Evaluation of pH
| Trial | n | Average pH at 0 h | Average pH at 1 h | Average pH at 2 h |
| 1 | 3 | 5.07 ± 3.43 | 5.18 ± 2.44 | 5.18 ± 0.13 |
| 2 | 2 | 5.61 ± 0.02 | 5.78 ± 2.68 | 5.85 ± 0.88 |
| 3 | 3 | 5.58 ± 0.07 | 5.77 ± 0.34 | 5.47 ± 0.94 |
| 4 | 3 | 5.30 ± 2.09 | 5.38 ± 0.09 | 5.59 ± 0.16 |
| 5 | 3 | 5.58 ± 0.44 | 5.87 ± 0.60 | 5.77 ± 2.42 |
| 6 | 3 | 5.62 ± 1.98 | 5.84 ± 1.93 | 5.88 ± 1.11 |