Table 4. Volatile aroma components of nine tofu measured by electronic nose

Growing region Suwon Daegu Gimje
Cultivars Daewonkong Seonyu2ho Seonpung Daewonkong Seonyu2ho Seonpung Daewonkong Seonyu2ho Seonpung
RT Compounds Odor description (Unit: peak area)
12.14 Acetaldehyde Ethanol floral, green 1,331.70 2,890.00 2,109.70 2,172.10 2,717.80 4,238.70 2,682.60 7,729.50 6,454.10
13.01 2-Methylbutane Dimethyl sulfide sulforous 2,881.50 3,712.00 4,098.30 3,683.00 4,394.10 3,233.80 4,614.10 6,749.10 5,187.20
22.82 Trichloroethylene Heptane sweet, ethereal 1,035.00 776.3 1,249.10 968.4 1,186.90 804.7 1,317.60 1,005.20 991.8
27.77 2-Methylthiophene Methyl 2-methylbutanoate meaty, roasted 332.9 322.1 2,806.00 3,191.00 3,323.40 1,170.60 1,570.20 4,863.20 4,535.00
30.15 Octane (E)-4-octene gasoline 1,889.60 451.2 1,022.00 1,730.50 2,683.60 651.6 3,152.90 392.5 202.2
35.53 Dibutyl ether 1-Hexanol ethereal, herbal 389.6 514.1 731.2 570.4 525.8 689.4 535.4 1,551.60 1,338.70
42.60 beta-Pinene woody, green, pine 376.4 339.5 351.2 313.7 313.7 303.2 285.5 313.9 258.9
44.71 Octamethylcyclotetrasiloxane odorless 1,361.40 1,043.10 1,372.60 1,189.30 1,080.80 881.6 1,068.30 1,091.70 1,170.10
47.15 Methyl cyclohexanecarboxylate fruity 385 313.7 296.6 253.6 262.8 241.1 196.4 219.3 157.9
57.82 Pyridine sickening, sour 431.3 221.8 189.9 200.3 195.3 193.5 192 243.9 217.8
63.68 Tridecane green 560.6 133.6 92.3 76.9 72.6 54.9 ND 52.7 53.4
69.32 Tetradecane mild waxy 716.6 277.9 113.9 96.9 90.9 180.1 123.4 110.3 97
Sum 11,691.60 10,995.30 14,432.80 14,446.10 16,847.70 12,643.20 15,738.40 24,322.90 20,664.10