| Sample Brands | pH (pH unit) | |||
| Morning | Afternoon | Evening | Mean | |
| TEX | 4.6 | 3.8 | 4.0 | 4.1 |
| Blue Diamond | 5.0 | 4.7 | 4.4 | 4.7 |
| JAH | 5.1 | 5.0 | 5.3 | 5.1 |
| KUMA | 5.2 | 5.8 | 6.0 | 5.7 |
| JAGISA | 6.5 | 6.0 | 5.8 | 6.1 |