In the current study, ultrasound-assisted vacuum extraction (UAVE) was applied to improve the efficiency of hydrodistillation extraction (HDE) and vacuum hydrodistillation extraction (VHE) and produce Kumquat peel essential oil (EO) with acceptable quality. To achieve these objectives, the effects of ultrasound power (210-300 W), ultrasound time (15-40 min), and pressure (600-900 mbar) were evaluated. Resultsshowed that the EO yield initially increased and then decreased with increasing ultrasound power, ultrasound time, and pressure, and the highest EO yield was achieved at 270 W, 20 min, and 800 mbar. The EO obtained by UAVE under conditions allowed How to cite this article:

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