Table 4 The peak ratio of distillated Soju (alcohol 25%) prepared with isolated and industr ial yeas

No.	Compounds	Retention index1)	Relative concentration (×100 μg/L)2)
			N4	N9	C4	CM	LP
				(Alcohol)
1	i-BuOH	1099	4.37	4.63	3.30	3.64	4.62
2	1-Butanol	1152	0.07	0.06	0.11	0.12	0.12
3	i-AmOH	1234	20.48	16.98	26.62	15.72	21.97
4	2-Ethyl-1-hexanol	1474	0.06	0.07	0.06	ND3)	0.08
5	Phenethyl alcohol	1867	1.51	1.17	2.64	1.06	0.75
6	Farnesol	2316	0.27	0.17	0.62	0.25	0.31
	(Ester)
7	Ethyl acetate	932	9.28	12.35	8.66	6.52	11.17
8	Isobutyl acetate	1015	0.23	ND	0.27	ND	ND
9	Ethyl butyrate	1036	1.61	0.55	1.19	ND	1.39
10	Ethyl isovalerate	1066	ND	ND	0.01	ND	ND
11	Isoamyl acetate	1128	6.68	4.79	16.59	4.22	7.3
12	Isoamyl propionate	1210	0.05	0.03	0.10	0.10	0.06
13	Ethyl caproate	1263	5.39	4.85	6.28	4.29	5.60
14	Isoamyl butyrate	1297	0.07	ND	0.07	0.03	0.02
15	Propyl caproate	1341	0.01	0.01	0.01	0.02	0.01
16	Ethyl heptanoate	1358	0.02	0.01	0.03	0.03	0.02
17	Isobutyl caproate	1374	0.03	0.04	0.02	0.04	0.03
18	Ethyl caprylate	1450	39.43	37.2	42.89	40.39	44.71
19	Isoamyl caproate	1460	0.13	0.10	0.16	0.14	0.15
20	Propyl caprylate	1501	0.03	0.03	0.04	0.10	0.06
21	Ethyl nonanoate	1518	0.17	0.15	0.13	ND	0.15
22	Isobutyl caprylate	1536	0.06	0.08	0.05	0.1	0.06
23	Ethyl methyl succinate	1604	0.01	0.03	0.02	0.05	0.02
24	Ethyl caprate	1632	17.53	15.07	11.55	13.94	12.08
25	Isopentyl octanoate	1644	0.08	0.06	0.1	0.09	0.09
26	Diethyl succinate	1648	0.33	0.39	3.64	0.21	0.21
27	Phenethyl acetate	1783	2.55	1.14	6.77	2.32	1.32
28	Ethyl laurate	1824	0.20	0.18	0.14	0.22	0.18
	(Aldehyde)
29	Nonanal	1404	0.07	0.05	0.07	0.07	0.08
30	Furfural	1448	0.14	0.22	0.2	0.27	0.19
31	Decanal	1482	0.04	0.05	0.06	0.08	0.09
32	2-Nonenal	1507	0.04	0.04	0.04	0.05	0.04
	(Fatty acid)
33	Caprylic acid	2018	0.15	0.27	0.32	0.11	0.23
34	Capric acid	2229	1.61	1.14	1.64	0.72	1.46
35	Lauric acid	2438	0.52	0.42	0.57	0.29	0.66
36	Tetradecanoic acid	2634	0.40	0.42	0.36	0.31	0.55
	(Phenol)
37	4-Vinylguaiacol	2142	0.05	0.07	0.06	0.07	0.07
	(Ketone)
38	2-Undecanone	1575	0.07	0.06	0.01	0.04	0.05
	(Acetal)
39	Isobutanal diethyl acetal	992	0.29	0.40	0.33	0.15	0.19
40	PADA4)	1692	0.25	0.20	0.15	0.57	0.28
41	Isovaleraldehyde diethyl acetal	1075	0.73	0.73	0.26	1.13	ND

Retention index calculated on a DB-WAX capillary column with a series of n-alkanes (C7-C33).
Volatile compounds were calculated with the relative peak ratio of their peak areas to that of internal standard.
ND means not detected.
PADA means phenyl acetaldehyde diethyl acetal.