Abstract:
The aim of this research was to determine the condition of pectin extraction from albodo part of pomelo peel by ultrasonic-microwave assisted extraction (UMAE) for maximum pectin yield with response surface methodology using Box-Benhken design. The effects of pH between 1 and 2, sonication time between 5 and 15 min, microwave power between 350 and 650 W. and irradiation time between 1 and 3 min on the yield of pectin was considered. The result showed that the highest yield of pectin was 53.77±0.68% and it was achieved at 1.8 pH, 15 min sonication time, 600 W microwave power and 3 min irradiation time. When pectin yield from UMAE, ultrasound assisted extraction (UAE) and microwave assisted extraction (MAE) was compared, it showed that the yield of pectin from UMAE was higher than the other techniques in the order of UMAE > MAE > UAE. In term of chemical and physical properties, the result showed that galacturonic acid, degree of esterification and viscosity of pomelo peel pectin from UMAE, MAE and UAE were significantly different (p≤0.05).