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This study aimed to determine the antioxidant activity of red onion peel extract using ultrasound extraction. Antioxidant activity was evaluated using DPPH, inhibition of β-carotene, ABTS and FRAP. The results indicated that the 130 W ultrasound power, in pulsed mode, and with 60% solvent favored flavonoids and total anthocyanins, FRAP and  β- carotene. The highest levels of total phenolics were found using 60% solvent, at 130 W, and in continuous extraction mode. DPPH was influenced only by the 60% solvent, and the ABTS values were higher with the 80% solvent, in pulsed mode, and at 130 W of power.

Ultrasonic _assisted extraction of phenolic compounds with evaluation of red onion skin (Allium cepa L.) antioxidant capacity