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Table 2 The level code for each variable in the Plackett–Burman design and corresponding production response of 2,3-BD

From: A newly isolated Bacillus licheniformisstrain thermophilically produces 2,3-butanediol, a platform and fuel bio-chemical

Run

Variable levels

2,3-BD

 

X 1

X 2

X 3

X 4

X 5

X 6

(g/L)

1

1

−1

1

−1

−1

−1

30.47 ± 0.06

2

1

1

−1

1

−1

−1

32.16 ± 0.64

3

−1

1

1

−1

1

−1

28.63 ± 0.01

4

1

−1

1

1

−1

1

31.31 ± 0.67

5

1

1

−1

1

1

−1

29.55 ± 0.68

6

1

1

1

−1

1

1

29.55 ± 0.28

7

−1

1

1

1

−1

1

30.28 ± 0.61

8

−1

−1

1

1

1

−1

26.67 ± 0.97

9

−1

−1

−1

1

1

1

19.31 ± 0.65

10

1

−1

−1

−1

1

1

22.31 ± 0.49

11

−1

1

−1

−1

−1

1

26.82 ± 0.64

12

−1

−1

−1

−1

−1

−1

18.90 ± 0.59