2.4. Antioxidant activities of the white tea extract (WTE)
2.4.1. Ferric reducing antioxidant power
The FRAP assay measures the reducing potential of antioxidants by reaction with the ferric tripyridyltriazine (Fe3+–TPTZ) complex,producing a blue colour from the ferrous form that can be detected by absorbance at 593 nm. Antioxidant compounds that act as reducing agents exert their effect by donating a hydrogen atom to the ferric complex, thus breaking the radical chain reaction.