Optimization of Phenolic Compound Extraction from Chinese Moringa oleifera Leaves and Antioxidant Activities

Table 2

Response surface experimental design and results.

No.	Ethanol concentration (%)	Solid-liquid ratio (g/mL)	Extraction temperature (°C)	Extraction time (min)	TF (%)	TP (%)
	X1	X2	X3	X4
1	70	1 : 30	60	60	4.63	2.33
2	70	1 : 30	50	45	4.88	2.49
3	60	1 : 30	40	45	4.38	2.45
4	80	1 : 30	50	60	4.37	2.23
5	60	1 : 30	50	60	4.48	2.38
6	70	1 : 20	50	30	4.59	2.25
7	70	1 : 20	40	45	4.53	2.42
8	70	1 : 30	50	45	4.79	2.47
9	60	1 : 30	50	30	4.42	2.35
10	70	1 : 30	40	30	4.71	2.27
11	70	1 : 30	50	45	4.82	2.45
12	70	1 : 30	40	60	4.67	2.40
13	70	1 : 30	50	45	4.83	2.41
14	70	1 : 20	60	45	4.50	2.26
15	60	1 : 20	50	45	4.36	2.31
16	70	1 : 20	50	60	4.55	2.32
17	70	1 : 40	60	45	4.52	2.42
18	70	1 : 40	40	45	4.57	2.37
19	60	1 : 30	60	45	4.41	2.25
20	60	1 : 40	50	45	4.27	2.28
21	70	1 : 30	50	45	4.85	2.47
22	70	1 : 30	60	30	4.68	2.29
23	70	1 : 40	50	60	4.61	2.36
24	70	1 : 40	50	30	4.66	2.44
25	80	1 : 30	50	30	4.43	2.25
26	80	1 : 30	40	45	4.32	2.21
27	80	1 : 30	60	45	4.22	2.34
28	80	1 : 20	50	45	4.15	2.12
29	80	1 : 40	50	45	4.31	2.38