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Table 3 The independent variables and their levels for the central composite experimental design

From: Statistical optimization of fibrinolytic enzyme production by Pseudoalteromonas sp. IND11 using cow dung substrate by response surface methodology

Variables

Symbol

Units

 

Coded levels

  
   

-α

−1

0

+1

+α

pH

A

 

6.32

7

8

9

9.68

Maltose

B

%

−0.01

0.25

0.5

1.0

1.26

NaH2PO4

C

%

−0.02

0.01

0.06

0.1

0.13