The improvement of TMA and TPC extractions from mangosteenhull powder with direct ultrasonic pre-treatment over the indirectmethod of using bath has proven. The advantage of using the probecompared to the bath has also been reported in the extraction ofoleuropein from olive fruit (Jerman et al., 2010). They revealed thatthe optimized ultrasonic probe conditions of the three extractionsteps of 20 min, 44◦C and pure methanol was more efficient incomparison to the ultrasonic bath and agitation, with up to 33%and 80% enhancement in the extraction of oleuropein from olivefruit.