GC/MS Evaluation and In Vitro Antioxidant Activity of Essential Oil and Solvent Extracts of an Endemic Plant Used as Folk Remedy in Turkey: Phlomis bourgaei Boiss.

Table 1

Chemical composition of the essential oil of aerial parts of Phlomis bourgaei.

Number	RI^a	RT	Components	(%)	Identification methods
1	938	10.02	𝛼-Pinene	5.65	GC, MS, RI
2	1037	14.52	Limonene	8.97	GC, MS, RI
3	1100	18.14	Perillene	1.93	MS, RI
4	1340	29.28	𝛼-Cubebene	7.43	GC, MS, RI
5	1373	30.61	𝛼-Copaene	2.19	GC, MS, RI
6	1383	30.97	𝛽-Bourbonene	tr	GC, MS, RI
7	1387	31.17	Isolongifolene	1.80	GC, MS, RI
8	1419	32.57	𝛽-Caryophyllene	37.37	GC, MS, RI
9	1453	33.83	(Z)-𝛽-Farnesene	15.88	GC, MS, RI
10	1460	34.12	𝛼-Humulene	0.86	GC, MS, RI
11	1486	36.21	Germacrene D	10.97	GC, MS, RI
12	1494	35.61	𝛿-Selinene	1.51	MS, RI
13	1517	36.70	𝛿-Cadinene	1.19	GC, MS, RI
Grouped components					(%)
Monoterpene hydrocarbons					14.62
Oxygenated monoterpenes					1.93
Sesquiterpene hydrocarbons					79.20
Oxygenated sesquiterpenes					—
Others					—
Total					95.75

aRetention index (RI) relative to n-alkanes on SGE-BPX5 capillary column.
RT: retention time (minute); GC: coinjection with standards; MS: tentatively identified based on computer matching of the mass spectra of peaks with Wiley 7N and TRLIB libraries and published data [14]; RI: identification based on comparison of retention index with those of published data [14]; tr: traces (less than 0.1%).