Table 1.

Experimental design of response surface analysis and its experimental values.

Run	X1 (Concentration of Ethanol, %)	X2 (Solvent/Material Ratio, mL/g)	X3 (Extraction Time, min)	Y (TEAC Value, µmol Trolox/g DW)
1	70	50	7	1082.39
2	83.64	40	15	952.35
3	50	40	15	1063.53
4	50	40	15	1086.78
5	30	30	23	977.83
6	50	23.18	15	951.72
7	50	40	15	1051.91
8	70	30	7	960.39
9	50	56.82	15	1092.03
10	30	50	23	1000.05
11	50	40	28.45	1009.28
12	50	40	15	1040.28
13	50	40	15	1071.28
14	70	50	23	1029.11
15	50	40	15	1055.78
16	70	30	23	948.77
17	30	30	7	919.71
18	50	40	1.55	1063.53
19	16.36	40	15	900.78
20	30	50	7	990.36