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

Table 1

Factors and levels of single-factor experiments.

	Ultrasonic power (%)	Ultrasonic time (min)	Ultrasonic interval time
1	15% (97.5 W)	3	5 s (5 s on, 5 s off)
2	30% (195 W)	6	10 s (10 s on, 10 s off)
3	45% (292.5 W)	9	15 s (15 s on, 15 s off)
4	60% (390 W)	12	—
5	75% (487.5 W)	15	—

Note. Ultrasonic interval time 5 s means that each cycle is 5 s on and 5 s off at corresponding ultrasonic power.