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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