Table 6 The results of constant, linear regression coefficients of variables for the microwave-assisted extraction of astaxanthin with different solvents from F. merguiensis shrimp wastes

From: Green astaxanthin extraction using microwave and ultrasound pretreatments

Factor

Organic solvent

Vegetable oil

Ionic microemulsion

Coefficient estimate

df

Standard error

95% CI low

95% CI high

Coefficient estimate

df

Standard error

95% CI low

95% CI high

Coefficient estimate

df

Standard error

95% CI low

95% CI high

Total carotenoid content

Intercept

49.53

1

2.91

43.36

55.71

34.39

1

1.23

31.79

36.99

69.40

1

2.14

64.86

73.95

A.Ratio

-1.39

1

4.12

−10.12

7.34

−12.87

1

1.73

−16.55

−9.19

−9.04

1

3.03

−15.47

−2.62

B.Power

−1.55

1

4.12

−10.28

7.18

−0.7303

1

1.73

−4.41

2.95

−3.14

1

3.03

−9.57

3.29

C.Time

−0.8664

1

4.12

−9.60

7.86

0.0354

1

1.73

−3.64

3.71

4.11

1

3.03

−2.32

10.53

0.0184

0.7753

0.4245

Adjusted R²

−0.1657

0.7332

0.3166

Predicted R²

−0.5588

0.6872

−0.0446

Astaxanthin concentration

Intercept

40.09

1

2.46

34.87

45.30

30.38

1

1.00

28.25

32.50

30.38

1

1.85

61.37

65.30

A.Ratio

−3.91

1

3.48

−11.29

3.47

−11.25

1

1.42

−14.25

−8.25

−11.25

1

2.62

−13.84

−8.29

B.Power

1.35

1

3.48

−6.02

8.73

0.0947

1

1.42

−2.91

3.10

0.0947

1

2.62

−8.69

−3.13

C.Time

2.62

1

3.48

−4.76

10.00

0.6644

1

1.42

−2.34

3.67

0.6644

1

2.62

−2.08

3.48

 

0.1101

 

0.7982

 

0.4519

Adjusted R²

 

−0.0568

 

0.7603

 

0.3491

Predicted R²

 

−0.4242

 

0.7124

 

−0.0487

Astaxanthin recovery yield

Intercept

81.51

1

2.17

76.92

86.11

88.25

1

1.06

86.02

90.47

93.73

1

1.13

91.36

96.10

A.Ratio

−8.03

1

3.06

−14.53

−1.54

-

-

-

-

-

-

-

-

-

-

B.Power

4.13

1

3.06

−2.36

10.63

-

-

-

-

-

-

-

-

-

-

C.Time

8.70

1

3.06

2.20

15.20

-

-

-

-

-

-

-

-

-

-

0.5115

-

-

Adjusted R²

0.4199

-

-

Predicted R²

0.1450

-

-