Optimization of Variables for Aqueous Extraction of Gum from Grewia mollis Powder

Table 1

Matrices of the face-centered central design for the independent variables (experimental and coded levels).

Number run	Factors				Responses variables
	Time (H)	pH	Temperature (°C)	Ratio	Viscosity (Pa·s)	Gum yield
1	(+1) 3	(−1) 4	(−1) 25	(+1) 80	0.4339	0.6226
2	(−1) 1	(−1) 4	(+1) 85	(+1) 80	0.2551	0.8174
3	(−1) 1	(+1) 10	(+1) 85	(−1) 10	0	0
4	(−1) 1	(−1) 4	(−1) 25	(−1) 10	0	0
5	(0) 2	(−1) 4	(0) 55	(0) 45	0.3119	0.3248
6	(0) 2	(+1) 10	(0) 55	(0) 45	0.3481	0.2438
7	(0) 2	(0) 7	(0) 55	(0) 45	0.8363	0.231
8	(0) 2	(0) 7	(+1) 85	(0) 45	0.3085	0.227
9	(0) 2	(0) 7	(0) 55	(0) 45	1.023	0.945
10	(0) 2	(0) 7	(0) 55	(0) 45	1.1	0.409
11	(+1) 3	(+1) 10	(−1) 25	(+1) 80	0.543	0.5436
12	(+1) 3	(+1) 10	(−1) 25	(−1) 10	0	0
13	(0) 2	(0) 7	(0) 55	(0) 45	0.834	0.285
14	(+1) 3	(+1) 10	(+1) 85	(−1) 10	0	0
15	(−1) 1	(+1) 10	(+1) 85	(+1) 80	0.3931	0.2006
16	(+1) 3	(+1) 10	(+1) 85	(+1) 80	0.3107	0.3014
17	(+1) 3	(−1) 4	(+1) 85	(−1) 10	0	0
18	(0) 2	(0) 7	(0) 55	(−1) 10	0	0
19	(−1) 1	(−1) 10	(−1) 25	(−1) 10	0	0
20	(+1) 3	(0) 7	(0) 55	(0) 45	0.6979	0.177
21	(−1) 1	(0) 7	(−1) 25	(0) 45	1.214	0.285
22	(−1) 1	(+1) 10	(−1) 25	(+1) 80	0.8223	0.1608
23	(0) 2	(0) 7	(0) 55	(+1) 80	0.4639	0.092
24	(−1) 1	(−1) 10	(−1) 25	(+1) 80	0.4084	0.3346
25	(+1) 3	(−1) 4	(−1) 25	(−1) 10	0	0
26	(0) 2	(0) 7	(0) 55	(0) 45	0.5126	0.187
27	(−1) 1	(−1) 10	(+1) 85	(−1) 10	0	0
28	(0) 2	(0) 7	(−1) 25	(0) 45	0.4045	0.272
29	(+1) 3	(+1) 10	(+1) 85	(+1) 80	0.2885	0.5906
30	(0) 2	(0) 7	(0) 55	(0) 45	1.333	0.343