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Table 2 Composition of coffee silverskin hydrolysates after each pretreatment step, expressed in g/L

From: Biobutanol production from coffee silverskin

  Autohydrolysis Autohydrolysis + enzymatic hydrolysis
Cellobiose 0.56 ± 0.25 0.62 ± 0.07
Glucose 0.51 ± 0.10 21.83 ± 0.81
Xylose 1.73 ± 0.28 9.44 ± 1.71
Rhamnose 2.65 ± 0.33 1.01 ± 1.00
Arabinose 1.11 ± 0.25 1.49 ± 0.56
Total sugars 6.54 ± 0.80 34.39 ± 2.61
Formic acid 1.76 ± 0.26 1.64 ± 0.20
Acetic acid 1.32 ± 0.14 1.94 ± 0.05
Levulinic acid 0.00 ± 0.00 0.00 ± 0.00
5-HMF 0.09 ± 0.02 0.07 ± 0.01
Furfural 0.08 ± 0.05 0.09 ± 0.01
Phenolic compounds 1.51 ± 0.00 1.52 ± 0.03
Caffeine 0.91 ± 0.07 0.82 ± 0.04
  1. Means and standard deviations are provided. Autohydrolysis conditions: 170 °C, 20 min, 20% solid biomass. Xylose concentration is in fact a sum of xylose, galactose and mannose concentrations