Table 2. Compounds identified in basic fraction isolated from essential oil of fresh ginseng root

Peak no	RT1) (min)	Compound2)	m/z	RI3)	Peak area (%)4)
1	9.09	Pyridine	79	1,197	0.22
2	10.35	4-Methylpyridine5)	93	1,212	0.07
3	12.18	2,6-Dimethylpyridine5)	107	1,255	0.22
4	13.12	2-Ethylpyridine5)	107	1,281	0.09
5	14.76	2,5-Dimethylpyrazine	108	1,301	0.11
6	15.44	2-Ethylpyrazine5)	108	1,330	0.12
7	15.96	2,3-Dimethylpyrazine	108	1,358	0.73
8	17.20	2-Methoxy-3-methylpyrazine	124	1,369	8.40
9	17.83	2-Ethyl-6-methylpyrazine	122	1,375	0.12
10	18.52	2-Ethyl-3-methylpyrazine	122	1,397	0.34
11	18.65	2,3,5-Trimethylpyrazine	122	1,400	0.18
12	20.04	2-Isopropyl-3-methoxypyrazine	152	1,433	35.51
13	21.09	2-Ethyl-3,5-dimethylpyrazine5)	136	1,457	0.14
14	21.31	3-Isopropyl-2-methoxy-5-methylpyrazine	166	1,462	2.17
15	21.84	2,3,5,6-Tetramethylpyrazine	136	1,474	0.16
16	22.40	2,6-Diethyl-3-methylpyrazine	150	1,486	0.22
17	22.99	2-sec-Butyl-3-methoxypyrazine	166	1,498	1.31
18	23.04	2-Ethyl-3,5,6-trimethylpyrazine	150	1,501	0.20
19	23.56	3-sec-Butyl-2-methoxy-5-methylpyrazine	180	1,512	31.54
20	23.97	2-Isobutyl-3-methoxypyrazine	166	1,531	8.64
21	26.83	2-Acetylpyridine5)	121	1,614	0.25
22	27.80	2-Acetyl-3-methylpyrazine5)	136	1,634	1.91
23	28.55	2,3,5-Trimethylpyridine5)	121	1,662	1.43
24	38.47	2-Acetylpyrrole	109	1,904	0.24
25	39.46	2-Methylbenzothiazole5)	149	1,932	0.26
26	40.06	Benzothiazole5)	135	1,959	1.08
27	41.43	2-(2’-Furfuryl)pyrazine5)	160	1,978	0.34
28	47.33	2,2,4-Trimethyl-1,2-dihydroquinoline5)	173	2,126	0.27
29	48.35	2-Phenylpyrrole5)	143	2,163	0.12
Total					96.39

RT, retention time.
Searching of NIST mass spectral library and NIST Chemistry Webbook.
Retention indices on polar Supelcowax 10 capillary column.
Peak area (%) in total essential oil of fresh ginseng root.
Compound not reported previously in ginseng essential oil.