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Physalis pubescens L. is rich in natural pigments but has not yet been fully utilized. Ultrasound-assisted extraction of yellow pigment from Physalis pubescens L. was investigated by response surface methodology in this study. Optimal parameters were ultrasonic power of 29.21%, ultrasonic time of 14.41 min, and ultrasonic interval time of 10.55 s. The yield was 0.193% under optimal parameters. FRAP, ABTS, and superoxide radical scavenging activity of the yellow pigment were 6.11 ± 0.22 mmol/g, 2.80 ± 0.27 mmol/g, and 57281.5 ± 2749.5 U/g, respectively. The results showed that the yield of yellow pigment could be improved by ultrasonic-assisted extraction and the yellow pigment extracted by ultrasound had antioxidant activity.

Ultrasonic-Assisted Extraction of Natural Yellow Pigment from Physalis pubescens L. and Its Antioxidant Activities