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Bioresources and Bioprocessing

Table 4 ANOVA and coefficient values for CCD

From: Application of methanol and sweet potato vine hydrolysate as enhancers of citric acid production by Aspergillus niger

Source

Sum of squares

df

F value

p value Prob > F

 

Model

3.26

20

5.11

<0.0001

Significant

A-initial pH

0.5

1

15.49

0.0005

 

B-fermentation temperature

0.52

1

16.32

0.0004

 

C-inoculum quantity

0.047

1

1.47

0.2351

 

D-fermentation period

0.11

1

3.57

0.0690

 

E-SVH

0.02

1

0.62

0.4391

 

AB

0.13

1

4.16

0.0506

 

AC

0.018

1

0.57

0.4579

 

AD

0.3

1

9.39

0.0047

 

AE

0.15

1

4.72

0.0382

 

BC

1.32E−04

1

4.13E−03

0.9492

 

BD

0.093

1

2.9

0.0995

 

BE

0.079

1

2.47

0.1270

 

CD

2.20E−03

1

0.069

0.7952

 

CE

0.036

1

1.13

0.2975

 

DE

0.083

1

2.6

0.1177

 

A 2

0.64

1

20.1

0.0001

 

B 2

0.19

1

5.84

0.0222

 

C 2

0.03

1

0.93

0.3434

 

D 2

0.44

1

13.71

0.0009

 

E 2

0.019

1

0.6

0.4461

 

Residual

0.93

29

   

Lack of fit

0.81

22

2.13

0.1544

Not significant

Pure error

0.12

7

   

Cor total

4.19

49

   
  1. Coefficient of determination (R 2) = 0.7788, CV = 7.31%. The “Pred R-Squared” of 0.2324 was not as close to the “Adj R-Squared” of 0.6262 as one might normally expect. The “Adeq Precision” value of 10.000 indicated an adequate signal
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