Table 1.

GC-MS chemical composition (%) of the essential oil from P. racemosa grown in egypt.

No.	Compound name a	Retention time (tR)	Molecular formula	RI		Peak area (%)	Method of identification	Ref.
				Experimental	Reported
1.	α-Pinene	7.17	C10H16	931	932	0.32	RI, MS	18,54
2.	β -Myrcene	8.94	C 10 H 16	992	992	12.88	RI, MS	4,45
3.	α-Phellandrene	9.29	C10H16	1003	1005	0.54	RI, MS	40,43
4.	p-Cymene	9.92	C10H14	1024	1026	1.12	RI, MS	46
5.	D-Limonene	10.06	C 10 H 16	1028	1029	8.35	RI, MS	18
6.	(E)-β-Ocimene	10.68	C10H16	1048	1050	0.20	RI, MS	41
7.	β-Linalool	12.28	C10H18O	1100	1100	2.14	RI, MS	18
8.	Terpinen-4-ol	14.67	C10H18O	1178	1177	0.19	RI, MS	45
9.	Chavicol	17.05	C9H10O	1258	1259	1.48	RI, MS	18
10.	Eugenol	20.08	C 10 H 12 O 2	1366	1365	70.87	RI, MS	51
11.	α-Copaene	20.46	C15H24	1379	1376	0.13	RI, MS	11
12.	(E)-β-Caryophyllene	21.65	C15H24	1423	1423	0.28	RI, MS	51
13.	α-Murolene	23.13	C15H24	1480	1481	0.15	RI, MS	45
14.	3-Cyclohexene-1-carboxaldehyde, 4-(4-methyl-3-pentenyl)-	24.20	C13H20O	1509	1522	0.29	RI, MS	41,46
15.	δ-Cadinene	24.33	C15H24	1527	1530	0.50	RI, MS	30
16.	(E)-β-Caryophyllene oxide	25.88	C15H24O	1590	1590	0.16	RI, MS	18
17.	τ-Cadinol	27.27	C15H26O	1648	1648	0.16	RI, MS	41
	Total identified	99.76%
	Phenylpropanoids	72.35%
	Hydrocarbon monoterpenes	23.41%
	Oxygenated monoterpenes	2.33%
	Hydrocarbon sesquiterpenes	1.06%
	Oxygenated sesquiterpenes	0.32%
	Others	0.29

^a Compounds are arranged according to their elution. RI: Kovats retention index on TG-5MS capillary column. MS, identification based on mass spectral data and fragmentation profile.