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Table 4 Analysis of variance (ANOVA) for the pectinase activity model using BB design for the tested medium components

From: Bioprocess optimization for pectinase production using Aspergillus niger in a submerged cultivation system

Source

DF

Sequential SS

Adjusted SS

Adjusted MS

F value

p value

Main effects

4

9095.90

9095.91

2273.98

45.01

0.00

Pectin

1

2305.20

2305.18

2305.18

45.62

0.00

(NH4)2SO4

1

2877.70

2877.72

2877.72

56.96

0.00

K2HPO4

1

3835.80

3835.82

3835.82

75.92

0.00

MgSO4.5H2O

1

77.2000

77.1800

77.18

1.530

0.23

Residual error

31

1566.30

1566.27

50.52

  

Lack of fit

6

155.200

155.210

25.87

0.460

0.83

Pure error

25

1411.10

1411.06

56.44

  

Corrected total

35

10,662.2

    
  1. DF Degree of freedom, SS Sum of squares, MS Mean sum of squares