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Table 1 Plackett–Burman design (8 factors and 2 levels) for identifying main factors in HA production

From: Enhancement of herbicolin A production by integrated fermentation optimization and strain engineering in Pantoea agglomerans ZJU23

Factor

A

Corn steep liquor

B

Glycerol

C

CaCl2

D

Threonine

E

Time

F

Temperature

G

Initial pH

H

Inoculation

Response

HA (mg/L)

Std

Run

9

1

− 1

− 1

− 1

1

1

1

− 1

1

169.70

7

2

− 1

1

1

1

− 1

1

1

− 1

89.40

1

3

1

− 1

1

− 1

− 1

− 1

1

1

106.89

11

4

− 1

1

− 1

− 1

− 1

1

1

1

88.59

3

5

− 1

1

1

− 1

1

− 1

− 1

− 1

106.01

8

6

− 1

− 1

1

1

1

− 1

1

1

96.79

4

7

1

− 1

1

1

− 1

1

− 1

− 1

158.49

12

8

− 1

− 1

− 1

− 1

− 1

− 1

− 1

− 1

108.30

5

9

1

1

− 1

1

1

− 1

1

− 1

108.50

2

10

1

1

− 1

1

− 1

− 1

− 1

1

141.67

6

11

1

1

1

− 1

1

1

− 1

1

183.36

10

12

1

− 1

− 1

− 1

1

1

1

− 1

118.97