Table 7. The volatile compound according to fermentation period of Kujippong vinegar by optimum conditions using Acetobacter pasteurianus A37

(Unit : Area%)

Treatment¹⁾Period (days) pH 4, 20℃

0 6 12 18 24 30

Compounds

Acetic acid ethyl ester 16.03±0.88^c2) 11.70±0.45^c 59.37±1.94^b 72.07±4.74^a 67.54±3.04^a 59.18±2.60^b

1,1-Diethoxyethane ND³⁾ ND ND ND ND ND

Ethanol 26.86±0.44^a 27.53±3.25^a 12.53±1.21^b 3.88±0.16^c 2.29±0.19^c 1.47±0.13^c

Propyl acetate ND ND 0.18±0.02^b 0.31±0.08^a 0.31±0.04^a 0.29±0.02^a

Isobutyl acetate ND ND 0.27±0.06^b 1.07±0.20^a 1.00±0.29^a 0.84±0.11^a

2-Methyl-1-propanol 1.40±0.05^a 1.48±0.14^a 0.75±0.08^b 0.48±0.03^c 0.64±0.06^b 0.63±0.06^b

3-Methyl butyl acetate ND ND 0.73±0.29^b 2.79±0.68^a 2.43±1.12^a 2.27±0.39^a

1-Butanol ND ND ND ND ND ND

3-Methyl-1-butanol 10.32±0.04^a 10.70±1.08^a 5.94±0.53^b 3.84±0.20^d 5.51±0.41^bc 4.75±0.47^cd

Octanal 0.33±0.01^b 0.86±0.06^a 0.23±0.05^c 0.13±0.02^d 0.13±0.00^d 0.27±0.02^bc

Nonanal 0.76±0.05^b 1.55±0.20^a 0.50±0.13^c 0.34±0.04^cd 0.25±0.03^d 0.55±0.14^bc

2-Ethylhexanol 1.84±0.09^b 2.38±0.33^a 1.17±0.05^c 0.84±0.06^d 0.98±0.08^cd 1.27±0.22^c

Decanal 1.74±0.01^b 2.67±0.26^a 0.90±0.23^c 0.65±0.28^c 0.50±0.05^c 1.43±0.37^b

2-Hydroxy benzoic acid methyl ester 11.87±0.27^a 1.96±0.24^bc 2.68±0.42^bc 2.82±1.71^bc 3.27±0.14^b 1.58±0.21^c

¹⁾pH 4, initial acidity; 20℃, fermentation temperature.
²⁾Means±SD. Different letters in the same row are significantly different (p<0.05) by duncan’s multiple range test.
³⁾ND, not detected.

Treatment¹⁾Period (days)	pH 4, 20℃
Treatment¹⁾Period (days)	0	6	12	18	24	30
Compounds	0	6	12	18	24	30
Acetic acid ethyl ester	16.03±0.88^c2)	11.70±0.45^c	59.37±1.94^b	72.07±4.74^a	67.54±3.04^a	59.18±2.60^b
1,1-Diethoxyethane	ND³⁾	ND	ND	ND	ND	ND
Ethanol	26.86±0.44^a	27.53±3.25^a	12.53±1.21^b	3.88±0.16^c	2.29±0.19^c	1.47±0.13^c
Propyl acetate	ND	ND	0.18±0.02^b	0.31±0.08^a	0.31±0.04^a	0.29±0.02^a
Isobutyl acetate	ND	ND	0.27±0.06^b	1.07±0.20^a	1.00±0.29^a	0.84±0.11^a
2-Methyl-1-propanol	1.40±0.05^a	1.48±0.14^a	0.75±0.08^b	0.48±0.03^c	0.64±0.06^b	0.63±0.06^b
3-Methyl butyl acetate	ND	ND	0.73±0.29^b	2.79±0.68^a	2.43±1.12^a	2.27±0.39^a
1-Butanol	ND	ND	ND	ND	ND	ND
3-Methyl-1-butanol	10.32±0.04^a	10.70±1.08^a	5.94±0.53^b	3.84±0.20^d	5.51±0.41^bc	4.75±0.47^cd
Octanal	0.33±0.01^b	0.86±0.06^a	0.23±0.05^c	0.13±0.02^d	0.13±0.00^d	0.27±0.02^bc
Nonanal	0.76±0.05^b	1.55±0.20^a	0.50±0.13^c	0.34±0.04^cd	0.25±0.03^d	0.55±0.14^bc
2-Ethylhexanol	1.84±0.09^b	2.38±0.33^a	1.17±0.05^c	0.84±0.06^d	0.98±0.08^cd	1.27±0.22^c
Decanal	1.74±0.01^b	2.67±0.26^a	0.90±0.23^c	0.65±0.28^c	0.50±0.05^c	1.43±0.37^b
2-Hydroxy benzoic acid methyl ester	11.87±0.27^a	1.96±0.24^bc	2.68±0.42^bc	2.82±1.71^bc	3.27±0.14^b	1.58±0.21^c