Table 1.

Chemical composition, concentrations (%), and calculated retention indices of R. chalepensis essential oils as characterized by GC-MS analysis.

Compound	% of total essential oil from Hebron	% of total essential oil from Jerusalem	% of total essential oil from Jenin	The mean of calculated retention Index (Kovats)
Linalyl acetate	29.51	34.21	—	1259
β-Linalool	26.79	31.78	—	1103
2-Undecanone	14.99	7.66	44.31	1297
2-Nonanone	14.29	8.15	43.02	1093
α-Terpineol	3.78	4.17	—	1197
Camphor	1.58	1.82	0.47	1149
Isocaryophyllene	1.58	1.72	—	1404
1,8-Cineole	1.52	1.84	0.84	1033
L-4-Terpineol	0.7	0.96	—	1184
Limonene	0.62	1.18	—	1030
Isoborneol	0.57	0.66	—	1172
3-Octanone	0.3	0.64	—	988
1-Octen-3-ol	0.27	0.39	—	982
1-Heptanol	0.25	0.14	0.53	973
n-Hexyl acetate	—	0.66	—	1013
Alpha cis-Ocimene	—	0.18	—	1039
3-Octanol	—	0.14	—	997
2-Nonanol	—	—	1.4	1102
2-Decanone	—	—	2.01	1196
Total identified components (%)	96.75	96.3	92.58
Grouped components
Hydrocarbons	2.2	2.9
Alcohols	32.36	38.24	1.93
Ketones	31.16	18.27	89.81
Esters	29.51	35.05
Oxide	1.52	1.84	0.84
Total identified chemical classes (%)	96.75	96.3	92.58