Table 2.

ANOVA for response surface models of all independent variables

Factor	Catechin		Myricetin		Quercetin		DPPH
	Mean	p-value	Mean	p-value	Mean	p-value	Mean	p-value
	Square	Prob > F	Square	Prob > F	Square	Prob > F	Square	Prob > F
Model	0.0225	< 0.0001**	0.0226	< 0.0001**	0.0225	< 0.0001**	244.3220	0.0001**
Linear term
X1	0.0142	0.0060**	0.0145	0.0061**	0.0142	0.0060**	372.0941	0.0006**
X2	0.0041	0.0873	0.0040	0.0954	0.0041	0.0873	40.4155	0.1258
X3	0.0012	0.3259	0.0011	0.3466	0.0012	0.3259	19.1805	0.2749
Quadratic
X1 2	0.1637	< 0.0001**	0.1640	< 0.0001**	0.1637	< 0.0001**	1599.0550	< 0.0001**
X2 2	0.0005	0.5309	0.0005	0.5285	0.0005	0.5309	2.2023	0.7028
X3 2	0.0006	0.4902	0.0006	0.4883	0.0006	0.4902	8.9640	0.4472
Interactions
X1X2	0.0034	0.1168	0.0035	0.1126	0.0034	0.1168	13.7813	0.3502
X1X3	0.0002	0.7122	0.0002	0.6853	0.0002	0.7122	0.4513	0.8624
X2X3	0.0002	0.6527	0.0002	0.6853	0.0002	0.6527	3.2513	0.6436

Independent variable X₁: Temperature, X₂: Mthanol concentration, X₃: Ultrasonic power; **Significant at P < 0.01.