Table 2.

GC-MS analysis of wild O. syriacum leaves EO samples from The West Bank/Palestinian Authority.

No	Compound†	Molecular Formula	Molecular Weight	Retention Time	RI††	Relative Content (%) of EOs
						Q*	J*	T*	B*
1	α-Thujenea	C10H16	136	5.893	930	1.04	0.74	1.35	2.86
2	α- Pinenea	C10H16	136	6.115	939	1.37	1.35	1.15	2.00
3	β-Pinenea	C10H16	136	7.740	979	2.57	2.11	1.18	2.16
4	1-Phellandrenea	C10H16	136	8.352	1003	0.68	0.55	0.31	0.60
5	α-Terpinenea	C10H16	136	8.718	1017	12.97	27.95	21.97	36.80
6	tert-Butyl benzenee	C10H14	134	9.225	–	1.36	0.97	0.68	1.27
7	γ-Terpinenea	C10H16	136	10.237	1060	3.05	21.14	6.70	10.51
8	α-Terpinolenea	C10H16	136	11.290	1086	0.47	0.93	0.75	0.94
9	4-Terpineolb	C10H18O	154	15.281	1177	2.10	0.99	0.62	0.83
10	Thymoquinoneb	C10H12O2	164	18.274	1252	2.17	1.28	1.24	2.10
11	Thymolb	C10H14O	150	20.104	1290	19.99	11.74	39.87	5.90
12	Carvacrolb	C10H14O	150	20.461	1299	18.99	13.64	15.44	21.40
13	Caryophyllenec	C15H24	204	25.382	1419	12.89	6.38	1.93	2.20
14	α-Amorphenec	C15H24	150	28.130	1483	0.64	0.37	0.21	–
15	delta-Cadinenec	C15H24	204	29.389	1522	–	0.39	–	–
16	Caryophyllene oxided	C15H24O	220	31.861	1583	2.19	0.92	0.43	0.50
17	Octahydro-tetramethyl- phenanthrenee	C18H26	242	43.799	–	0.82	0.37	0.45	0.51
Identified Phytochemical Groups
Monoterpene hydrocarbonsa						22.15	54.77	33.41	55.87
Oxygenated monoterpenesb						43.25	27.65	57.17	30.23
Sesquiterpene hydrocarbonsc						13.53	7.14	2.11	2.20
Oxygenated sesquiterpenesd						2.19	0.92	0.43	0.50
Non terpene hydrocarbonse						2.18	1.34	1.13	1.78
Total of phytochemical groups						83.3	91.82	94.28	90.58

Q*: Qalqilya, J*: Jerusalem, T*: Tulkarem, B*: Bethlehem.

^†Compounds are listed based on their elution order identified according to WILEY, NIST and ADAMS-2007 libraries.

^a = Monoterpene.

^b = Oxygynated monoterpene.

^c = Sesquiterpene.

^d = Oxygenated sesquiterpene.

^e = Non terpene hydrocarbons.

^††RI: (Retention Indices) linear (arithmetic) retention index calculated on a DB-5 equivalent column.