Wheat gluten was hydrolyzed by Alcalase 2.4L under ultrasound. Different antioxidant assays in vitro were employed to evaluate the antioxidant activities of the wheat gluten hydrolysate (WGH) obtained. The best ultrasonic parameters were the maximum ultrasonic power (400w) and low-frequency (25kHz) under the conditions of hydrolysis 30min. Under optimal conditions (temperature 50℃, pH9.0), WGHL (WGH which was obtained by low frequency ultrasound) exhibited the strongest antioxidant activities, with an IC50 ...