Antioxidant activity of some extracts from gamma irradiated pomegranate (Punica granatum L.) peel and seed [electronic resource].

Includes references.

The present study aims to evaluate the antioxidant activity of pomegranate (Punica granatum L.) peel and seed (obtained as waste from juice extraction) using different solvents as diethyl ether, ethyl acetate, ethanol 50%, ethanol 80%, methanol 50%, methanol 80% and distilled water. The measurements of the antioxidant activity of all extracts were carried out using a radical scavenging activity against 2,2' -diphenyl-1-picrylhydrazyl (DPPH), ?-Carotene/linoleic acid bleaching and ferric reducing antioxidant power (FRAP). Moreover, the effect of gamma irradiation at dose levels of 3, 6 and 9 kGy on antioxidant activity of the best pomegranate peel and seed samples that possessed highest antioxidant activity was investigated. Results showed that ethanolic 50% peel extract had a higher total phenolic contents(TPC) and total flavonoid contents (TFC) in both peel and seed, (9323.17 mg gallic acid equivalent (GAE) 100 g-1, 2998.05 mg quercetin equivalent (QE) 100 g-1 and 352.09 mgGAE100 g-1,106.78 mg QE 100 g-1dry weight (DW), respectively than other extracts. Ethanolic 50% extracts showed higher antioxidant activity than other peel and seed extracts. In addition, ethanolic 50% extract of irradiated pomegranate peel and seed at dose level of 6 kGy extract had higher TPC, TFC and antioxidant activity compared to other doses. Thus, ethanolic 50% extract of irradiated pomegranate peel and seed at 6 kGy may be considered as a good source of natural compounds with antioxidant activity which could be suitable as potential ingredient for food products. Key words: Pomegranate, peel, seed, phenolic compound, antioxidant activity.

Summary in Arabic.

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