Table 1.

Chemical composition of the essential oils (EOs) tested, expressed as percentage.

Chemical Component	LRI	Aloysia triphylla	Cymbopogon citratus	Cinnamomum zeylanicum	Litsea cubeba	Mentha piperita	Syzygium aromaticum	Mixture
α-Thujene	930	0.2	0.1	0.3
α-Pinene	939					0.8
Sabinene	975	24.0		0.1	1.0	1.8
β-Pinene	979			0.5	1.2			0.2
α-Phellandrene	1003			2.1				0.3
α-Terpinene	1017	0.2		1.0		0.2		0.1
p-Cymene	1025	0.4		3.0	0.2	0.4		0.5
Limonene	1029	36.7	2.0		16.3	3.0
β-Phellandrene	1030			5.9				1.1
1,8-Cineole	1031		0.3		2.3	5.0
γ-Terpinene	1060	0.3			0.1	0.3
Terpinolene	1089	0.1		0.3		0.1
Linalool	1097	3.0	1.5	6.3	1.5	0.4		1.5
Menthone	1153					26.6
Citronellal	1153	12.0	0.5		0.9
Menthofuran	1164					12.5
Menthol	1172					32.4
4-Terpineol	1177	0.7		0.3	0.1			0.1
α-Terpineol	1189	0.4		0.8	0.5	0.3		0.3
Citronellol	1226	1.9
Neral	1238	0.7	35.2		32.5
Geraniol	1253		4.4		0.5
Geranial	1267	1.2	38.4		36.4
(E)-Cinnamaldehyde	1270			56.4				18.5
Menthyl acetate	1295					6.1
Eugenol	1359			3.0			77.9	51.7
β-Caryophyllene	1419	1.3	2.3	10.3	0.8	2.8	8.9	7.6
Germacrene D	1485	0.7	0.2			0.7
Eugenyl acetate	1523						12.2	12.7
δ-Cadinene	1523		0.3	0.2		0.2	0.2	0.9
τ-Cadinol	1640	0.1
Unknown		0.5	0.4	0.3	0.6	0.2		0.1
Total		99.5	99.6	99.7	99.4	99.8	100.0	99.9
Monoterpene Hydrocarbons (MH)		66.0	3.9	15.5	21.3	6.9		2.2
Oxygenated Monoterpenes (OM)		26.4	86.3	7.4	75.7	87.8		1.9
Sesquiterpene Hydrocarbons (SH)		4.7	4.5	14.7	0.9	4.6	9.5	10.1
Oxygenated Sesquiterpenes (OS)		1.9	0.9	0.8		0.3	0.4	1.2
Phenylpropanoides (PP)			2.0	60.3			90.1	64.4
Non-terpenes (NT)		0.5	2.0	1.0	1.5	0.2		20.1

Legend—LRI: Linear retention indices on the DB5 column; Mixture: Cinnamomum zeylanicum and Syzygium aromaticum.