Table 6. The volatile compound according to fermentation period of Kujippong vinegar by optimum conditions using Acetobacter pasteurianus A26

(Unit : Area%)

Treatment¹⁾Period (days) pH 4, 20℃

0 6 12 18 24 30

Compounds

Acetic acid ethyl ester 7.12±1.51^c2) 7.10±1.11^c 28.45±1.70^ab 35.61±11.45^a 24.99±1.97^b 20.77±2.00^b

1,1-Diethoxyethane 2.06±0.52^a ND³⁾ ND ND ND ND

Ethanol 31.34±0.86^ab 35.66±1.52^a 25.33±2.93^bc 14.21±4.97^d 21.59±3.71^c 24.10±4.77^c

Propyl acetate ND ND ND ND ND ND

Isobutyl acetate ND ND ND ND ND ND

2-Methyl-1-propanol 1.73±0.13^a 1.31±0.34^b 1.02±0.22^bc 0.59±0.18^d 0.90±0.19^cd 0.56±0.12^d

3-Methyl butyl acetate ND ND ND ND ND ND

1-Butanol ND ND ND ND ND ND

3-Methyl-1-butanol 13.55±0.86^a 12.87±2.87^a 8.72±0.58^b 5.23±1.02^c 7.04±0.96^bc 5.77±0.37^bc

Octanal 0.28±0.03^a 0.22±0.06^ab 0.21±0.05^ab 0.11±0.04^b 0.24±0.04^a 0.18±0.12^ab

Nonanal 0.71±0.04^a 0.81±0.16^a 0.76±0.34^a 0.39±0.21^a 0.56±0.15^a 0.59±0.28^a

2-Ethylhexanol 2.33±0.26^a 2.47±0.33^a 1.99±0.14^a 1.37±0.30^b 2.05±0.16^a 2.04±0.36^a

Decanal 0.90±0.15^a 2.16±0.45^a 1.83±0.94^a 0.98±0.47^a 1.90±0.86^a 1.61±0.96^a

2-Hydroxy benzoic acid methyl ester 13.61±0.97^a 7.38±0.87^c 5.78±0.27^cd 4.55±1.19^d 9.93±1.28^b 9.50±1.45^b

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	7.12±1.51^c2)	7.10±1.11^c	28.45±1.70^ab	35.61±11.45^a	24.99±1.97^b	20.77±2.00^b
1,1-Diethoxyethane	2.06±0.52^a	ND³⁾	ND	ND	ND	ND
Ethanol	31.34±0.86^ab	35.66±1.52^a	25.33±2.93^bc	14.21±4.97^d	21.59±3.71^c	24.10±4.77^c
Propyl acetate	ND	ND	ND	ND	ND	ND
Isobutyl acetate	ND	ND	ND	ND	ND	ND
2-Methyl-1-propanol	1.73±0.13^a	1.31±0.34^b	1.02±0.22^bc	0.59±0.18^d	0.90±0.19^cd	0.56±0.12^d
3-Methyl butyl acetate	ND	ND	ND	ND	ND	ND
1-Butanol	ND	ND	ND	ND	ND	ND
3-Methyl-1-butanol	13.55±0.86^a	12.87±2.87^a	8.72±0.58^b	5.23±1.02^c	7.04±0.96^bc	5.77±0.37^bc
Octanal	0.28±0.03^a	0.22±0.06^ab	0.21±0.05^ab	0.11±0.04^b	0.24±0.04^a	0.18±0.12^ab
Nonanal	0.71±0.04^a	0.81±0.16^a	0.76±0.34^a	0.39±0.21^a	0.56±0.15^a	0.59±0.28^a
2-Ethylhexanol	2.33±0.26^a	2.47±0.33^a	1.99±0.14^a	1.37±0.30^b	2.05±0.16^a	2.04±0.36^a
Decanal	0.90±0.15^a	2.16±0.45^a	1.83±0.94^a	0.98±0.47^a	1.90±0.86^a	1.61±0.96^a
2-Hydroxy benzoic acid methyl ester	13.61±0.97^a	7.38±0.87^c	5.78±0.27^cd	4.55±1.19^d	9.93±1.28^b	9.50±1.45^b