Some scientists have reported that power ultrasound is extremely effective in the immersion freezing process for fruits and vegetables. Li and Sun reported that the freezing rate was improved greatly when ultrasound power (15.85 W) was applied
for 2 min during immersion freezing of potatoes. Sun and Li investigated the microstructural change of potato tissues and showed that the plant tissue exhibited better cellular structure with less intercellular void and cell disruption under ultrasonic power of 15.85 W during immersion freezing.