Sample | Hunter’s parameter1 | Irradiation dose (kGy) | ||||
---|---|---|---|---|---|---|
0 | 1 | 4 | 7 | 10 | ||
DL | L* | 41.40 ± 1.25a2 | 40.71 ± 0.29ab | 39.79 ± 1.11bc | 39.05 ± 1.48n.s. | 38.62 ± 0.44n.s. |
a* | 0.16 ± 0.03n.s. | 0.20 ± 0.06n.s. | 0.22 ± 0.06bc | 0.30 ± 0.10ab | 0.31 ± 0.06a | |
b* | 3.16 ± 0.12n.s. | 3.10 ± 0.20n.s. | 3.00 ± 0.22ab | 2.75 ± 0.21bc | 2.70 ± 0.21c | |
∆E | 0.00e | 0.69d | 1.62c | 2.39b | 2.82a | |
RL | L* | 40.46 ± 1.57a | 39.54 ± 1.17ab | 39.14 ± 1.27ab | 38.57 ± 1.13b | 38.49 ± 0.64b |
a* | − 0.82 ± 0.19d | − 0.62 ± 0.08c | − 0.30 ± 0.14b | − 0.17 ± 0.07ab | − 0.04 ± 0.04a | |
b* | 3.41 ± 0.28a | 2.95 ± 0.29b | 2.48 ± 0.20c | 2.33 ± 0.30 cd | 2.01 ± 0.18d | |
∆E | 0.00e | 1.04d | 1.70c | 2.27b | 2.53a | |
SL | L* | 40.94 ± 0.50b | 42.07 ± 0.95n.s. | 42.21 ± 1.11n.s. | 42.31 ± 1.19n.s. | 42.58 ± 1.09a |
a* | − 2.75 ± 0.11b | − 2.56 ± 0.11n.s. | − 2.53 ± 0.14n.s. | − 2.51 ± 0.08n.s. | − 2.47 ± 0.18n.s. | |
b* | 6.81 ± 0.23n.s. | 6.61 ± 0.27n.s. | 6.54 ± 0.26n.s. | 6.50 ± 0.25n.s. | 6.46 ± 0.28n.s. | |
∆E | 0.00e | 1.17d | 1.32c | 1.43b | 1.70a |