Table 3.
Instrumental color parameters of edible films
| Value | Day | Control | SHE | UV-C/SHE | ALG | UV-C/ALG |
|---|---|---|---|---|---|---|
| L* | 0 | 62.97 ± 1.13Ac | 63.68 ± 0.48Ab | 62.50 ± 2.31Ab | 63.70 ± 0.39Ad | 62.33 ± 1.23Ad |
| 3 | 60.99 ± 0.89Ab | 60.77 ± 0.26Aa | 59.55 ± 0.54Aa | 59.28 ± 1.05Ac | 59.98 ± 0.90Ac | |
| 7 | 59.20 ± 0.38Ba | 60.07 ± 0.76Ba | 60.12 ± 0.26Ba | 57.82 ± 0.45Ab | 58.06 ± 0.59Ab | |
| 11 | 58.55 ± 0.27Ba | 59.53 ± 0.75Ca | 59.80 ± 0.35Ca | 52.99 ± 0.15Aa | 52.92 ± 0.63Aa | |
| a* | 0 | 6.38 ± 0.04Ac | 7.00 ± 0.29Aba | 7.74 ± 1.02ABa | 8.02 ± 1.43Ba | 7.77 ± 0.20ABb |
| 3 | 5.71 ± 0.38Ac | 7.56 ± 0.66BCab | 7.14 ± 0.37Ba | 7.22 ± 0.11Ba | 8.12 ± 0.25Cc | |
| 7 | 4.06 ± 0.32Ab | 7.93 ± 0.04Db | 7.74 ± 0.24CDa | 7.55 ± 0.06BCa | 7.27 ± 0.12Ba | |
| 11 | 2.55 ± 0.53Aa | 7.67 ± 0.57Bab | 7.57 ± 0.08Ba | 7.28 ± 0.10Ba | 7.36 ± 0.10Ba | |
| b* | 0 | 24.29 ± 0.85Ad | 24.55 ± 0.95Aa | 24.87 ± 0.67Ab | 23.83 ± 1.08Ab | 23.71 ± 0.32Ab |
| 3 | 22.02 ± 0.69Ac | 24.69 ± 0.44Ba | 24.67 ± 0.96Bb | 24.22 ± 0.11Bb | 23.89 ± 1.13Bb | |
| 7 | 20.39 ± 0.36Ab | 24.18 ± 0.54Ca | 22.59 ± 0.55Ba | 21.59 ± 1.12Ba | 21.79 ± 0.23Ba | |
| 11 | 18.75 ± 0.42Aa | 24.65 ± 0.29Ca | 21.90 ± 0.49Ba | 21.14 ± 0.40Ba | 21.27 ± 0.53Ba | |
| ΔE* | 0 | – | – | – | – | – |
| 3 | 5.22 ± 2.94ABa | 5.13 ± 4.18ABa | 7.03 ± 4.00ABa | 11.55 ± 3.77Ba | 3.56 ± 1.93Aa | |
| 7 | 17.53 ± 0.51Cb | 7.28 ± 3.04Aa | 5.96 ± 2.07Aa | 20.43 ± 0.78Cb | 11.23 ± 2.74Ba | |
| 11 | 32.59 ± 2.89Bc | 9.14 ± 3.25Aa | 8.19 ± 0.53Aa | 61.27 ± 2.57Dc | 47.60 ± 5.99Cb |
ΔE* indicated the total color difference between the potatoes on day 0 and potatoes on other storage day x (3, 7, or 11)
Data are presented as means ± standard deviation of three replicates (n = 3)
Different uppercase letters (A–D) in the same row indicate significant differences (P ≤ 0.05) among the samples at the same storage time analyzed by Duncan's multiple range tests
Different lowercase letters (a–d) in the same column indicate significant differences (P ≤ 0.05) among the same sample with different storage times analyzed by Duncan's multiple range tests
Control: potatoes without both UV-C irradiation and coating treatments, SHE: shellac-coated potatoes, UV-C/SHE: potatoes coated with shellac after UV-C irradiation, ALG: alginate-coated potatoes, and UV-C/ALG: potatoes coated with alginate after UV-C irradiation