Table 6. Changes in acetic acid of peach vinegar during fermentation period at various initial pH and temperature
(unit: mg/100 mL)
pH | Temperature (°C) | Fermentation period (days) |
0 | 3 | 6 | 9 | 14 |
pH 3 | 20 | 444.9±10.61)a2) | 921.0±1.9b | 1,088.6±3.0c | 2,856.5±19.3d | 5,912.5±16.5b |
30 | 444.9±10.6a | 1,015.2±3.2a | 3,406.2±4.2a | 5,551.7±15.0a | 5,668.4±13.7c |
35 | 444.9±10.6a | 723.6±1.2d | 912.2±4.2e | 693.3±0.6h | 2,516.6±2.6f |
pH 4 | 20 | 324.4±3.5b | 577.3±1.6f | 1,015.2±11.6d | 4,376.4±116.0b | 6,171.3±220.3a |
30 | 324.4±3.5b | 785.9±0.6c | 2,785.7±47.1b | 4,289.6±21.7c | 4,659.1±39.7e |
35 | 324.4±3.5b | 577.4±29.5f | 485.1±0.5i | 1,095.9±1.6f | 4,897.2±24.5d |
pH 5 | 20 | 307.0±1.2c | 602.9±1.6e | 817.3±1.9f | 931.1±9.0g | 4,589.6±7.9e |
30 | 307.0±1.2c | 712.0±0.6d | 785.6±3.8g | 2,721.5±5.5e | 4,578.8±7.7e |
35 | 307.0±1.2c | 579.4±1.5f | 548.9±1.2h | 507.0±0.3i | 460.0±5.7g |
Data values were expressed as mean±SD of triplicate determinations.
Values followed by the same letter are not statistically different by Duncan’s multiple range test (p<0.05).