Enzymatic Extraction, Purification, and Characterization of Polysaccharides from Penthorum chinense Pursh: Natural Antioxidant and Anti-Inflammatory

Table 2

The Placket-Burman design variables (in coded levels) with PCPP yield as response.

Run	Variable levels						Yield ()
	X1	X2	X3	X4	X5	X6
	(°C)	(min)	(mL/g)	(W)	(%)
1	-1	-1	-1	-1	-1	-1	0.97
2	-1	1	1	-1	1	-1	2.81
3	-1	1	1	1	-1	1	1.55
4	1	1	-1	1	-1	-1	1.35
5	1	-1	1	-1	-1	-1	1.91
6	1	1	-1	1	1	-1	3.02
7	1	1	1	-1	1	1	4.23
8	-1	-1	-1	1	1	1	2.61
9	-1	1	-1	-1	-1	1	0.64
10	1	-1	-1	-1	1	1	2.75
11	-1	-1	1	1	1	-1	4.23
12	1	-1	1	1	-1	1	2.17
Effect	0.4353	-0.1729	0.9265	0.2737	1.8454	-0.0567
Coefficient	0.2177	-0.0865	0.4633	0.1368	0.9227	-0.0283
t-Value	1.70	-0.68	3.62	1.07	7.22	-0.22
p-value	0.149	0.529	0.015	0.333	0.001	0.833

Press = 5.65, R² = 0.9332, and adj-R² = 0.8530. Identified variables with a significant effect on the response (p<0.05).