Table 1.

Components of essential oils of Pluchea dioscoridis and Erigeron bonariensis.

No	Rt [a]	Compound Name	MF	KILit [b]	KIExp [c]	Relative Concentration %
						P. discodirdis	E. bonariensis
		Monoterpenes				0.19%	14.16%
1	4.13	α-Pinene	C10H16	933	934	0.19 ± 0.01	0.18 ± 0.01
2	5.43	α-Myrcene	C10H16	991	990	------	0.20 ± 0.01
3	6.41	O-Ocimene	C10H16	1012	1012	------	12.58 ± 0.09
4	6.91	D-Limonene	C10H16	1035	1036	------	1.20 ± 0.04
		Sesquiterpenes				93.4%	81.06%
5	16.22	β-Caryophyllene	C15H24	1418	1420	4.95 ± 0.07	2.17 ± 0.04
6	16.96	Aromandendrene	C15H24	1439	1448	------	0.12 ± 0.03
7	17.17	α-Guaiene	C15H24	1439	1439	0.21 ± 0.02	0.11 ± 0.02
8	17.39	α-Maaliene	C15H24	1480	1479	18.84 ± 0.08	6.64 ± 0.09
9	17.60	Berkheyaradulen	C15H24	1492	1493	13.99 ± 0.09	4.82 ± 0.06
10	18.36	β-Muurolene	C15H24	1493	1493	8.09 ± 0.05	2.37 ± 0.04
11	18.57	α-Muurolene	C15H24	1498	1499	2.20 ± 0.04	3.99 ± 0.07
12	18.98	Bicyclogermacrene	C15H24	1500	1501	------	0.66 ± 0.01
13	19.67	trans-α-Farnesene	C15H24	1508	1507	------	25.03 ± 0.13
14	19.73	α-Bisabolene	C15H24	1509	1511	0.58 ± 0.03	------
15	19.84	γ-Cadinene	C15H24	1514	1515	1.36 ± 0.04	------
16	20.35	α-Sesquiphellandrene	C15H24	1516	1517	0.44 ± 0.01	------
17	20.45	cis-Lanceol	C15H24O	1525	1527	0.16 ± 0.02	0.09 ± 0.01
18	20.54	Isolongifolene-5-ol	C15H24O	1534	1535	0.19 ± 0.01	5.53 ± 0.07
19	20.64	Germacrene D-4-ol	C15H24	1574	1576	------	2.35 ± 0.04
20	20.81	Spathulenol	C15H24O	1576	1577	0.81 ± 0.03	0.10 ± 0.01
21	20.98	Isoaromadendrene epoxide	C15H24O	1580	1579	------	1.50 ± 0.03
22	21.41	Calarenepoxide	C15H24O	1592	1592	------	1.07 ± 0.02
23	21.56	Caryophyllene oxide	C15H24O	1594	1593	0.86 ± 0.02	0.08 ± 0.01
24	21.66	Salvial-4(14)-en-1-one	C15H24O	1595	1595	2.20 ± 0.04	0.38 ± 0.01
25	21.93	Ledene alcohol	C15H24O	1729	1731	------	0.97 ± 0.03
26	22.1	Carotol	C15H26O	1597	1598	0.78 ± 0.02	------
27	22.42	Humuladienone	C15H24O	1607	1605	------	0.32 ± 0.01
28	23.09	Neoclovenoxid	C15H24O	1608	1610	0.90 ± 0.02	0.51 ± 0.03
29	23.33	Cubenol	C15H26O	1642	1642	------	0.74 ± 0.02
30	23.49	Farnesol	C15H26O	1722	1720	1.35 ± 0.05	------
31	23.55	Ledene oxide-(i)	C15H24O	1668	1667	------	10.93 ± 0.10
32	23.65	Dendrolasin	C15H22O	1574	1575	2.85 ± 0.06	8.37 ± 0.09
33	23.81	Torreyol	C15H26O	1645	1644	------	0.55 ± 0.02
34	25	Isospathulenol	C15H24O	1625	1627	1.90 ± 0.05	------
35	25.22	tau-Muurolol	C15H26O	1646	1646	3.88 ± 0.08	0.51 ± 0.03
36	25.32	Aromadendrene oxide-2	C15H24O	1650	1649	8.81 ± 0.11	0.38 ± 0.02
37	25.85	α-Eudesmol	C15H26O	1652	1653	6.79 ± 0.08	0.77 ± 0.01
38	26.69	γ-Cadinol	C15H26O	1654	1655	0.91 ± 0.04	------
39	26.92	Dehydro-cyclolongifolene oxide	C15H24O	1657	1658	10.35 ± 0.12	------
		Diterpenes				------	2.44%
40	30.47	Neophytadiene	C20H38	1840	1840	------	2.44
		Carotenoids derived compounds				0.28%	------
41	27.36	α-Ionone	C13H20O	1426	1426	0.28 ± 0.01	------
		Others				1.33%	0.55%
42	18.66	1-Butanone, 1-(2,3,4,5-tetramethylphenyl)-	C14H20O	1660	1661	0.46 ± 0.03	0.32 ± 0.02
43	26.32	Methyl 2,5-octadecadiynoate	C19H30O2	1980	1980	0.64 ± 0.03	0.13 ± 0.01
44	42.28	n-Pentacosane	C25H52	2500	2500	------	0.10 ± 0.01
45	45.48	n-Heptacosane	C27H56	2700	2700	0.23±0.01	------
		Total				96.91%	98.21%

^[a] Rt: retention time, ^[b] Literature Kovats retention index on DB-5 column with reference to n-alkanes [36], ^[c] experimental Kovats retention index; values of each compound are average ± SD from duplicates. The identification of essential oil (EO) components was performed based on the (a) mass spectral data of compounds (MS) and (b) Kovats indices with those of Wiley spectral library collection and NIST (National Institute of Standards and Technology) library database.