Table 1. Box–Behnken Design of Three Variables with Polysaccharide Yields.

	parameters and levels
run	X1: temperature (°C)	X2: time (min)	X3: pressure (MPa)	polysaccharide yield (%)
1	120	12.5	1.5	16.12
2	140	12.5	1.0	20.11
3	120	20.0	1.0	19.28
4	140	12.5	1.0	19.32
5	140	20.0	1.5	17.24
6	160	20.0	1.0	17.16
7	140	20.0	0.5	9.63
8	160	12.5	1.5	15.34
9	140	5.0	1.5	12.88
10	120	12.5	0.5	11.08
11	120	5.0	1.0	17.95
12	140	5.0	0.5	9.89
13	160	12.5	0.5	7.49
14	160	5.0	1.0	17.56
15	140	12.5	1.0	20.30