Investigation on the influence of ultrasonic pretreatment on color, quality and antioxidant attributes of microwave dried Inula viscosa (L.)

•Samples dried at 100 and 180 W had higher chlorophyll and carotenoid levels than samples dried at 300 W.•A positive correlation was found between color and overall acceptability (r = 0.77)•The lower DPPH of the Inula viscosa L. extracts obtained when the ultrasound pretreatment time was lower than 20 min.•Inula viscosa L. leaves subjected to 10 and 20 min of ultrasound had slightly higher L* values than those exposed to 30 min of sonication.