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 |