Table 7.
Color response values for the SPS/SPP CA 1%, SPS/SPP CA 1.5%, and SPS/SPP CA 2% films at pH 1–10.
| SPS/SPS CA 1% | ||||
| pH Value | L | a | b | ΔE |
| pH 1 | 29.75 ± 0.50 c | 46.75 ± 0.56 a | 43.56 ± 1.65 bc | 85.26 ± 0.86 d |
| pH 2 | 20.87 ± 0.79 e | 35.05 ± 1.52 d | 44.9 ± 0.97 b | 86.89 ± 0.52 cd |
| pH 3 | 32.31 ± 1.44 b | 43.64 ± 1.64 b | 37.72 ± 0.49 d | 79.03 ± 0.38 f |
| pH 4 | 38.64 ± 1.11 a | 35.79 ± 1.02 cd | 21.46 ± 0.59 h | 63.72 ± 0.35 i |
| pH 5 | 33.98 ± 0.21 b | 29.02 ± 0.93 e | 26.85 ± 0.66 g | 65.96 ± 0.80 h |
| pH 6 | 28.73 ± 0.67 c | 29.86 ± 0.24 e | 34.31 ± 0.62 e | 73.63 ± 0.91 g |
| pH 7 | 33.47 ± 3.08 b | 23.86 ± 1.2 f | 31.43 ± 2.05 f | 66.24 ± 3.88 h |
| pH 8 | 25.92 ± 1.48 d | 33.88 ± 1.92 d | 42.71 ± 1.95 bc | 81.48 ± 0.65 e |
| pH 9 | 19.92 ± 0.71 e | 37.49 ± 2.41 c | 43.95 ± 0.16 b | 88.17 ± 0.46 bc |
| pH 10 | 11.84 ± 1.80 g | 6.21 ± 2.10 g | 41.21 ± 2.30 c | 85.92 ± 0.67 d |
| pH 11 | 14.27 ± 1.41 f | 3.2 ± 0.12 h | 57.42 ± 2.54 a | 92.37 ± 0.44 a |
| pH 12 | 8.44 ± 1.37 h | 2.02 ± 0.28 h | 42.36 ± 2.22 bc | 89.26 ± 0.21 b |
| SPS/SPS CA 1.5% | ||||
| pH Value | L | a | b | ΔE |
| pH 1 | 30.02 ± 0.73 d | 46.65 ± 0.79 a | 47.70 ± 0.10 bc | 87.12 ± 0.04 b |
| pH 2 | 22.79 ± 0.46 g | 42.90 ± 0.25 b | 53.39 ± 0.47 a | 93.28 ± 0.53 a |
| pH 3 | 26.24 ± 0.46 f | 41.78 ± 0.14 c | 46.35 ± 0.86 c | 86.57 ± 0.84 b |
| pH 4 | 30.34 ± 0.26 cd | 37.6 ± 0.18 d | 34.93 ± 0.16 e | 76.08 ± 0.15 cd |
| pH 5 | 32.58 ± 0.61 b | 28.08 ± 0.33 f | 29.27 ± 0.08 f | 67.66 ± 0.31 e |
| pH 6 | 28.1 ± 1.26 e | 30.75 ± 0.29 e | 35.87 ± 0.23 e | 75.20 ± 0.98 d |
| pH 7 | 35.10 ± 0.42 a | 20.66 ± 0.19 h | 30.28 ± 0.16 f | 63.30 ± 0.22 f |
| pH 8 | 31.57 ± 1.77 bc | 26.2 ± 1.35 g | 28.64 ± 4.36 f | 67.54 ± 3.76 e |
| pH 9 | 31.62 ± 0.54 bc | 17.38 ± 0.33 i | 21.91 ± 1.25 h | 62.11 ± 0.81 f |
| pH 10 | 19.84 ± 0.14 h | −2 ± 0.04 l | 38.69 ± 0.17 d | 77.47 ± 0.09 c |
| pH 11 | 16.39 ± 0.82 i | 2.17 ± 0.03 k | 48.90 ± 0.65 b | 85.67 ± 0.41 b |
| pH 12 | 30.81 ± 0.83 cd | 5.49 ± 0.53 j | 24.49 ± 0.38 g | 61.64 ± 0.83 f |
| SPS/SPS CA 2% | ||||
| pH Value | L | a | b | ΔE |
| pH 1 | 28.56 ± 0.25 b | 45.79 ± 0.30 a | 48.54 ± 0.10 a | 88.10 ± 0.09 a |
| pH 2 | 31.45 ± 0.86 a | 46.51 ± 0.18 a | 46.03 ± 1.50 b | 85.23 ± 1.31 b |
| pH 3 | 29.23 ± 1.08 b | 42.17 ± 1.10 b | 42.97 ± 0.22 d | 82.93 ± 0.27 c |
| pH 4 | 26.17 ± 0.19 c | 38.02 ± 0.08 c | 41.96 ± 0.03 d | 82.67 ± 0.10 cd |
| pH 5 | 29.17 ± 1.15 b | 28.34 ± 0.46 e | 30.52 ± 0.23 g | 71.07 ± 0.86 f |
| pH 6 | 26.23 ± 0.30 c | 28.77 ± 0.56 e | 37.06 ± 0.65 f | 76.47 ± 0.23 e |
| pH 7 | 22.34 ± 1.40 d | 33.32 ± 1.76 d | 37.17 ± 0.22 f | 81.42 ± 1.73 d |
| pH 8 | 20.97 ± 0.72 e | 37.64 ± 2.79 c | 46.53 ± 0.48 b | 88.69 ± 1.33 a |
| pH 9 | 20.81 ± 0.59 e | 39.26 ± 0.16 c | 46.26 ± 0.12 b | 89.35 ± 0.36 a |
| pH 10 | 17.63 ± 0.84 f | −4.64 ± 0.07 h | 44.22 ± 0.65 c | 82.26 ± 0.43 cd |
| pH 11 | 14.42 ± 0.35 g | 3.48 ± 0.21 g | 38.92 ± 0.80 e | 82.39 ± 0.59 cd |
| pH 12 | 26.49 ± 0.79 c | 12.23 ± 0.77 f | 26.26 ± 0.71 h | 67.14 ± 0.50 g |
Different superscript lowercase letters within the same row indicate significant differences by the Fisher’s test (p < 0.05).