Table 3 Analysis of variance for the fitted quadratic polynomial model of hydroxyl radical scavenging activity of polysaccharides

Model

1154.38

9

128.26

38.82

<0.0001

X₁

641.89

1

641.89

191.75

<0.0001

X₂

36.51

1

36.51

10.91

0.0131

X₃

306.16

1

306.16

91.46

<0.0001

X₁ X₂

100.50

1

100.50

30.02

0.0009

X₁ X₃

3.33

1

3.33

0.99

0.3518

X₂ X₃

0.20

1

0.20

0.060

0.8128

X₁²

1.78

1

1.78

0.53

0.4897

X₂²

52.24

1

52.24

15.61

0.0055

X₃²

10.35

1

10.35

3.09

0.1222

Residual

23.43

7

3.35

Lack of Fit

16.86

3

5.62

3.42

0.1328

Pure Error

6.57

4

1.64

Cor Total

1177.82

16

R²=0.9801 R²_adj=0.9545 CV=3.79%