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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