Table 4 Coefficients of regression analysis for the investigated responses and independent effects of process parameters.

Intercept

161.73

90.99

86.02

200.16

77.56

95.49

195.26

58.82

93.48

A: Power (watt)

1.59^c

−8.24^a

0.72^b

4.97^a

0.5^c

−1.72^a

2.57^c

−2.14^a

−0.82^b

B: Time (min)

8.46^a

−2.30^b

−0.78^b

5.11^a

2.97^c

0.17^c

4.16^a

−0.30^c

−1.3^a

C: Sample to solvent

−11.66^a

−8.07^a

0.57^c

3.28^c

−3.61^c

−1.39^a

−2.30 ^c

0.61^c

−0.48^c

AB

13.23^a

−3.58^b

1.22^a

0.83^c

3.25^c

0.50^c

11.54^a

3.31^a

−1.34^b

AC

−3.17^c

−3.94^b

−1.98^a

3.95^c

8.71^a

−1.59^a

−0.39^c

2.91^a

−1.12^c

BC

−18.05^a

4.22^a

1.00^b

−6.5^a

0.87^c

0.9^c

10.95^a

1.89^c

0.89^c

A²

9.59^b

−4.72^a

2.39^a

−9.44^a

15.83^a

−2.66^a

−16.28^a

3.85^a

0.46^c

B²

6.75^c

3.86^b

4.15^a

−11.22^a

−1.35^c

−0.10^c

8.85^a

2.68^a

0.23^c

C²

17.28^a

−11.80^a

3.48^a

−5.26^b

17.53^a

−1.71^a

−8.45^a

−2.04^c

−2.54^a