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Journal of Analytical Science and Technology

Table 5 Sequential model sum of squares and ANOVA for response surface linear model for pectin extraction

From: Optimization of oil and pectin extraction from orange (Citrus sinensis) peels: a response surface approach

Source

Sum of squares

Df

Mean square

F value

Prob > F

 

Mean

7800.46

1

7800.46

–

–

 

Linear

410.57

3

136.86

27.05

< 0.0001

Suggested

2FI

7.87

3

2.62

0.47

0.7107

 

Quadratic

4.50

3

1.50

0.22

0.8812

 

Cubic

65.90

4

16.47

36.63

0.0002

Aliased

Residual

2.70

6

0.45

–

–

 

Total

8292.00

20

414.60

–

–

 

Model

410.57

3

136.86

27.05

< 0.0001

 

A

68.97

1

68.97

13.65

0.0020

 

B

243.98

1

243.98

48.21

< 0.0001

 

C

97.61

1

97.61

19.29

0.0005

 

Residual

80.97

16

5.06

–

–

 

Lack of fit

78.75

11

7.16

16.17

< 0.0033

 

Pure error

2.21

5

0.44

–

–

 

Correlation total

491.54

19

–

–

–

 
  1. Values > 0.05 are not significant
  2. A represents extraction temperature, B represents extraction time, C represents extraction pH, df degree of freedom
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