Table 1 Experimental range and levels of the independent variables through central composite design.

From: Enhancing the yield of Xenocoumacin 1 in Xenorhabdus nematophila YL001 by optimizing the fermentation process

Variables

Factors

Range and levels

− 1.682

− 1

0

1

1.682

\({X}_{1}\)

Maltose (g/L)

4.95

7

10

13

15.05

\({X}_{2}\)

Proteose peptone (g/L)

9.91

14

20

26

30.09

\({X}_{3}\)

K2HPO4 (g/L)

2.48

3.5

5

6.5

7.52

  1. Converting the coded values of variables to the actual dose of nutrients using the following formula: \({X}_{1}\)= (Maltose—10)/3; \({X}_{2}\)= (Proteose peptone—20)/6; \({X}_{3}\)= (K2HPO4—5)/1.5
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