOG at low concentration.
At a concentration of 2.0 mg/mL, the absorbance of KOG was 0.17. Sun et al. (2008) found that the absorbance of chitosan oligosaccharide (COS) was 1.29 at the same concentration.
A direct correlation between antioxidant activities and reducing power of certain plant extracts has been reported.
The reducing power properties are generally associated with the presence of reductones, which have been shown to exert antioxidant action by breaking the free radicals’ chain by donating a hydrogen atom (Yuanet al., 2006; Sun et al., 2008).
This result may be related to the fact that molecules with different electron-donating groups affected the activity of electron-donating, which led to the different reducing power.