An exchangeable tip probe was used. The probe (vibrating titanium
tip of 19 mm in diameter) was attached to the transducer,
and it was immersed in a suspension that was irradiated with an
ultrasonic wave directly from the horn tip. The ultrasound application
time was 1 h with pulsations in the range of 1 min. The ultrasound
power was 24W with 40% amplitude at a frequency of
20 kHz. After application of the ultrasound, the suspension was
then centrifuged at 7000 RPM for 30 min. The supernatant was
discarded, and the decanted starch was dried according