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Bioresources and Bioprocessing

Table 4 Analysis of variance for the regression equation of the lignin extraction yield

From: Optimization of ethanol-extracted lignin from palm fiber by response surface methodology and preparation of activated carbon fiber for dehumidification

Source

Sum of squares

Degree of freedom

Mean square

F-value

P > F

 

Model

2003.61

14

143.11

9.56

 < 0.0001

Significant

X1

12.81

1

12.81

0.86

0.3705

 

X2

311.10

1

311.10

20.79

0.0004

 

X3

180.19

1

180.19

12.04

0.0038

 

X4

12.00

1

12.00

0.80

0.3857

 

X1 X2

153.76

1

153.76

10.27

0.0064

 

X1 X3

16.81

1

16.81

1.12

0.3072

 

X1 X4

125.44

1

125.44

8.38

0.0118

 

X2 X3

6.00

1

6.00

0.40

0.5367

 

X2 X4

1.21

1

1.21

0.081

0.7803

 

X3 X4

2.25

1

2.25

0.15

0.7040

 

X12

489.55

1

489.55

32.71

 < 0.0001

 

X22

420.34

1

420.34

28.09

0.0001

 

X32

460.41

1

460.41

30.77

 < 0.0001

 

X42

481.14

1

481.14

32.15

 < 0.0001

Significant

Residual

209.51

14

14.96

   

Lack of fit

207.35

10

20.73

38.40

0.0016

 

Pure error

2.16

4

0.54

   

Cor total

2213.11

28

    
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