Optimization of Hydrothermal and Diluted Acid Pretreatments of Tunisian Luffa cylindrica (L.) Fibers for 2G Bioethanol Production through the Cubic Central Composite Experimental Design CCD: Response Surface Methodology

Table 7

Desirability function of the variations Δ of the total and Δ reducing sugars concentrations for CCD studying the optimization of hydrothermal pretreatment of Luffa cylindrica biomass.

Parameters	Δ Total sugars concentration	Δ Reducing sugars concentration
Temperature (°C)	96	95
	()	()
Time (min)	60	60
	()	()
( Total sugars) (g/kg)	19.541	19.571
( Reducing sugars) (g/kg)	10.882	10.880
Desirability () (%)	51.70	52.39
Desirability () (%)	55.15	48.31
Desirability (%)	53.96	50.70