Table 2.
Physical properties of black lemon Chenpi under different aging models and commercial Chenpi.
| Day | Group | L* | a* | b* | A420 | Water Activity | Moisture (%) | pH |
|---|---|---|---|---|---|---|---|---|
| 0 | FL | 35.28 ± 1.70 f | −6.82 ± 0.23 a | 14.37 ± 0.84 g | 0.884 ± 0.004 a | 0.974 ± 0.006 f | 78.31 ± 2.84 e | 4.86 ± 0.01 g |
| 15 | HAL | 31.32 ± 1.11 e | −1.54 ± 0.15 b | 12.28 ± 0.29 f | 1.094 ± 0.041 b | 0.221 ± 0.014 a | 10.25 ± 0.74 a | 4.74 ± 0.00 f |
| SCL | 19.40 ± 0.23 a | 2.38 ± 0.51 d | 3.11 ± 0.09 b | 2.395 ± 0.029 e | 0.551 ± 0.002 c | 17.99 ± 0.19 c | 4.26 ± 0.01 c | |
| HHL | 23.63 ± 0.46 b | 4.25 ± 0.49 e | 7.49 ± 0.33 d | 1.260 ± 0.002 c | 0.705 ± 0.013 e | 46.39 ± 0.44 d | 3.86 ± 0.00 a | |
| Commercial | FJ | 18.65 ± 0.23 a | 1.70 ± 0.12 c | 1.93 ± 0.14 a | 2.980 ± 0.011 f | 0.536 ± 0.006 bc | 16.18 ± 0.43 bc | 3.89 ± 0.02 b |
| CT | 26.84 ± 0.24 c | 8.48 ± 0.14 f | 8.95 ± 0.10 e | 1.124 ± 0.007 b | 0.532 ± 0.004 b | 14.58 ± 0.28 b | 4.51 ± 0.02 e | |
| XC | 29.45 ± 1.12 d | 2.74 ± 0.31 d | 3.81 ± 0.29 c | 1.362 ± 0.002 d | 0.608 ± 0.009 d | 17.29 ± 0.39 c | 4.40 ± 0.01 d |
Each value is expressed as mean ± standard deviation (n = 3); “a–g” means with different letters in the same column have significant difference (p < 0.05). L, F, HA, SC, and HH represent the lemon peel samples, fresh, hot-air drying, steam-drying cycle, and high temperature and humidity, respectively. FJ, CT, and XC were commercial Chenpi samples.