Table 5.

Regression coefficients of the second-order polynomial response models.

Source	DPPH		Total Phenols
	F-Ratio	p-Value	F-Ratio	p-Value
[X1]	64.02	0.004	64.88	0.000
[X2]	85.71	0.002	31.38	0.001
X1 X1	7.97	0.066	1.09	0.336
X1 X2	78.92	0.003	0.84	0.394
X2 X2	26.51	0.014	0.45	0.528
Lack-of-fit	5.81	0.091	0.96	0.514
R2aj	87.12		89.52
SEE	0.06		0.10