Table 2.

The Box-Behnken experimental design and corresponding response values

Run	A-ethanol concentration (%)	B-solvent to sample ratio (mL:g)	C-extraction time (min)	Total flavonoid content (mg/g)		DPPH inhibition (%)
				Actual	Predicted	Actual	Predicted
1	90%	10:1	45	14.32	14.42	43.19	43.22
2	70%	40:1	30	14.92	15.04	79.79	80.86
3	70%	10:1	30	15.29	15.26	62.98	61.86
4	70%	25:1	45	16.57	15.99	70.21	73.49
5	50%	25:1	60	11.40	11.47	77.23	76.14
6	70%	10:1	60	15.86	15.74	76.17	75.11
7	90%	40:1	45	14.67	14.61	51.91	49.76
8	70%	25:1	45	15.78	15.99	71.91	73.49
9	50%	10:1	45	10.42	10.47	57.87	60.02
10	50%	40:1	45	11.00	10.90	77.45	77.42
11	70%	40:1	60	16.56	16.59	78.94	80.06
12	90%	25:1	60	14.80	14.83	53.40	54.44
13	90%	25:1	30	14.35	14.28	46.6	47.69
14	70%	25:1	45	15.99	15.99	74.26	73.49
15	70%	25:1	45	15.91	15.99	72.34	73.49
16	70%	25:1	45	15.71	15.99	78.72	73.49
17	50%	25:1	30	10.02	9.99	71.49	70.45