. 2020 Mar 1;25(5):1101. doi: 10.3390/molecules25051101

Table 2.

Chemical compositions of O. vulgare oils. Their percentage composition and their Kovat Index (KI) values listed in order of elution.

¹ RT (min)	² KI	³ LKI	⁴ MW	Formula	Chemical	Amount (%)
¹ RT (min)	² KI	³ LKI	⁴ MW	Formula	Chemical	⁵ HO	⁶ CO
4.9	924	924 ^a	136	C₁₀H₁₆	Thujene	-	0.7
5.1	930	936 ^b	136	C₁₀H₁₆	α-Pinene	-	1.2
6.8	991	991 ^a	136	C₁₀H₁₆	β-Myrcene	0.9	1.7
7.2	1008	1006 ^a	136	C₁₀H₁₆	α-Phellandrene	-	0.2
7.7	1028	1017 ^a	136	C₁₀H₁₆	α-Terpinene	0.7	1.5
8.0	1043	1026 ^a	134	C₁₀H₁₄	p-Cymene	2.6	10.3
8.1	1049	1030 ^b	136	C₁₀H₁₆	α-Limonene	-	0.5
8.5	1068	1048 ^b	136	C₁₀H₁₆	β-Ocimene	0.3	-
9.3	1101	1060 ^b	136	C₁₀H₁₆	γ-Terpinene	7.6	7.6
11.1	1132	1088 ^a	136	C₁₀H₁₆	α-Terpinolene	-	2.2
13.8	1177	1165 ^b	138	C₁₀H₁₈	2-Bornanol	0.4	-
19.9	1309	1293 ^a	150	C₁₀H₁₄O	m-Thymol	1.2	3.6
20.4	1322	1309 ^b	150	C₁₀H₁₄O	Carvacrol	79.5	64.6
24.3	1415	1420 ^b	204	C₁₅H₂₄	β-Caryophyllene	1.4	2.9
28.1	1508	1508 ^b	204	C₁₅H₂₄	β-Bisabolene	1.2	0.2
					Total identified	95.8	97.2

¹ RT: retention time; ² KI: Kovat index; ³ LKI: Kovat index from the literature; ⁴ MW: molecular weight; ⁵ HO: highland O. vulgare oil from tropical region; ⁶ CO: commercial O. vulgare from Mediterranean region; ^a Kovat index on a DIM-5MS column from Bejaoui et al., 2013; ^b Kovat index on a DIM-5MS column from Babushok et al., 2011.