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Table 1 The levels of the independent variables through CCD

From: Optimization of medium compositions to improve a novel glycoprotein production by Streptomyces kanasenisi ZX01

Factors Variables Levels
−1.682 −1 0 1 1.682
Soluble starch (g/L) X 1 5.0 7.0 10.0 13.0 15.0
Yeast extract (g/L) X 2 1.3 2.0 3.0 4.0 4.7
Inorganic salts (g/L) X 3 1.0 1.7 2.7 3.7 4.4
  1. x i = coded value of the variable X i
  2. x 1 = (soluble starch-10)/3; x 2 = (yeast extract-3)/1; x 3 = (inorganic salts-2.7)/1