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Table 1 Independent variables with their respective coded values and levels used in the Box–Behnken design

From: Vinasse: from a residue to a high added value biopolymer

Culture media composition
Level C (g/L) N (g/L) Ph (g/L)
High (+ 1) 8 0.4 1.2
Central (0) 6 0.25 1.05
Low (− 1) 4 0.1 0.9
Fermentations conditions
Level C/N T (°C) t (h)
High (+ 1) 40 37 72
Central (0) 30 33.5 48
Low (− 1) 20 30 24
  1. C carbon; N nitrogen; Ph phosphorous; C/N carbon/nitrogen ratio; T fermentation temperature; t fermentation time