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. 2015 Jul 1;46(3):911–920. doi: 10.1590/S1517-838246320140918

Table 2. Range of variation of the independent factors used in the central composite design.

Variable Code Level of variation

−1.68 −1 0 1 1.68
JAP (g/L) A 53.2 60.0 70.0 80.0 86.8
Peptone (g/L) B 9.9 15.0 22.5 30.0 35.1
Solution volume (mL) C 33.2 40.0 50.0 60.0 66.8