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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