Table 2.

The experimental design using the PB method for screening of medium components

Run	Variables								Pyruvic acid yield (g/L)
	A	B	C	D	E	F	G	H
1	1	−1	1	−1	−1	−1	1	1	32.5
2	1	1	−1	1	−1	−1	−1	1	36.3
3	−1	1	1	−1	1	−1	−1	−1	36.9
4	1	−1	1	1	−1	1	−1	−1	35.0
5	1	1	−1	1	1	−1	1	−1	38.5
6	1	1	1	−1	1	1	−1	1	40.2
7	−1	1	1	1	−1	1	1	−1	36.8
8	−1	−1	1	1	1	−1	1	1	33.4
9	−1	−1	−1	1	1	1	−1	1	32.6
10	1	−1	−1	−1	1	1	1	−1	35.3
11	−1	1	−1	−1	−1	1	1	1	34.1
12	−1	−1	−1	−1	−1	−1	−1	−1	31.8