Investigation of the antioxidant properties of metanolic peel extract of pomegranate (Punica granatum var. Rabbab)

Plants are riched by phenolic compounds and considered as the main natural antioxidants. Many efforts have been recently made to clarify the source of natural antioxidants and their roles to protect from oxidative stress injuries. The present study was aimed to qualify the phenolic compounds of pomegranate peel extract (PPE) of Rabbab variety and their antioxidant effect to substitute the synthetic compounds. Folin- Ciocalteu method was employed to investigate phenolic compound, while, spectrophotometery is used to measure flavonoid, antocyanin and oxidative ability. The antioxidant activity of different concentration of PPE was measured using DPPH. Results showed the concentrations of 70.83 mg TAE/g, 21.33 mg CE/g and 136.66 mmol/100 mL corresponding to the phenolic, flavonoid and antocyanin compounds, respectively. The antioxidant effect by linoleic system has shown to inhibit 89.61% of linoleic oxidation in the methanolic extract of PPE. Increasing the concentration of phenolic compound was simultaneous to raise its effect and a significant correlation between the antiradical activity and its reduction ability in the methanolic extract. The current results revealed the antioxidant activity of methanolic extract of Rabbab variety PPE and thus are recommended to apply in food industries.