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