Power Ultrasound for the Improvement of Juices & Smoothies Researches from the Technical University Berlin found that ultrasonication is a very effective processing method to improve fruit and vegetable juices as well as smoothies. Being a non-thermal food process technique, ultrasound provides a mild but effective treatment that intensifies flavours, and stabilizes and preserves juices and purees. The results of ultrasonic juice treatments include improved flavours, stabilization and preservation.