COMPARISON OF MICROWAVE AND ULTRASOUND-ASSISTED EXTRACTION FOR LEACHING BETACYANIN FROM DRAGON FRUIT PEELS

Abstract

Extraction of betacyanin from dragon fruit peels by microwave and ultrasound was studied by experimental method. In both microwave and ultrasound-assisted extractions, effects of extraction time (10-110 sec for microwave; 5-25 min for ultrasound) and different powers (200 W, 400 W, 600 W for microwave; 150 W, 187.5 W, 225 W for ultrasound) were investigated. In microwave assisted extraction, the highest betacyanin (0.456 mg/100 g) was obtained in 30 sec and 600 W powers. For ultrasound-assisted extraction, the condition which acquired the highest betacyanin (0.409 mg/100 g) was 10 min and 187.5 W powers. Microwave reduced extraction time by 95% and betacyanin obtained in this method was higher (0.456 mg/100 g) compaired with (0.409 mg/100 g).
Key words: Microwave, ultrasound, betacyanin, dragon fruit peels