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Table 2 FFD design matrix for variables with coded values along with the experimental and predicted responses

From: Production of rhamnolipid biosurfactants in solid-state fermentation: process optimization and characterization studies

A: pH

B: Glycerol (%)

C: MgSO4 (gr)

D: Humidity (%)

E: Temperature (°C)

F: Particle size (nm)

G: Inoculum size (mL)

H: NaNO3 (gr)

Rhamnolipid (g/kg of substrate)

Experimental

Predicted

9.00 (1)

6.00 (1)

0.40 (1)

80.00 (1)

35.00 (1)

1.50 (1)

1.50 (1)

8.00 (1)

18.04

18.94

5.00 ( − 1)

2.00 ( − 1)

0.40 (1)

80.00 (1)

35.00 (1)

0.50 ( − 1)

0.50 ( − 1)

8.00 (1)

14.36

14.37

5.00 ( − 1)

2.00 ( − 1)

0.40 (1)

50.00 ( − 1)

35.00 (1)

1.50 (1)

1.50 (1)

4.00 ( − 1)

14.37

14.21

9.00 (1)

2.00 ( − 1)

0.40 (1)

50.00 ( − 1)

25.00 ( − 1)

1.50 (1)

0.50 ( − 1)

8.00 (1)

7.87

7.20

5.00 ( − 1)

6.00 (1)

0.40 (1)

50.00 (1)

25.00 ( − 1)

1.50 (1)

0.50 ( − 1)

4.00 ( − 1)

11.93

11.93

9.00 (1)

6.00 (1)

0.20 ( − 1)

80.00 (1)

25.00 ( − 1)

0.50 ( − 1)

0.50 ( − 1)

8.00 (1)

12.67

11.92

5.00 ( − 1)

6.00 (1)

0.40 (1)

50.00 ( − 1)

25.00 ( − 1)

0.50 ( − 1)

1.50 (1)

8.00 (1)

12.31

11.77

9.00 (1)

2.00 ( − 1)

0.20 ( − 1)

50.00 ( − 1)

35.00 (1)

0.50 ( − 1)

1.50 (1)

8.00 (1)

14.81

14.21

5.00 ( − 1)

2.00 ( − 1)

0.20 ( − 1)

80.00 (1)

25.00 ( − 1)

1.50 (1)

1.50 (1)

8.00 (1)

13.3

14.04

5.00 ( − 1)

2.00 ( − 1)

0.20 ( − 1)

50.00 ( − 1)

25.00 ( − 1)

0.50 ( − 1)

0.50 ( − 1)

4.00 ( − 1)

5.66

7.20

5.00 ( − 1)

6.00 (1)

0.20 ( − 1)

50.00 ( − 1)

35.00 (1)

1.50 (1)

0.50 ( − 1)

8.00 (1)

10.67

12.10

9.00 (1)

6.00 (1)

0.40 (1)

50.00 ( − 1)

35.00 (1)

0.50 ( − 1)

0.50 ( − 1)

4.00 ( − 1)

12.15

12.10

5.00 ( − 1)

6.00 (1)

0.20 ( − 1)

80.00 (1)

35.00 (1)

0.50 ( − 1)

1.50 (1)

4.00 ( − 1)

18.97

18.94

9.00 (1)

2.00 ( − 1)

0.20 ( − 1)

80.00 (1)

35.00 (1)

1.50 (1)

0.50 ( − 1)

4.00 ( − 1)

15.91

14.37

9.00 (1)

2.00 ( − 1)

0.40 (1)

80.00 (1)

25.00 ( − 1)

0.50 ( − 1)

1.50 (1)

4.00 ( − 1)

13.4

14.04

9.00 (1)

6.00 (1)

0.20 ( − 1)

50.00 ( − 1)

25.00 ( − 1)

1.50 (1)

1.50 (1)

4.00 ( − 1)

12.76

11.77