Drying of ultrasound pretreated apple and its selected physical properties

► The effect of ultrasonic treatment before drying of apples were investigated. ► The influence of ultrasound treatment on rehydration properties of dried material was studied. ► The changes in apples microstructure were examined. ► Ultrasound application caused alteration of rehydration properties. ► Ultrasound treatment and subsequently drying induced changes of apple microstructure.