Biobutanol production from coffee silverskin
Abstract Background Coffee silverskin, a by-product from coffee roasting industries, was evaluated as a feedstock for biobutanol production by acetone–butanol–ethanol fermentation. This lignocellulosic biomass contained approximately 30% total carbohydrates and 30% lignin. Coffee silverskin was subj...
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doaj-bbca5b8d0d2242958a54a4220a17e5c22020-11-25T00:50:45ZengBMCMicrobial Cell Factories1475-28592018-09-011711910.1186/s12934-018-1002-zBiobutanol production from coffee silverskinMaría Hijosa-Valsero0Jerson Garita-Cambronero1Ana I. Paniagua-García2Rebeca Díez-Antolínez3Centro de Biocombustibles y Bioproductos, Instituto Tecnológico Agrario de Castilla y León (ITACyL)Centro de Biocombustibles y Bioproductos, Instituto Tecnológico Agrario de Castilla y León (ITACyL)Centro de Biocombustibles y Bioproductos, Instituto Tecnológico Agrario de Castilla y León (ITACyL)Centro de Biocombustibles y Bioproductos, Instituto Tecnológico Agrario de Castilla y León (ITACyL)Abstract Background Coffee silverskin, a by-product from coffee roasting industries, was evaluated as a feedstock for biobutanol production by acetone–butanol–ethanol fermentation. This lignocellulosic biomass contained approximately 30% total carbohydrates and 30% lignin. Coffee silverskin was subjected to autohydrolysis at 170 °C during 20 min, with a biomass-to-solvent ratio of 20%, and a subsequent enzymatic hydrolysis with commercial enzymes in order to release simple sugars. The fermentability of the hydrolysate was assessed with four solventogenic strains from the genus Clostridium. In addition, fermentation conditions were optimised via response surface methodology to improve butanol concentration in the final broth. Results The coffee silverskin hydrolysate contained 34.39 ± 2.61 g/L total sugars, which represents a sugar recovery of 34 ± 3%. It was verified that this hydrolysate was fermentable without the need of any detoxification method and that C. beijerinckii CECT 508 was the most efficient strain for butanol production, attaining final values of 4.14 ± 0.21 g/L acetone, 7.02 ± 0.27 g/L butanol and 0.25 ± 0.01 g/L ethanol, consuming 76.5 ± 0.8% sugars and reaching a butanol yield of 0.269 ± 0.008 gB/gS under optimal conditions. Conclusions Coffee silverskin could be an adequate feedstock for butanol production in biorefineries. When working with complex matrices like lignocellulosic biomass, it is essential to select an adequate bacterial strain and to optimize its fermentation conditions (such as pH, temperature or CaCO3 concentration).http://link.springer.com/article/10.1186/s12934-018-1002-zCoffee silverskinLignocellulosic wastesPretreatmentButanolABE fermentationBiorefinery |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
María Hijosa-Valsero Jerson Garita-Cambronero Ana I. Paniagua-García Rebeca Díez-Antolínez |
spellingShingle |
María Hijosa-Valsero Jerson Garita-Cambronero Ana I. Paniagua-García Rebeca Díez-Antolínez Biobutanol production from coffee silverskin Microbial Cell Factories Coffee silverskin Lignocellulosic wastes Pretreatment Butanol ABE fermentation Biorefinery |
author_facet |
María Hijosa-Valsero Jerson Garita-Cambronero Ana I. Paniagua-García Rebeca Díez-Antolínez |
author_sort |
María Hijosa-Valsero |
title |
Biobutanol production from coffee silverskin |
title_short |
Biobutanol production from coffee silverskin |
title_full |
Biobutanol production from coffee silverskin |
title_fullStr |
Biobutanol production from coffee silverskin |
title_full_unstemmed |
Biobutanol production from coffee silverskin |
title_sort |
biobutanol production from coffee silverskin |
publisher |
BMC |
series |
Microbial Cell Factories |
issn |
1475-2859 |
publishDate |
2018-09-01 |
description |
Abstract Background Coffee silverskin, a by-product from coffee roasting industries, was evaluated as a feedstock for biobutanol production by acetone–butanol–ethanol fermentation. This lignocellulosic biomass contained approximately 30% total carbohydrates and 30% lignin. Coffee silverskin was subjected to autohydrolysis at 170 °C during 20 min, with a biomass-to-solvent ratio of 20%, and a subsequent enzymatic hydrolysis with commercial enzymes in order to release simple sugars. The fermentability of the hydrolysate was assessed with four solventogenic strains from the genus Clostridium. In addition, fermentation conditions were optimised via response surface methodology to improve butanol concentration in the final broth. Results The coffee silverskin hydrolysate contained 34.39 ± 2.61 g/L total sugars, which represents a sugar recovery of 34 ± 3%. It was verified that this hydrolysate was fermentable without the need of any detoxification method and that C. beijerinckii CECT 508 was the most efficient strain for butanol production, attaining final values of 4.14 ± 0.21 g/L acetone, 7.02 ± 0.27 g/L butanol and 0.25 ± 0.01 g/L ethanol, consuming 76.5 ± 0.8% sugars and reaching a butanol yield of 0.269 ± 0.008 gB/gS under optimal conditions. Conclusions Coffee silverskin could be an adequate feedstock for butanol production in biorefineries. When working with complex matrices like lignocellulosic biomass, it is essential to select an adequate bacterial strain and to optimize its fermentation conditions (such as pH, temperature or CaCO3 concentration). |
topic |
Coffee silverskin Lignocellulosic wastes Pretreatment Butanol ABE fermentation Biorefinery |
url |
http://link.springer.com/article/10.1186/s12934-018-1002-z |
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