Table 4. Compounds identified in aldehydic fraction isolated from essential oil of fresh ginseng root

Peak no.	RT1) (min)	Compound2)	m/z	RI3)	Peak area (%)4)
1	3.69	n-Butanal	72	990	0.20
2	4.37	n-Pentanal	96	1,019	0.35
3	5.78	n-Hexanal	100	1,080	3.23
4	6.14	2-Methyl-2-butenal5)	84	1,093	0.27
5	8.47	2-Methyl-2-pentenal5)	98	1,164	0.25
6	9.20	n-Heptanal	114	1,183	9.42
7	10.30	trans-2-Hexenal	98	1,210	0.41
8	11.54	cis-2-Heptenal	112	1,242	0.49
9	13.52	n-Octanal	128	1,285	2.77
10	16.01	trans-2-Nonenal	140	1,328	0.36
11	16.69	4-Hydroxy-4-methylpentan-2-one5)	116	1,359	3.86
12	20.37	2-Cyclohexene-1-carboxaldehyde	110	1,431	0.25
13	20.79	trans,cis-2,4-Heptadienal	110	1,439	4.62
14	20.91	2-Furfural	96	1,441	7.10
15	21.65	trans,trans-2,4-Heptadienal	110	1,453	0.87
16	22.73	n-Decanal	156	1,492	0.18
17	23.41	Benzaldehyde	106	1,509	10.18
18	25.14	5-Methyl-2-furfural	110	1,551	0.41
19	25.92	trans-6-Methyl-3,5-heptadien-2-one	124	1,570	0.11
20	27.17	3-Methylbenzaldehyde	120	1,598	0.97
21	28.39	Phenylacetaldehyde	120	1,630	0.51
22	29.38	2-Thiophene carboxaldehyde	112	1,655	0.37
23	30.43	2-Thiophene carboxaldehyde (isomer)	112	1,682	0.36
24	35.88	2-Acetylcyclohexanone	140	1,822	0.45
25	36.63	3-(α-Furyl)propenal	122	1,844	8.51
26	37.70	2-Methyl-3-β-furyl propenal5)	136	1,873	2.15
27	38.52	4-(2-Furyl)-2-buten-2-one5)	136	1,896	23.41
28	39.37	2-Phenyl-2-butenal5)	148	1,920	7.28
29	40.34	3-(2-Furanyl)-3-penten-2-one5)	150	1,947	0.30
30	40.53	4-Hydroxyacetophenone5)	136	1,953	0.25
31	41.99	2-Methyl-3-phenyl-2-propenal5)	146	2,001	0.38
32	42.53	4-Hydroxy-3-methylaceto phenone5)	150	2,009	0.17
33	43.56	4-Methyl-2-phenyl-2-pentenal5)	174	2,040	1.50
34	44.38	5-Methyl-2-phenyl-2-hexenal5)	188	2,065	1.33
35	45.63	trans-4-Phenyl-3-buten-3-one5)	146	2,104	1.93
36	46.72	5-Methyl-2-phenyl-2-hexenal (isomer)5)	188	2,138	0.55
37	49.89	2-Phenyl-2-octenal6)	202	2,238	2.21
38	53.03	2-Phenyl-2-nonenal6)	216	2,342	0.61
Total					98.57

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.
Comparison of mass spectra and GC retention time with reaction mixtures of phenylacetaldehyde and n-hexanal or n-heptanal.