Table 3.
Color parameters, pH value, and acidity of the pH-sensing film immersed in milk at different time points.
| Time (h) | L* | a* | b* | pH Value | Acidity (°T) |
|---|---|---|---|---|---|
| 0 | 51.33 ± 0.517 a | 9.22 ± 0.252 a | −4.13 ± 0.229 a | 6.78 | 16.35 |
| 6 | 54.10 ± 0.907 a | 9.38 ± 0.283 a | −3.64 ± 0.092 a,b | 6.62 | 16.36 |
| 7 | 55.03 ± 1.175 a | 10.04 ± 0.670 a,b | −3.38 ± 0.303 b | 6.54 | 18.03 |
| 8 | 53.82 ± 0.664 a | 10.48 ± 0.014 b,c | −3.08 ± 0.140 b | 6.32 | 20.55 |
| 9 | 50.92 ± 0.573 a | 11.21 ± 0.417 c | −1.01 ± 0.205 c | 5.98 | 27.26 |
| 10 | 54.11 ± 2.833 a | 11.35 ± 0.295 c | −0.82 ± 0.365 c | 5.49 | 35.23 |
a–c signify that different superscripts in the same parameters indicate significant differences (p < 0.05).