Table 1.

Major chemical constituents of Mentha spp. essential oils.

No.	Constituents	RIExp.	RILit.	Relative Area (%)
				M. citrata	M. piperita	M. spicata
1	α-Pinene	939	932	-	0.7	-
2	β-Pinene	979	979	0.9	0.9	-
3	β-Myrcene	991	990	0.6	-	-
4	Carane	1010	1009	-	5.5	0.5
5	Limonene	1027	1027	1.6	5.2	17.9
6	Linalool	1097	1098	45.1	-	-
7	Isopulegol	1141	1145	-	0.7	-
8	Menthone	1149	1151	-	27.5	2.2
9	Isomenthol	1155	1158	-	5.6	-
10	Menthol	1170	1167	-	49.1	8.5
11	α-Terpineol	1191	1191	2.1	-	-
12	Pulegone	1235	1235	-	1.5	-
13	Carvone	1243	1240	-	-	69.0
14	Linalyl acetate	1253	1252	42.9	-	-
15	Neryl acetate	1356	1358	0.5	-	-
16	Geranyl acetate	1380	1379	0.8	-	-
17	Caryophyllene	1419	1417	2.5	3.2	-
18	Caryophyllene oxide	1587	1589	0.5	-	-
	Total			97.5	99.9	98.1