Antioxidant activity of red onion (Allium cepa L.) peel extract produced by maceration, ultrasonic assisted and supercritical extraction techniques

Red onion (Allium cepa L.) peel were extracted by maceration, ultrasonic assisted and supercritical CO2 extraction and their antioxidant activities were determined usingDPPH free radical scavenging and β-caroten:linoleate bleaching assay. Flavonoid (496.14 mg QE/gE) and phenolic content (371.62mg GA/gE) of UAE were highest whencompared to other extracts. The onion peel extract by ultrasound assisted extraction showed greatest DPPH radical scavenging activities and greatest antioxidant activitiesdetermined by β-caroten:linoleate bleaching assay than maceration or supercritical CO2 extracts. These results demonstrated that the onion peel extracts produced by ultrasound assisted extraction technique have great potential as source for useful antioxidant

کلیدواژه ها:

antioxidant activity ، extraction techniques ، onion peel