Table 1.

O. syriacum EOs yield obtained by conventional and microwave ultrasonic assisted hydrodistillation.

Origin	Yield (% V/W)		Reference
	HD	MUAHD
Palestine	1.1 – 1.3	1.7–3.3*	(Khoury et al., 2016)
Jordan	0.6–1.6	NA	(Afifi et al., 2017)
Lebanon	1.3 – 4.4	NA	(Awada et al., 2012)
Turkey	0.8–3.5	NA	(Toncer et al., 2010)
Iran	0.9–1.7	NA	(Pirigharnaei et al., 2011)
Morocco	0.8.2–2.61	NA	(Fadel et al., 2010, Aboukhalid et al., 2017)

HD: Hydrodistillation.

MUAHD: Microwave Ultrasonic Assisted Hydrodistillation.

^*: Current study.