Plackett–Burman Combined with Box–Behnken to Optimize the Medium of Fermented Tremella Polysaccharide and Compare the Characteristics before and after Optimization

Table 2

Experimental level of the Plackett–Burman design.

Code	Factor	Units	Low level (−1)	High level (1)
A	Potato extract	%	20.00	25.00
B	Glucose	g/L	25.00	31.00
C	KH2PO4	g/L	3.00	3.75
D	MgSO4·7H2O	g/L	1.50	1.90
E	Vb1	mg/L	7.00	9.00
F	Peptone	g/L	2.50	3.10