Biobutanol production from coffee silverskin View Full Text


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Article Info

DATE

2018-12

AUTHORS

María Hijosa-Valsero, Jerson Garita-Cambronero, Ana I. Paniagua-García, Rebeca Díez-Antolínez

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). More... »

PAGES

154

References to SciGraph publications

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  • Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1186/s12934-018-1002-z

    DOI

    http://dx.doi.org/10.1186/s12934-018-1002-z

    DIMENSIONS

    https://app.dimensions.ai/details/publication/pub.1107280453

    PUBMED

    https://www.ncbi.nlm.nih.gov/pubmed/30261894


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    238 Instituto de Recursos Naturales (IRENA), Universidad de León, Avenida de Portugal 42, 24071, León, Spain
    239 rdf:type schema:Organization
     




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