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Table 1 Process parameters in factorial design: coded and actual values

From: Production of a biodiesel-like biofuel without glycerol generation, by using Novozym 435, an immobilized Candida antarctica lipase

Variables Unit Levels
−1 0 1
Temperature °C 20 30 40
Oil/ethanol ratio (v/v) ml/ml 12/1,75 - 12/3.5
Alkaline environment μl (NaOH 10 N) 8 (12.5) 10 (5) 12 (50)