Valorization of Glycine max (Soybean) Seed Waste: Optimization of the Microwave-Assisted Extraction (MAE) and Characterization of Polyphenols from Soybean Meal Using Response Surface Methodology (RSM)

Table 2

Experimental design in coded and real variables.

Trials	Matrix of coded variables			Matrix of real variables
	X1	X2	X3	Solvent/meal ratio (ml/g)	Power (W)	Time (min)
1	−1	−1	−1	70	150	2
2	1	−1	−1	100	150	2
3	−1	1	−1	70	240	2
4	1	1	−1	100	240	2
5	−1	−1	1	70	150	8
6	1	−1	1	100	150	8
7	−1	1	1	70	240	8
8	1	1	1	100	240	8
9	−1.68	0	0	59.77	195	5
10	1.68	0	0	110.22	195	5
11	0	−1.68	0	85	119.31	5
12	0	1.68	0	85	270.68	5
13	0	0	−1.68	85	195	0.04
14	0	0	1.68	85	195	10.04
15	0	0	0	85	195	5
16	0	0	0	85	195	5
17	0	0	0	85	195	5
18	0	0	0	85	195	5
19	0	0	0	85	195	5
20	0	0	0	85	195	5

Bold values are replicates of the center points.