Table 3 Experimental level coding table.

From: Optimized biosynthesis and performance enhancement of γ-PGA from Bacillus licheniformis: a study on wettability, microstructure, and environmental performance

Influence factor

Mark

Encoding level

− 1

0

1

Temperature/℃

A

29

37

45

pH

B

2

7.5

13

Inoculum size (mL)

C

2.5

3

3.5

Amount of sodium glutamate added (g/L)

D

6

8

10

Amount of sodium citrate addition (g/L)

E

1.6

2.4

3.2

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