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Table 2 ANOVA for Quadratic Model (Response 1:PHB content)

From: Production and optimization of bioplastic (Polyhydroxybutyrate) from Bacillus cereus strain SH-02 using response surface methodology

Source

Sum of Squares

Df

Mean Square

F-value

p-value

Model

2.334E+ 07

9

2.594E+ 06

188.15

<  0.0001a

A-glucose concentration

2.889E+ 06

1

2.889E+ 06

209.57

<  0.0001a

B-peptone concentration

2.282E+ 06

1

2.282E+ 06

165.57

<  0.0001a

C-pH

70,898.58

1

70,898.58

5.14

0.0467c

AB

1.579E+ 05

1

1.579E+ 05

11.46

0.0069b

AC

86,528.00

1

86,528.00

6.28

0.0312c

BC

4.456E+ 05

1

4.456E+ 05

32.32

0.0002a

A2

8.046E+ 06

1

8.046E+ 06

583.63

<  0.0001a

B2

4.619E+ 06

1

4.619E+ 06

335.10

<  0.0001a

C2

8.099E+ 06

1

8.099E+ 06

587.50

<  0.0001a

Residual

1.379E+ 05

10

13,785.55

  

Lack of Fit

1.128E+ 05

5

22,553.60

4.49

0.0623 NS

Pure Error

25,087.50

5

5017.50

  

Cor Total

2.348E+ 07

19

   

Std. Dev.

117.41

    

Mean

1540.75

    

C.V. %

7.62

    

PRESS

9.804E+ 05

    

R2

0.9941

    

Adjusted R2

0.9888

    

Predicted R2

0.9583

    

Adeq Precision

36.0784

    
  1. a, Highly significant; b, Significant; c, less significant; NS Not significant