Table 5.
Effect of chitosan coating on albumen and yolk pH of eggs during 5-week of storage at 22 ± 1 and 32 ± 1 °C
| Storage period (Week) | Egg samples | |||||||
|---|---|---|---|---|---|---|---|---|
| NCE | ACE | ESC | ETC | |||||
| pH | ||||||||
| Albumen | Yolk | Albumen | Yolk | Albumen | Yolk | Albumen | Yolk | |
| 0 | 8.4 | 5.8 | 8.4 | 5.8 | 8.4 | 5.8 | 8.4 | 5.8 |
| (a) Storage temperature 22 ± 1 °C | ||||||||
| 1 | 9.0 | 6.0 | 9.2 | 6.0 | 8.9 | 6.1 | 8.9 | 6.1 |
| 2 | 9.5 | 6.3 | 9.6 | 6.2 | 9.2 | 6.1 | 9.2 | 6.2 |
| 3 | 9.5 | 6.4 | 9.6 | 6.4 | 9.3 | 6.3 | 9.1 | 6.3 |
| 4 | 9.5 | 6.2 | 9.4 | 6.1 | 9.1 | 6.6 | 8.9 | 6.1 |
| 5 | 9.5 | 6.9 | 9.4 | 6.6 | 8.8 | 6.2 | 8.9 | 6.3 |
| (b) Storage temperature 32 ± 1 °C | ||||||||
| 1 | 9.4 | 6.4 | 9.1 | 6.2 | 9.3 | 6.4 | 8.8 | 6.2 |
| 2 | 9.6 | 6.5 | 9.5 | 6.9 | 9.4 | 6.7 | 8.7 | 6.3 |
| 3 | 9.6 | 6.8 | 9.5 | 7.1 | 9.5 | 7.3 | 8.5 | 6.4 |
| 4 | 9.6 | 7.0 | 9.5 | 6.9 | 9.0 | 7.1 | 8.5 | 6.3 |
| 5 | na | na | na | na | na | na | na | na |
NCE non-coated egg, ACE egg with acetic acid coat, ESC egg with one-time chitosan coat, ETC egg with three-time chitosan coat, na not analyzed