Effect of inactivation temperature and pH on thermal inactivation parameters of Escherichia coli O157:H7 in pretreated watermelon juice.
| S/N | pH | Temperature (°C) | D-value (min) | F-value (min) | z-value (°C) | Activation energy, Ea (kJ/mol) |
|---|---|---|---|---|---|---|
| 1 | 4.5 | 70 | 21.0 ± 1.24c | 42.0 ± 2.37c | 8.0 ± 0.02a | 42.03 ± 2.43b |
| 80 | 17.7 ± 1.12b | 35.4 ± 2.29b | ||||
| 90 | 11.8 ± 1.07a | 23.6 ± 2.26a | ||||
| 2 | 5.5 | 70 | 22.6 ± 1.36c | 45.2 ± 2.39c | 9.2 ± 0.06b | 32.49 ± 2.33a |
| 80 | 18.1 ± 1.20b | 36.2 ± 2.30b | ||||
| 90 | 13.7 ± 1.11a | 27.4 ± 2.25a | ||||
| 3 | 6.5 | 70 | 23.4 ± 2.38c | 46.8 ± 2.41c | 9.6 ± 0.07b | 35.26 ± 2.34a |
| 80 | 20.0 ± 2.22b | 40.0 ± 2.39b | ||||
| 90 | 14.5 ± 2.14a | 29.0 ± 2.28a |
Values are means ± standard deviation, values in the columns with the same superscripts are not significantly different at (p < 0.05).