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Table 5 ANOVA for the response surface quadratic model

From: Production of rhamnolipid biosurfactants in solid-state fermentation: process optimization and characterization studies

Source of variation

Sum of square

df

Mean square

F

P-value

FI

Model

125.42

14

8.96

52.80

 < 0.0001

Significant

A

3.77

1

3.77

22.21

0.0003

 

B

5.37

1

5.37

31.63

 < 0.0001

 

C

11.06

1

11.06

65.16

 < 0.0001

 

D

0.014

1

0.014

0.080

0.7814

 

AB

1.4E−003

1

1.4E−003

8.288E−003

0.9287

 

AC

4.25

1

4.25

25.07

0.0002

 

AD

3.75

1

3.75

22.12

0.0003

 

BC

0.64

1

0.64

3.75

0.0719

 

BD

16.59

1

16.59

97.75

 < 0.0001

 

CD

0.032

1

0.032

0.19

0.6727

 

A2

50.44

1

50.44

297.30

 < 0.0001

 

B2

14.26

1

14.26

84.07

 < 0.0001

 

C2

2.72

1

2.72

16.03

0.0012

 

D2

35.17

1

35.17

207.29

 < 0.0001

 

Residual

2.535

15

0.17

   

Lack of fit

2.01

10

0.20

0.58

0.2499

Not Significant

Pure error

0.53

5

0.11

   

Cor total

108.73

29

    
  1. R-square = 0.9801; Adj. R-square = 0.9615; Predicted R-square = 0.9034
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