Antinociceptive Effect of the Essential Oil Obtained from the Leaves of Croton cordiifolius Baill. (Euphorbiaceae) in Mice

Table 2

Chemical composition of the essential oil of Croton cordiifolius Baill. leaves.

Volatile constituent^a	RI^b	RI^c	Retention time (min)	Relative area %
Monoterpenes
α-Pinene	939	937	13.88	4.96
β-Phellandrene	964	974	16.15	4.68
α-Phellandrene	1003	1005	18.01	15.43
β-Cymene	1025	1024	19.21	8.02
D-Limonene	1030	1029	19.51	5.22
Oxygenated monoterpenes
1,8-Cineol	1031	1032	19.73	25.09
β-Linalool	1097	1097	23.67	2.34
α-Terpineol	1189	1192	29.53	3.41
Sesquiterpenes
β-Caryophyllene	1419	1418	43.41	6.58
γ-Elemene	1430	1484	47.49	7.36
Oxygenated sesquiterpenes
Spathulenol	1578	1518	49.55	6.68
β-Caryophyllene oxide	1583	1520	49.69	4.72
Cadinol	1640	1534	50.59	5.51
Total				100.0

^aConstituents listed in order of elution on DB-5 column.
^bRI = Kovats retention index according to n-alkanes (C8–C26).
^cRI = Kovats retention index simulated by equation IK = 16.267RT + 711.48.