Microencapsulation, Chemical Characterization, and Antimicrobial Activity of Mexican (Lippia graveolens H.B.K.) and European (Origanum vulgare L.) Oregano Essential Oils

Table 2

Headspace volatile compounds identified from microcapsules of Lippia  graveolens H.B.K. and Origanum  vulgare L. essential oils by headspace extraction.

Number	Compound	Composition; (area units^a  × 10^6)		KI^b	KI^c	Identification method	Reference
		Lippia graveolens	Origanum vulgare
1	2-Ethyl-furan	0.70	1.55	696	691	KI, MS	[38]
2	2-Methyl-butanoic acid ethyl ester	1.12		852	848	KI, MS	[37]
3	-Pinene	42.64	552.28	925	926	KI, MS	[7]
4	Camphene	5.83	17.58	955	954	KI, MS	[38]
5	Benzaldehyde	1.79		968	970	KI, MS	[38]
6	-Pinene	455.61		982	981	KI, MS	[38]
7	-Phellandrene	26.34	254.41	1010	1007	KI, MS	[38]
8	3-Carene	3.21	620.39	1012	1011	KI, MS	[38]
9	-Terpinene	379.89		1022	1024	KI, MS	[38]
10	p-Cymene		1297.17	1031	1029	KI, MS	[38]
11	D-Limonene	31.88		1035	1031	KI, MS	[38]
12	-Ocimene	10.11	133.89	1049	1050	KI, MS	[38]
13	-Terpinene	1901.53	3937.65	1068	1063	KI, MS	[38]
14	Terpinolene	3.40	2343.48	1090	1089	KI, MS	[38]
15	neo-allo-Ocimene		9.86	1130	1129	KI, MS	[39]
16	-Terpineol		101.54	1206	1203	KI, MS	[38]
17	Thymol methyl ether	163.36	153.34	1235	1235	KI, MS	[38]
18	Isothymol methyl ether		1467.36	1245	1244	KI, MS	[38]
19	Thymol	1097.05	171.95	1288	1290	KI, MS	[38]
20	Carvacrol	2297.22	255.86	1300	1299	KI, MS	[38]
21	Eugenol	1.78		1362	1362	KI, MS	[38]
22	Ylangene	0.62		1384	1375	KI, MS	[3]
23	Copaene	1.76		1390	1382	KI, MS	[3]
24	Caryophyllene	121.66	301.65	1441	1444	KI, MS	[38]
25	trans--Bergamotene	13.13		1445	1436	KI, MS	[38]
26	Humulene	58.29	31.96	1477	1477	KI, MS	[38]
27	Alloaromadendrene		14.72	1482	1478	KI, MS	[39]
28	Germacrene D		76.27	1502	1503	KI, MS	[38]
29	-Bisabolene	20.98		1519	1509	KI, MS	[38]
30	-Cadinene	1.85	10.04	1533	1525	KI, MS	[38]

^aArea unit is equivalent to chromatographic peak area produced for each compound.
^bCalculated Kovats retention indices.
^cKovats retention indices reported in literature.