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Table 1 The variable factors and predicted and observed xylan recovery

From: Optimization of alkaline pretreatment and enzymatic hydrolysis for the extraction of xylooligosaccharide from rice husk

Std Run Factors Xylan recovery
X1: alkaline concentration (%w/v) X2: steaming time (min) X3: steaming temperature (°C) Observed value (%) Predicted value (%)
14 1 0 (12) 0 (30) 1.682 (133.64) 54.49 ± 0.61 52.66
13 2 0 (12) 0 (30) − 1.682 (66.36) 11.71 ± 0.39 12.36
9 3 − 1.682 (1.91) 0 (30) 0 (100) 5.19 ± 1.27 7.73
7 4 − 1 (6) 1 (45) 1 (120) 44.39 ± 3.42 44.60
15 5 0 (12) 0 (30) 0 (100) 16.24 ± 0.53 13.87
17 6 0 (12) 0 (30) 0 (100) 15.07 ± 2.24 13.87
6 7 1 (18) − 1 (15) 1 (120) 8.37 ± 0.42 13.94
16 8 0 (12) 0 (30) 0 (100) 13.67 ± 1.31 13.87
18 9 0 (12) 0 (30) 0 (100) 17.20 ± 4.30 13.87
1 10 − 1 (6) − 1 (15) − 1 (80) 8.39 ± 1.76 10.29
20 11 0 (12) 0 (30) 0 (100) 10.69 ± 0.01 13.87
10 12 1.682 (22.09) 0 (30) 0 (100) 14.89 ± 1.38 11.17
3 13 − 1 (6) 1 (45) − 1 (80) 3.87 ± 0.54 − 0.87
2 14 1 (18) − 1 (15) − 1 (80) 10.86 ± 4.08 11.49
11 15 0 (12) − 1.682 (4.77) 0 (100) 11.81 ± 0.62 7.97
12 16 0 (12) 1.682 (55.23) 0 (100) 24.14 ± 3.98 26.79
5 17 − 1 (6) − 1 (15) 1 (120) 23.42 ± 2.09 22.45
4 18 1 (18) 1 (45) − 1 (80) 9.92 ± 0.66 11.72
19 19 0 (12) 0 (30) 0 (100) 10.16 ± 1.19 13.87
8 20 1 (18) 1 (45) 1 (120) 48.55 ± 2.12 47.49