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Table 4 The variable factors and predicted and observed xylooligosaccharide yield

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

Std. Run Factors Amount of xylooligosaccharide (mg/mL)
X1: enzyme concentration (mg/g xylan) X2: incubation time (h) X3: xylan concentration (%w/v) Observed value Predicted value
16 1 0 (3.75) 0 (9) 0 (3) 12.98 ± 0.01 13.19
12 2 0 (3.75) 1 (16) 1 (5) 17.32 ± 0.79 17.32
13 3 0 (3.75) 0 (9) 0 (3) 12.96 ± 0.65 13.19
7 4 − 1 (1.25) 0 (9) 1 (5) 16.94 ± 0.32 16.95
9 5 0 (3.75) − 1 (2) − 1 (1) 13.97 ± 0.14 13.97
17 6 0 (3.75) 0 (9) 0 (3) 13.18 ± 0.47 13.19
8 7 1 (6.25) 0 (9) 1 (5) 17.35 ± 0.31 17.41
15 8 0 (3.75) 0 (9) 0 (3) 13.42 ± 0.47 13.19
3 9 − 1 (1.25) 1 (16) 0 (3) 13.75 ± 0.14 13.75
5 10 − 1 (1.25) 0 (9) − 1 (1) 14.25 ± 0.31 14.19
1 11 − 1 (1.25) − 1 (2) 0 (3) 13.05 ± 0.47 13.11
2 12 1 (6.25) − 1 (2) 0 (3) 13.61 ± 0.14 13.62
11 13 0 (3.75) − 1 (2) 1 (5) 17.29 ± 0.22 17.23
14 14 0 (3.75) 0 (9) 0 (3) 13.44 ± 0.24 13.19
6 15 1 (6.25) 0 (9) − 1 (1) 13.88 ± 0.51 13.87
10 16 0 (3.75) 1 (16) − 1 (1) 14.20 ± 0.03 14.27
4 17 1 (6.25) 1 (16) 0 (3) 13.44 ± 0.16 13.38