Table 4.
Colour parameters of Cistanche slices under different ultrasound conditions.
| Sample | L* | a* | b* | ∆E* |
|---|---|---|---|---|
| Fresh | 61.26 ± 2.15 a | 3.89 ± 0.46 h | 24.6 ± 0.64 h | - |
| un-sonicated | 46.47 ± 3.47 cdefgh | 10.48 ± 0.31 a | 31.07 ± 0.29 a | 17.44 ± 3.65 a |
| US 25 min, 40 kHz, 180 W | 46.97 ± 1.27 cde | 9.21 ± 0.76 b | 30.84 ± 0.35 ab | 16.48 ± 1.52 abc |
| US 35 min, 40 kHz, 180 W | 47.23 ± 1.58 cd | 8.49 ± 0.30 bcde | 29.86 ± 0.88 abcd | 15.65 ± 1.83 abcde |
| US 45 min, 40 kHz, 180 W | 52.05 ± 0.66 b | 5.5 ± 0.21 h | 27.66 ± 0.71 g | 9.84 ± 0.99 gh |
| US 35 min, 20 kHz, 180 W | 46.52 ± 1.93 cdefg | 8.54 ± 0.51 bcd | 29.17 ± 1.43 def | 16.12 ± 2.45 abcd |
| US 35 min, 60 kHz, 180 W | 46.92 ± 3.06 cdef | 8.37 ± 0.28 bcdef | 26.35 ± 0.47 h | 15.13 ± 3.10 abcdef |
| US 35 min, 40 kHz, 150 W | 46.34 ± 2.87 cdefgh | 9.17 ± 0.77 bc | 30.81 ± 0.95 abc | 16.94 ± 3.12 abcdef |
| US 35 min, 40 kHz, 210 W | 49.13 ± 2.11 bc | 8.31 ± 0.28 bcdefg | 29.28 ± 0.34 de | 13.73 ± 2.15 abcdefg |
Note: Data are expressed as means ± standard deviation of triplicate samples. The letters in the same column reveal significant differences (* p < 0.05) according to the Duncan test.