Biotechnology for Biofuels and Bioproducts

Table 2 Response surface analysis of AFEX pretreatment factors

From: Conversion of lignocellulosic agave residues into liquid biofuels using an AFEX™-based biorefinery

Term	Agave tequilana				Agave salmiana
	Bagasse^a,b		Leaf fibers^c		Bagasse^b		Leaf fibers^c
	Coef.	p	Coef.	p	Coef.	p	Coef.	p
β ₀	− 161.7	0.000	90.8	0.000	− 108	0.000	74.1	0.000
β ₁	0.511	0.041	na		na		na
β ₂	2.849	0.004	− 0.328	0.027	2.633	0.035	− 0.070	0.012
β ₃	11.10	0.000	17.79	0.000	19.01	0.000	22.24	0.000
β ₄	130.5	0.002	− 77.7	0.016	61.90	0.000	− 43.0	0.000
β ₁₁	− 0.0061	0.010	na		na		na
β ₂₂	− 0.0114	0.000	na		− 0.0103	0.001	na
β ₃₃	–	–	na		− 0.712	0.012	na
β ₂₃	0.2404	0.002	–	–	–	–	− 0.097	0.010
β ₂₄	− 0.582	0.028	0.828	0.014	− 0.450	0.031	0.446	0.015
β ₃₄	− 59.50	0.000	− 11.15	0.000	− 14.77	0.000	− 15.22	0.000

Regression coefficients (β_i): 0 = constant; 1 = time^a (min); 2 = temperature (°C); 3 = NH₃ (g/g DM), 4 = H₂O (g/g DM)
na, not applicable
^aTime was a variable on A. tequilana bagasse only, and was held at 30 min on the other feedstocks
^bSecond order model (with quadratic terms) on both species bagasse, from Box–Behnken DoE
^cFirst order model (linear) on both species leaves, from full-factorial DoE

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