Table 3 Statistical analysis of variance (ANOVA) for the selected factorial design to optimization of xylanase production by Aspergillus oryzae

Model

0.7474

17

0.0440

0.6456

24.62

< 0.0001

Significant

A-Substrate concentration

0.1201

1

0.1201

0.0613

67.23

< 0.0001

B-Yeast extract

0.2145

1

0.2145

0.0819

120.13

< 0.0001

C-(NH4)2SO4

0.3160

1

0.3160

0.0994

176.97

< 0.0001

AD

0.0066

1

0.0066

0.0144

3.70

0.0749

AE

0.0045

1

0.0045

−0.0119

2.53

0.1342

CD

0.0112

1

0.0112

−0.0187

6.30

0.0250

CE

0.0060

1

0.0060

0.0137

3.39

0.0870

DE

0.0045

1

0.0045

−0.0119

2.53

0.1342

ABD

0.0091

1

0.0091

−0.0169

5.10

0.0404

ACD

0.0055

1

0.0055

−0.0131

3.09

0.1008

ACE

0.0055

1

0.0055

0.0131

3.09

0.1008

BCD

0.0112

1

0.0112

0.0187

6.30

0.0250

BCE

0.0040

1

0.0040

0.0113

2.27

0.1543

BDE

0.0045

1

0.0045

0.0119

2.53

0.1342

ABCD

0.0066

1

0.0066

0.0144

3.70

0.0749

BCDE

0.0045

1

0.0045

0.0119

2.53

0.1342

ABCDE

0.0128

1

0.0128

−0.0200

7.17

0.0180

Residual

0.0250

14

0.0018

Cor total

0.7724

31