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Mechanically robust polysiloxane: ACA capsules for prolonged ethanol production
University of Borås, School of Engineering.
University of Borås, School of Engineering.ORCID iD: 0000-0003-4887-2433
2013 (English)In: Journal of chemical technology and biotechnology (1986), ISSN 0268-2575, E-ISSN 1097-4660, Vol. 88, no 6, 1080-1088 p.Article in journal (Refereed) Published
Sustainable development
The content falls within the scope of Sustainable Development
Abstract [en]

Fermentation using encapsulated yeast leads to more robust ethanol production from lignocellulose hydrolyzates. Encapsulated yeast is much more tolerant to inhibitors present in hydrolyzates, and fermentation is faster due to increased total cell density. For industrial applications, capsules must be made robust enough to endure long periods and numerous cultivations without breaking. Liquid core alginate–chitosan–alginate (ACA) capsules containing Saccharomyces cerevisiae were produced by the liquid-droplet-forming method and treated with hydrolyzed 3-aminopropyltrietoxysilane (hAPTES) forming very glossy capsules. Capsules produced with 3.0% hAPTES showed the best mechanical robustness but no ethanol could be produced in dilute-acid spruce hydrolyzate using these capsules. Untreated ACA capsules gave the highest ethanol production but demonstrated poor mechanical robustness. 25% of the ACA capsules ruptured within 6 h in the shear test. Capsules treated with 1.5% hAPTES were significantly stronger, since only 0–2% of these capsules broke. Moreover, the ethanol production in the fifth consecutive cultivation in lignocellulose hydrolyzate was nearly as high as for untreated ACA capsules. The mechanical robustness of ACA capsules can be easily improved by treating the capsules with hAPTES. ACA capsules treated with 1.5% hAPTES showed excellent mechanical robustness and a similar ethanol production profile to untreated ACA capsules. © 2012 Society of Chemical Industry

Place, publisher, year, edition, pages
John Wiley & Sons Ltd. , 2013. Vol. 88, no 6, 1080-1088 p.
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Industrial Biotechnology
Research subject
Resource Recovery
Identifiers
URN: urn:nbn:se:hb:diva-1422DOI: 10.1002/jctb.3944ISI: 000319020900014Local ID: 2320/11742OAI: oai:DiVA.org:hb-1422DiVA: diva2:869477
Available from: 2015-11-13 Created: 2015-11-13 Last updated: 2016-09-29Bibliographically approved

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CiteExportLink to record
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