2.3.1.2. Ultrasound assisted extraction (UAE). Five grams of C. sinensis peel powder were extracted with 50 ml of 80% ethanol in the ultrasound sonicator (VibraCell 75115, Bioblock-Fisher,Illkirch, France) with maximum input power of 200 W. Extrac-tion was carried out for 30 min at 35◦C. The ultrasonic power levels used were 100, 125, 150 and 200 W. The mixture was shaken in darkness and was stirred at the same time using a magnetic stirrer.