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Table 3 Factor values for independent variables and response variable (experimental and predicted) of screening experiments to optimize fermentation conditions

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

Run C/N T (°C) t (h) P—experimental (mg/L h) P—predicted (mg/L h)
1 − 1 − 1 0 5.1 5.3
2 1 − 1 0 5.5 4.6
3 − 1 1 0 4.4 5.3
4 1 1 0 4.0 3.9
5 − 1 0 − 1 9.7 9.9
6 1 0 − 1 4.0 5.3
7 − 1 0 1 3.0 1.8
8 1 0 1 4.5 4.4
9 0 − 1 − 1 10.3 10.0
10 0 1 − 1 9.5 8.5
11 0 − 1 1 3.2 4.3
12 0 1 1 4.8 5.2
13 0 0 0 6.9 6.6
14 0 0 0 6.3 6.6
15 0 0 0 6.5 6.6
  1. C/N carbon/nitrogen ratio; T fermentation temperature; t fermentation time; P PHB productivity