Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 538363
Title Coffee silverskin as a renewable resource to produce butanol and isopropanol
Author(s) Procentese, Alessandra; Raganati, Francesca; Navarini, Luciano; Olivieri, Giuseppe; Russo, Maria Elena; Marzoccchella, Antonio
Source In: Chemical Engineering Transactions / Bardone, Enrico, Marzochella, Antonio, Keshavarz, Tajalli, Italian Association of Chemical Engineering - AIDIC (Chemical Engineering Transactions ) - ISBN 9788895608563 - p. 139 - 144.
Department(s) Bioprocess Engineering
Publication type Peer reviewed book chapter
Publication year 2018

Coffee is the second largest traded commodity after oil and large amounts of by-products are generated in the coffee industry every year. In particular, coffee silverskin (CS) and spent coffee grounds (SCG) are the main coffee industry residues. CS is about 4.2% (w/w) of coffee beans and the valorisation of this waste through the biorefinery approach may boost the circular economy development. In the present contribution, CS was pretreated with one of the mainly investigated biomass pretreatment reported in literature: alkaline hydrolysis in NaOH solutions. After enzymatic hydrolysis of the pretreated CS, the obtained sugars were used as carbon source to produce butanol and isopropanol by Clostridium beijerinckii DSM 6423. Moreover, fermentation tests were also carried out with synthetic media to investigate the effects of the alkaline pretreatment on the fermentation process. When pretreated CS was used as feedstock, the largest yields were 0.16 and 0.31 gsolvent/gsugars isopropanol and butanol, respectively. The reported results foster further studies regarding the reuse of CS for solvents production through fermentation processes.

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