Table 3.
Volatile flavor compounds content of soybean fermented by lactic acid bacter ia isolated from fermented soybean paste (unit: ppm)

Flavor compounds RT1) (min) I132) JSA22 JSB22
<Esters>
formic acid, ethyl ester 7.076 2.87 2.02 1.74
acetic acid ethyl ester 8.495 51.37 56.74 44.79
<Ketones>
2-butanone 8.901 5.60 3.63 ND3)
2-butanone, 3-methyl- 11.744 0.68 0.81 ND
cyclohexanone 59.011 ND 4.57 ND
1-pentanone, 4,5-dimethoxy-2,2-dimethyl-1-phenyl- 67.049 ND 3.76 ND
3-thiolannone 84.883 ND 8.74 ND
<Alcohols>
2-hydroxypropane 9.974 ND ND 1.60
2-butanol 14.085 3.69 3.90 10.56
2-propanol 30.840 40.85 19.36 ND
bicyclo[4.1.0]hept-3-ene-2-thiol, 3,7,7-trimethyl-,[1s-(1.alpha.,2.alpha.,6.alpha.)]- 42.784 ND ND 1.87
2,3-butanediol 44.449 0.68 0.94 2.81
2-naphthalenol, 1,2-dihydro-1,1-dimethyl-, acetate 72.001 0.14 0.40 ND
1,1-dimethoxy-3,3-dimethyl-2-butanol 81.283 ND 0.54 ND
<Hydrocarbons>
cyclohexane, methyl- 6.104 16.12 16.81 16.31
heptane 6.342 2.32 2.42 2.27
1,4-dioxane, 2,5-dimethyl- 9.838 0.82 0.81 ND
benzene 10.159 81.43 82.56 98.54
benzene, chloro- 25.448 3.42 3.50 3.48
propane 41.968 95.23 79.33 ND
1-acetoxy-2,5-ochtodadiene 43.703 ND 2.02 ND
trans-9-fluoro-2,2,3,3-tetramethoxy-7,7-dimethyl-1-oxaspiro[3,5]non-5-ene 44.058 0.68 0.94 0.53
hexadecane 50.188 0.82 1.08 0.94
naphthalene 56.034 0.82 1.21 4.14
methylnaphthalene 61.605 ND ND 8.16
1-phenyl-4-penten-1-yne 66.917 ND ND 2.27
(triethylsilyl)germane 73.258 0.14 0.40 ND
cis-2,3-epoxyheptane 85.817 ND 3.76 ND
<Heterocyclic compounds>
2-acetyltetrahydrofuran 7.949 1.78 0.67 ND
pyrrolidine, 1-(1-isobutyl-3-methyl-1-butenyl)- 22.900 23.64 23.93 22.86
<Acids>
acetic acid 41.520 ND ND 90.65
1-cyclopentene-1-carboxylic acid 77.092 ND 19.36 ND
2-propenoic acid, 2-methyl 82.173 ND 2.02 ND
hexadecanoic acid, ethyl este 83.683 ND 4.57 ND
<Others>
disulfide, dioctyl 24.182 1.91 0.40 0.80
diethyldisulfide 25.311 0.82 0.94 1.07
formamide, n-formyl-n-methyl- 65.152 7.51 8.74 ND
1-(1,3-benzodioxol-5-yl)-n-ethyl-2-propanamine 74.866 ND 3.50 ND
acetamide, 2-(diethylamino)-n-(2,6-dimethylphenyl)- 81.975 ND 79.33 ND
RT, retention time.
I13, Lactococcus lactis I13; JSA22, Lactobacillus plantarum JSA22; JB22, L. brevis JSB22.
ND, not detected