The DPPH radical scavenging activity was evaluated by the method of Gorinstein et al. (2011). Initially, fresh peel tissue (3.0 g) from ten fingers withdrawn randomly from each treatment was mixed with 30 mL methanol and then centrifuged at 10,000 × g for 15 min. The supernatant (0.1 mL) was mixed with 2.9 mL of 0.1 mM DPPH that dissolved in methanol. The reaction mixture was incubated for 20 min at 25 °C in the dark. The control containing all reagents without the sample and was used as blank. The DPPH radical scavenging activity was determined by measuring the absorbance at 517 nm using a spectrophotometer. The DPPH radical scavenging activity (%) of the sample was calculated as (1 − absorbance of sample/absorbance of control) × 100.