Table 2.
13C CP-MAS-NMR Chemical shifts of starting materials and regenerated CEL, CS and [CEL+CS] composite.
| Carbon chemical shifts (ppm) | |||||||
|---|---|---|---|---|---|---|---|
| C1 | C2 | C3 | C4 | C5 | C6 | CH3 | |
| Regenerated cellulose film | 104.6 | 74.1 | 74.1 | 83.9 | 74.1 | 62.0 | |
| Amorphous cellulose powder | 105.7 | 74.8 | 74.8 | 84.4 | 74.8 | 63.0 | |
| Microcrystalline cellulose powder | 104.9 | 72.1 | 74.6 | 83.7, 88.7 | 74.6 | 64.7, 62.3 | |
| Regenerated chitosan film | 104.7 | 61.0 | 75.4 | 83.6 | 75.4 | 61.0 | 22.7 |
| Chitosan powder | 104.9 | 60.1 | 74.7 | 84.0 | 74.7 | 60.1 | 23.4 |
| Regenerated cellulose+chitosan film | 104.5 | 56.4 | 75.5 | 83.9 | 75.5 | 61.5 | 23.0 |