Solvent-less Microwave Distillation and Simultaneous Extraction of Essential Oil from Dendranthenma indicum var. aromaticum

In this study, solvent-less microwave distillation and simultaneous extraction approach was used for obtaining of essential oil from leaves of Dendranthenma indicum var. aromaticum. Effects of extractant type and dosage, microwave irradiation time and microwave irradiation power on the yield of essential oil were investigated. The optimum operating conditions were as follows: the liquid-solid ratio was 2∶1 mL·g^–1, microwave irradiation time was 40 min, and microwave irradiation power was 540 W. The chemical composition of the essential oil was analyzed by gas chromatography-mass spectrometry, and the main components were myrtenyl acetate (21.72%) and cis-sabinol (19.23%).