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Table 4 Fermentation of coffee silverskin hydrolysates with C. beijerinckii CECT 508 under optimal conditions (33.9 °C, pH 5.59 and 7.55 g/L CaCO3) after 96 h

From: Biobutanol production from coffee silverskin

ABE fermentation metabolites
 Acetone (g/L) 4.14 ± 0.21
 Butanol (g/L) 7.02 ± 0.27
 Ethanol (g/L) 0.25 ± 0.01
 Acetic acid (g/L) 2.42 ± 0.05
 Butyric acid (g/L) 0.57 ± 0.14
Sugar consumption
 Total sugars (%) 76.5 ± 0.8
Yield and productivity
 Y B/S (g/g) 0.269 ± 0.008
 WB [g/(L·h)] 0.073 ± 0.003