Table 2 Change on pH, titratable acidity and reducing sugar of Doenjang according to manufacturing method of soybean paste during fermentation period
Contents | Doenjang group | NaCl (%) | Fermentation period (week) |
0 | 2 | 4 | 8 | 12 | 16 | 20 | 24 |
pH | Soaking Doenjang | 8 | 5.7±0.0a1) | 5.6±0.0a | 5.2±0.0a | 5.3±0.0a | 5.3±0.0a | 5.3±0.0a | 5.4±0.0a | 5.3±0.0a |
12 | 5.3±0.0b | 5.3±0.0b | 5.2±0.0b | 5.1±0.0b | 5.1±0.0b | 5.1±0.0b | 5.1±0.0b | 5.0±0.0b |
Non-soaking Doenjang | 8 | 5.0±0.0c | 5.0±0.0c | 5.0±0.0c | 4.9±0.0d | 4.9±0.1c | 4.9±0.0c | 5.1±0.0b | 5.0±0.0b |
12 | 5.0±0.0c | 5.0±0.0c | 5.0±0.0c | 5.0±0.0c | 4.9±0.0c | 4.9±0.0c | 5.0±0.0b | 4.9±0.0c |
Titratable acidity (%) | Soaking Doenjang | 8 | 1.3±0.0d | 1.6±0.0d | 2.1±0.0b | 2.2±0.0b | 1.9±0.0b | 2.1±0.0b | 2.2±0.0b | 1.8±0.0d |
12 | 1.3±0.0c | 1.6±0.0c | 1.9±0.0c | 2.0±0.0c | 1.8±0.0c | 2.0±0.1b | 1.9±0.0d | 1.9±0.0c |
Non-soaking Doenjang | 8 | 2.0±0.0a | 2.2±0.0a | 2.2±0.0a | 2.3±0.0a | 2.3±0.1a | 2.4±0.0a | 2.3±0.1a | 2.3±0.0a |
12 | 1.9±0.0b | 2.0±0.0b | 2.0±0.0b | 2.2±0.0b | 2.0±0.0b | 2.1±0.0b | 2.0±0.0c | 2.1±0.0b |
Reducing sugar (%) | Soaking Doenjang | 8 | 2.0±0.1b | 2.2±0.0d | 2.1±0.0d | 2.3±0.2d | 1.9±0.0d | 0.9±0.0d | 0.9±0.0d | 1.3±0.0d |
12 | 1.9±0.1bc | 2.4±0.0c | 2.5±0.1c | 2.5±0.0c | 2.2±0.0c | 1.0±0.0c | 1.0±0.0c | 1.5±0.0c |
Non-soaking Doenjang | 8 | 2.4±0.1a | 3.3±0.1a | 3.3±0.1a | 3.6±0.1a | 3.0±0.0a | 1.5±0.1a | 1.5±0.0a | 2.3±0.0a |
12 | 1.8±0.1c | 2.8±0.1b | 2.9±0.2b | 2.9±0.0b | 2.7±0.0b | 1.3±0.0b | 1.2±0.0b | 1.9±0.0b |
Means±SD (n=3) within each column followed by the same letter are not significantly different (p<0.05).