Table 2. Experimental points of the central composite design and the experimental data of total yield, total dietary fiber (TDF), water-soluble dietary fiber (SDF) and water-insoluble dietary fiber (IDF) of Opuntia hymifusa stem under enzyme hydrolysis condition
| Exp. Nos | Conditions | Total yield (%) | TDF content (%) | SDF content >(%) | IDF content (%) |
| Enzyme concentration (%) | Reaction time (h) |
| 1 | 2.0 (1)1) | 4 (1) | 46.88 | 32.01 | 31.02 | 0.98 |
| 2 | 2.0 (1) | 2 (-1) | 52.66 | 35.60 | 33.70 | 1.90 |
| 3 | 1.0 (-1) | 4 (1) | 40.23 | 29.02 | 27.25 | 1.77 |
| 4 | 1.0 (-1) | 2 (-1) | 45.38 | 42.69 | 40.68 | 2.01 |
| 5 | 1.5 (0) | 3 (0) | 44.57 | 33.86 | 32.70 | 1.16 |
| 6 | 1.5 (0) | 3 (0) | 44.80 | 33.74 | 32.40 | 1.34 |
| 7 | 1.5 (0) | 3 (0) | 44.52 | 33.79 | 32.49 | 1.30 |
| 8 | 1.5 (0) | 3 (0) | 44.63 | 33.77 | 32.40 | 1.37 |
| 9 | 1.5 (0) | 3 (0) | 44.90 | 33.63 | 32.32 | 1.31 |
| 10 | 2.5 (2) | 3 (0) | 53.24 | 30.20 | 28.77 | 1.43 |
| 11 | 0.5 (-2) | 3 (0) | 39.94 | 36.97 | 35.90 | 1.07 |
| 12 | 1.5 (0) | 5 (2) | 43.29 | 31.98 | 29.87 | 1.11 |
| 13 | 1.5 (0) | 1 (-2) | 45.38 | 43.82 | 40.02 | 3.80 |
Coded value.