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 1

The coded levels of the studied factors for both LC fibers hydrothermal and diluted acid pretreatments.

Pretreatment	Diluted acid pretreatment
	Hydrothermal pretreatments		Acid concentration (%)
Factors	Temperature (°C)	Reaction time (min)
Coded levels
−1	80	30	0.5
0	100	45	2.75
+1	120	60	5