Table 1.
pH, titratable acidity, and reducing sugars' values for soup stored for 4 and 8 h at different temperature (°C) and pressure (MPa) conditions. Different letters indicate significant differences (P < 0.05) between conditions (a–d) and storage time to the same storage condition (A–B). Values at 4 and 8 h showed at bold are statistically different from the initial value for each parameter and storage condition
| Conditions | pH | Titratable acidity (mg malic acid/100 g soup) | Reducing sugars (mg glucose/g soup) | ||||
|---|---|---|---|---|---|---|---|
| 4 h | 8 h | 4 h | 8 h | 4 h | 8 h | ||
| Initial | 5.65 ± 0.07 bA | 5.65 ± 0.07 bcdA | 63.65 ± 5.59 abcA | 63.65 ± 5.59 bA | 6.40 ± 0.32 abA | 6.40 ± 0.32 aA | |
| 4°C | 0.1 MPa | 5.57 ± 0.04 bA | 5.63 ± 0.17 bcdA | 66.20 ± 4.14 abcA | 70.04 ± 4.57 bcA | 6.89 ± 0.24 abA | 6.72 ± 0.30 aA |
| 25°C | 0.1 MPa | 5.66 ± 0.20 bA | 5.72 ± 0.01 cdA | 50.89 ± 3.15 aA | 53.46 ± 1.43 aA | 6.42 ± 0.35 abA | 6.10 ± 0.13 aA |
| 100 MPa | 5.54 ± 0.05 b | –a | 63.59 ± 3.00 abc | –a | 7.56 ± 0.80 b | –a | |
| 150 MPa | 5.66 ± 0.01 bA | 5.87 ± 0.02 dB | 55.35 ± 1.85 abA | 47.28 ± 1.12 aB | 7.13 ± 0.34 abA | 6.85 ± 0.59 aA | |
| 30°C | 0.1 MPa | 5.10 ± 0.15 aA | 4.46 ± 0.14 aB | 79.44 ± 5.33 cA | 90.50 ± 2.62 dA | 5.97 ± 0.28 aA | 8.01 ± 0.36 bB |
| 100 MPa | 5.61 ± 0.03 bA | 5.44 ± 0.01 bB | 65.69 ± 2.11 abcA | 76.06 ± 1.73 cB | 6.01 ± 0.50 aA | 9.43 ± 0.19 cB | |
| 150 MPa | 5.74 ± 0.12 bA | 5.58 ± 0.01 bcA | 70.81 ± 8.41 bcA | 66.95 ± 1.86 bA | 6.13 ± 0.21 abA | 6.62 ± 0.29 aA | |
a
Experiments were not carried out in these conditions.