Abstract
ABSTRACTThe antiradical and antioxidant properties of pomegranate (Punica granatum L.) extracts from the arils, juice, and seeds were examined and compared for classical and ultrasound-assisted extraction. The total phenolic concentration, 2,2-diphenyl-1-picryl-hydrazyl, 2,2′-azino-bis-(3-ethylbenzothiazoline-6-sulfonic acid) radical scavenging, and ferric reducing antioxidant power assays were compared. High correlations were found between total phenolic concentration and antiradical activities. Juice extracts exhibited the highest total phenolic concentrations and antiradical activity compared to seed and aril extracts. However, juice extracts provided the lowest antioxidant capacities because phenolics present in juice may scavenge free radicals rather than reduce Fe(III). Arils were similar due to their high juice content. Only seed extracts exhibited statistically significant higher scavenging and antioxidant activities with the use of ultrasound-assisted extraction that may be attributed to the antioxidant character of the phenolics to scavenge free radicals. The total phenolic concentrations in aril and juice extracts by ultrasound-assisted extraction were similar to results obtained by classical extraction. The results show that pomegranate juice and seeds have high nutritional value.
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