Table 3. Central composite design for the extraction of luteolin and antioxidant activities from peanut hull

Run	X1 (%)	X2 (°C)	Luteolin (mg/100 g)	TPC (mg GAE/100 g)	TFC (mg QE/100 g
1	60	85	138.59	1,441.75	1,296.43
2	60	85	140.87	1,573.79	1,396.43
3	100	25	78.73	628.22	235.81
4	80	55	144.63	1,291.96	865.16
5	100	85	152.57	1,346.60	832.14
6	60	25	68.04	713.27	535.81
7	80	55	152.07	1,237.76	878.07
8	80	55	145.18	1,270.34	867.81
9	100	25	77.12	627.29	500.32
10	60	25	69.54	725.42	558.39
11	100	85	155.92	1,468.93	1,510.71
12	80	55	168.08	1,266.78	870.04
13	80	55	151.29	1,244.07	867.41
14	80	55	153.74	1,265.84	867.49
15	100	55	118.27	1,024.67	697.42
16	80	25	103.49	777.76	668.07
17	60	55	100.03	1,125.61	742.58
18	80	85	173.95	2,049.51	1,817.86

Where X₁, methanol concentration; X₂, temperature.