Table 8. The volatile compound according to fermentation period of Kujippong vinegar by optimum conditions using Acetobacter pasteurianus B7

(Unit : Area%)

Treatment¹⁾Period (days) pH 4, 20℃

0 6 12 18 24 30

Compounds

Acetic acid ethyl ester 4.22±0.76^e2) 1.89±0.22^e 7.99±2.59^d 22.60±0.93^c 28.18±3.92^b 37.53±1.31^a

1,1-Diethoxyethane 1.98±0.51^a 0.76±0.20^b ND³⁾ ND ND ND

Ethanol 32.41±5.43^a 10.17±8.52^b 27.96±2.89^a 15.56±3.19^b 10.66±0.77^b 9.37±0.97^b

Propyl acetate ND ND ND ND ND ND

Isobutyl acetate ND ND ND ND ND ND

2-Methyl-1-propanol 1.24±0.19^a 0.75±0.10^b 1.12±0.33^ab 1.12±0.21^ab 1.12±0.11^ab 1.29±0.14^a

3-Methyl butyl acetate ND ND ND ND ND ND

1-Butanol 0.17±0.04^a 0.08±0.04^a 0.16±0.04^a 0.13±0.12^a 0.11±0.02^a 0.13±0.02^a

3-Methyl-1-butanol 12.43±0.38^a 7.47±1.87^b 10.12±1.66^a 11.68±1.18^a 9.89±1.37^a 11.52±1.06^a

Octanal 0.32±0.24^a 0.22±0.05^a 0.26±0.11^a 0.15±0.03^a 0.13±0.06^a 0.25±0.04^a

Nonanal 0.85±0.55^ab 0.67±0.14^abc 0.55±0.24^abc 0.42±0.11^bc 0.25±0.05^c 1.01±0.16^a

2-Ethylhexanol 2.37±0.28^ab 1.26±0.21^c 1.66±0.29^c 2.60±0.54^a 1.79±0.44^bc 2.31±0.04^ab

Decanal 1.62±0.70^a 0.85±0.20^ab 1.04±0.63^ab 0.60±0.22^b 0.43±0.05^b 1.24±0.41^ab

2-Hydroxy benzoic acid methyl ester 6.16±2.38^cd 3.99±0.36^d 10.59±2.18^b 15.84±0.90^a 7.60±1.34^c 6.82±0.23^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	4.22±0.76^e2)	1.89±0.22^e	7.99±2.59^d	22.60±0.93^c	28.18±3.92^b	37.53±1.31^a
1,1-Diethoxyethane	1.98±0.51^a	0.76±0.20^b	ND³⁾	ND	ND	ND
Ethanol	32.41±5.43^a	10.17±8.52^b	27.96±2.89^a	15.56±3.19^b	10.66±0.77^b	9.37±0.97^b
Propyl acetate	ND	ND	ND	ND	ND	ND
Isobutyl acetate	ND	ND	ND	ND	ND	ND
2-Methyl-1-propanol	1.24±0.19^a	0.75±0.10^b	1.12±0.33^ab	1.12±0.21^ab	1.12±0.11^ab	1.29±0.14^a
3-Methyl butyl acetate	ND	ND	ND	ND	ND	ND
1-Butanol	0.17±0.04^a	0.08±0.04^a	0.16±0.04^a	0.13±0.12^a	0.11±0.02^a	0.13±0.02^a
3-Methyl-1-butanol	12.43±0.38^a	7.47±1.87^b	10.12±1.66^a	11.68±1.18^a	9.89±1.37^a	11.52±1.06^a
Octanal	0.32±0.24^a	0.22±0.05^a	0.26±0.11^a	0.15±0.03^a	0.13±0.06^a	0.25±0.04^a
Nonanal	0.85±0.55^ab	0.67±0.14^abc	0.55±0.24^abc	0.42±0.11^bc	0.25±0.05^c	1.01±0.16^a
2-Ethylhexanol	2.37±0.28^ab	1.26±0.21^c	1.66±0.29^c	2.60±0.54^a	1.79±0.44^bc	2.31±0.04^ab
Decanal	1.62±0.70^a	0.85±0.20^ab	1.04±0.63^ab	0.60±0.22^b	0.43±0.05^b	1.24±0.41^ab
2-Hydroxy benzoic acid methyl ester	6.16±2.38^cd	3.99±0.36^d	10.59±2.18^b	15.84±0.90^a	7.60±1.34^c	6.82±0.23^c