Table 1.

Citral content of different plant species and their extraction methods.

Essential Oil	Plant Material	Citral Content	Collection Site	Extraction Method	Ref.
Cymbopogon citratus	Entire plant	48.92%	India	Steam distillation	[28]
	Entire plant	62%	Vietnam	Steam distillation under vacuum	[5]
	Aerial part	74%	-	Solvent-free microwave extraction	[29]
	Dried leaves	80.93%	Brazil	Hydrodistillation	[30]
	Fresh leaves	72.6	South Africa	Hydrodistillation	[31]
Cymbopogon flexuosus	Entire plant	43.1%	India	Hydrodistillation	[32]
	Entire plant	74.98%	India	Steam distillation	[28]
Cymbopogon citrus	Dried leaves	66.53% and 60.78%	Taiwan	Solar energy extraction and hydrodistillation	[33]
Lippia alba	Dried leaves	69%	Brazil	Hydrodistillation	[34]
Pectis brevipedunculata	Aerial parts	>91%	Brazil	Hydrodistillation and solid phase microextraction	[35]
Pectis elongata	Dried aerial parts	90%	Brazil	Hydrodistillation	[36]
Citrus limon var. pompia	Fresh leaves	17.9%	Italy	Steam distillation	[37]
Lippa citriodora Kunth	Dried leaves	59.2%	Iran	Hydrodistillation	[38]