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Rapid ethanol production by Saccharomyces cerevisiae in a membrane bioreactor: The effect of adding high amounts of furfural
University of Borås, School of Engineering.
University of Borås, School of Engineering.ORCID iD: 0000-0003-4887-2433
2013 (English)Conference paper, Published paper (Other academic)
Sustainable development
The content falls within the scope of Sustainable Development
Abstract [en]

Robust polysiloxane-ACA capsules for prolonged ethanol production from wood hydrolyzate by Saccharomyces cerevisiae Päivi Ylitervo,a,b Carl Johan Franzén b and Mohammad J. Taherzadeh a a University of Borås, School of Engineering, Sweden b Chalmers University of Technology, Industrial Biotechnology, Sweden The recalcitrance of lignocellulose makes it difficult to hydrolyze and toxic inhibitors are formed during its decomposition. The formed inhibitors can severely affect the fermentability of the hydrolyzate. Encapsulating the fermenting yeast can be a potential option to make the cells more inhibitor and stress tolerant when compared with suspended yeast. In the encapsulation process the yeast is enclosed in a thin semi-permeable membrane surrounding the cells in the liquid core. To apply encapsulation for industrial applications the capsules need to be mechanically stable for long periods. Therefore, a new encapsulation method was developed were alginate-chitosan-alginate (ACA) capsules were treated with hydrolyzed 3-aminopropyltrietoxysilane (hAPTES) to reinforce capsules with polysiloxane (PS). PS-ACA-capsules treated with 1.5% and 3.0% hAPTES were very robust and only 0-1% capsules broke during the mechanical shear test performed after five batch cultivations. Of the untreated capsules, 25% burst within 6 h. The yeast in 3.0% hAPTES treated PS-ACA-capsules did not produce any ethanol during cultivations. However, capsules treated with 1.5% hAPTES were significantly stronger and showed similar ethanol production profile to untreated ACA-capsules cultivated in hydrolyzate. The produced PS-ACA-capsules were easily prepared and demonstrated high stability, reusability, and good ethanol production which are crucial features to make capsules the applicable at large scale for ethanol production.

Place, publisher, year, edition, pages
2013.
Keyword [en]
Membrane bioreactors, furfural, ethanol, yeast, Resursåtervinning
National Category
Engineering and Technology
Research subject
Resource Recovery
Identifiers
URN: urn:nbn:se:hb:diva-7141Local ID: 2320/13227OAI: oai:DiVA.org:hb-7141DiVA: diva2:887848
Conference
35th Symposium on Biotechnology for Fuels and Chemicals
Available from: 2015-12-22 Created: 2015-12-22 Last updated: 2016-10-07Bibliographically approved

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