Table 2. Polynomial equations calculated by RSM TY, TAC, TPC, and antioxidant activities of eggplant powder extracts using MAE

Response variables	Regression equation	R2	F-ratio of independent variables1)
			X1	X2	X3
TY	-1.175625+0.064500X1+0.002725X2+0.013292X3-0.000475X12-0.000040000X2X1-0.000006000X22+0.000021667X3X2-0.000080556X32	0.8877**2)	8.29**	0.90	3.91*
TAC	-73.545938+2.006813X1+0.001650X2+0.123167X3-0.014375X12+0.000213X2X1-0.000068500X22+0.000654X3X1+0.000261X3X2-0.000922X32	0.8723*	4.40*	3.39*	2.95
TPC	-52.498033+1.502360X1+0.058477X2+1.182419X3-0.013384X12+0.000460X2X1-0.000386X22-0.000117X3X1+0.000273X3X2-0.006301X32	0.9782***	29.11***	8.39*	22.79***
DPPH RSA	-171.080906+4.7024X1-0.087725X2+1.127479X3-0.035429X12+0.001387X2X1-0.00003165X22+0.001108X3X1+0.000517X3X2-0.006736X32	0.9018**	4.82**	1.54	7.08**
ABTS RSA	-168.251562+5.146687X1-0.074500X2+0.722583X3-0.041125X12+0.002133X2X1-0.000248X22+0.002963X3X1+0.000587X3X2-0.005131X32	0.9711***	26.53***	11.77***	15.64***
FRAP activity	-138.286250+4.524625X1+0.000100X2+0.995833X3-0.035125X12+0.000655X2X1-0.000126X22+0.000050000X3X1+0.000703X3X2-0.005378X32	0.9424***	13.05***	4.46*	7.52**

¹⁾X₁: ethanol concentration, X₂: microwave power, X₃: extraction time.
²⁾*Significant at p<0.1; **significant at p<0.05; ***significant at p<0.01.