Table 1.
Yield, color and physico–chemical properties of mantis shrimp (Oratosquilla nepa) shell, CT and CS obtained by different deacetylation times.
| Parameters | Shell | CT | CS−2 | CS−3 | CS−4 |
|---|---|---|---|---|---|
| Yield (%) | - | 20.48 ± 0.72 a | 15.79 ± 0.19 b | 15.62 ± 0.25 b | 14.13 ± 0.09 c |
| Appearance |
|
|
|
|
|
| Color | |||||
| L* | 77.95 ± 0.07 d | 78.03 ± 0.40 d | 78.60 ± 0.24 c | 79.79 ± 0.48 b | 81.86 ± 0.09 a |
| a* | 5.25 ± 0.08 b | 9.69 ± 0.42 a | 5.63 ± 0.49 b | 3.03 ± 0.30 c | 3.45 ± 0.20 c |
| b* | 18.02 ± 0.34 a | 10.56 ± 0.20 d | 14.53 ± 0.47 b | 14.68 ± 0.68 b | 12.38 ± 0.42 c |
| Whiteness (%) | 71.04 ± 0.16 d | 73.76 ± 0.27 c | 73.53 ± 0.21 c | 74.83 ± 0.34 b | 77.76 ± 0.18 a |
| Properties | |||||
| DDA (%) | - | - | 73.56 ± 0.09 c | 74.83 ± 0.18 b | 75.56 ± 0.01 a |
| [η] (dL/g) | - | - | 3.58 ± 0.09 a | 3.44 ± 0.34 a | 2.97 ± 0.16 b |
| Mν (×106 Da) | - | - | 1.44 ± 0.05 a | 1.37 ± 0.18 a | 1.12 ± 0.08 b |
Values are mean ± SD (n = 3). Different lowercase superscripts within the same row indicate significant differences (p < 0.05). CT: chitin; CS−2, CS−3 and CS−4: chitosan obtained by deacetylation times of 2, 3, and 4 h, respectively.