The extraction yields of anthocyanins (TMA) and total phenolics (TPC) from mangosteen hull were optimized
by varying the amplitude and time of ultrasonic treatment. The highest TMA recovery of 2.92 mg
cy-3-glu/g hull powder was achieved using methanol aqueous solvent when direct ultrasonic treatment
was applied for 15 min at 20% amplitude. For the TPC, 245.78 mg GAE/g hull powder was obtained in
ethanol with sonication time of 25 min and at 80% amplitude. These TMA and TPC yields obtained are
respectively 45.6% and 8.8% higher (p < 0.05) when compared to those without ultrasonic treatment. The
ultrasonic treatment is able to improve anthocyanin extraction more effectively than the total phenolics
from mangosteen hull.