Table 2.

ANOVA of the response surface quadratic model for the yields of CPT and BA during the UARSE process.

Source a	DF	CPT				BA
		Sum of Square	Mean Square	F Value	p-Value b	Sum of Squares	Mean Square	F Value	p-Value b
Model	9	2.45	0.27	53.94	<0.0001	69.21	7.69	87.53	<0.0001
X1	1	6.80 × 10−2	6.80 × 10−2	13.38	0.0081	10.29	10.29	117.09	<0.0001
X2	1	5.50 × 10−2	5.50 × 10−2	10.82	0.0133	5.82	5.82	66.25	<0.0001
X3	1	0.47	0.47	92.63	<0.0001	22.23	22.23	253.02	<0.0001
X1X2	1	1.69 × 10−4	1.69 × 10−4	0.033	0.8600	1.50 × 10−2	1.50 × 10−2	0.17	0.6894
X1X3	1	2.97 × 10−3	2.97 × 10−3	0.59	0.4681	0.55	0.55	6.27	0.0407
X2X3	1	7.30 × 10−2	7.30 × 10−2	14.39	0.0068	1.60 × 10−2	1.60 × 10−2	0.19	0.6800
X12	1	1.15	1.15	226.92	<0.0001	15.38	15.38	175.07	<0.0001
X22	1	0.39	0.39	77.38	<0.0001	2.39	2.39	27.23	0.0012
X32	1	0.10	0.10	20.51	0.0027	9.76	9.76	111.14	<0.0001
Residual	7	3.50 × 10−2	5.05 × 10−3			0.62	8.80 × 10−2
Lack of Fit	3	2.70 × 10−2	8.89 × 10−3	4.11	0.1030	0.41	0.14	2.65	0.1847
R2		0.9858				0.9912

^a X₁ is the liquid–solid ratio (mL/g), X₂ the extraction time (min), and X₃ the microwave power (W). ^b p < 0.0001 is considered as significant.