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Table 2 Factorial level

From: Microbial synthesis of poly-γ-glutamic acid (γ-PGA) with fulvic acid powder, the waste from yeast molasses fermentation

Factorial level

A—glucose g/L

B—NaNO3g/L

C—KH2 PO4g/L

D—FA power g/L

E—l-glutamate g/L

F—citrate sodium g/L

1

60

12

0.5

20

5

5

2

70

16

0.7

30

10

10

3

80

20

0.9

40

20

20