Table 1 Box–Behnken design and the response values for yield and hydroxyl radical scavenging activity of polysaccharides
Run | X1: Ultrasonic Power (W) | X2: Extraction time (min) | X3: Extraction temperature (°C) | Yield of polysaccharides (%) | Hydroxyl radical scavenging activity of polysaccharides (%) | ||
|---|---|---|---|---|---|---|---|
Actual values | Predicted values | Actual values | Predicted values | ||||
1 | 120 (+1) | 15 (+1) | 50 (0) | 4.44 | 4.53 | 35.61 | 35.66 |
2 | 80 (−1) | 5 (−1) | 50 (0) | 3.26 | 3.17 | 49.36 | 49.31 |
3 | 100 (0) | 10 (0) | 50 (0) | 3.98 | 4.03 | 50.14 | 50.37 |
4 | 100 (0) | 10 (0) | 50 (0) | 3.96 | 4.03 | 48.35 | 50.37 |
5 | 100 (0) | 10 (0) | 50 (0) | 4.06 | 4.03 | 51.65 | 50.37 |
6 | 100 (0) | 5 (−1) | 60 (+1) | 3.56 | 3.59 | 38.43 | 36.73 |
7 | 120 (+1) | 5 (−1) | 50 (0) | 3.80 | 3.82 | 39.86 | 41.42 |
8 | 80 (−1) | 10 (0) | 40 (−1) | 2.96 | 3.01 | 65.65 | 65.51 |
9 | 100 (0) | 10 (0) | 50 (0) | 4.12 | 4.03 | 51.26 | 50.37 |
10 | 100 (0) | 15 (+1) | 60 (+1) | 4.16 | 4.12 | 41.65 | 41.46 |
11 | 120 (+1) | 10 (0) | 40 (−1) | 3.82 | 3.76 | 47.52 | 45.77 |
12 | 80 (−1) | 15 (+1) | 50 (0) | 3.58 | 3.56 | 65.16 | 63.60 |
13 | 100 (0) | 10 (0) | 50 (0) | 4.05 | 4.03 | 50.45 | 50.37 |
14 | 100 (0) | 15 (+1) | 40 (−1) | 3.68 | 3.65 | 51.68 | 53.38 |
15 | 100 (0) | 5 (−1) | 40 (−1) | 3.04 | 3.08 | 49.36 | 49.56 |
16 | 80 (−1) | 10 (0) | 60 (+1) | 3.40 | 3.45 | 49.56 | 51.31 |
17 | 120 (+1) | 10 (0) | 60 (+1) | 4.36 | 4.31 | 35.08 | 35.22 |