Table 4. Central composite design for the scavenging activity factors and responses from peanut hull extracts

Run	X1 (%)	X2 (°C)	ABTS scavenging activity (%)	ABTS VCEAC (μg/mL)	DPPH scavenging activity (%)	DPPH VCEAC (μg/mL)
1	60	85	64.71	355.94	70.90	117.52
2	60	85	75.00	412.54	79.30	131.37
3	100	25	20.93	115.13	28.92	48.33
4	80	55	47.29	260.12	65.59	108.77
5	100	85	52.06	286.36	59.70	99.06
6	60	25	27.56	151.60	36.76	61.25
7	80	55	46.54	256.00	64.02	106.18
8	80	55	46.40	255.23	64.46	106.91
9	100	25	21.69	119.31	26.86	44.93
10	60	25	28.92	159.08	37.25	62.06
11	100	85	55.59	305.78	59.50	98.73
12	80	55	47.32	260.29	65.99	109.43
13	80	55	47.64	262.05	66.12	109.65
14	80	55	46.48	255.67	66.01	109.46
15	100	55	33.58	184.71	49.31	81.94
16	80	25	32.83	180.58	45.20	75.16
17	60	55	39.76	218.70	54.51	90.51
18	80	85	67.21	369.69	81.10	134.34

Where X₁, methanol concentration; X₂, temperature.