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Conversion of dilute-acid hydrolyzates of spruce and birch to ethanol by fed-batch fermentation
Chalmers University of Technology.ORCID iD: 0000-0003-4887-2433
Chalmers University of Technology.
Chalmers University of Technology.
1999 (English)In: Bioresource Technology, ISSN 0960-8524, E-ISSN 1873-2976, Vol. 69, no 1, p. 59-66Article in journal (Refereed) Published
Abstract [en]

Fermentation techniques for conversion of dilute acid hydrolyzates were examined. Batch and fed-batch fermentations of hydrolyzates from spruce and birch woods were made in a lab-scale (3.31) anaerobic bioreactor using the yeast Saccharomyces cerevisiae. The spruce and birch hydrolyzates contained high initial concentrations of furfural (2.2 and 5.7 g/l) and 5-hydroxymethylfurfural (HMF, 7.3 and 2.4 g/l), and were found to be strongly inhibiting to the yeast strain used in this study. Fermentation of the hydrolyzates was not possible using a batch mode of operation. However, using a fed-batch technique with a suitably adjusted feed rate, it was found possible to completely ferment the glucose and mannose sugars in both hydrolyzates. Most of the furfural (90%), and part of the HMF (40-70%), present in the hydrolyzates was converted during the fed-batch operation. It is suggested that the success of the fed-batch operation is related to the conversion of furfural and HMF.Fermentation techniques for conversion of dilute acid hydrolyzates were examined. Batch and fed-batch fermentations of hydrolyzates from spruce and birch woods were made in a lab-scale (3.31) anaerobic bioreactor using the yeast Saccharomyces cerevisiae. The spruce and birch hydrolyzates contained high initial concentrations of furfural (2.2 and 5.7 g/l) and 5-hydroxymethylfurfural (HMF, 7.3 and 2.4 g/l), and were found to be strongly inhibiting to the yeast strain used in this study. Fermentation of the hydrolyzates was not possible using a batch mode of operation. However, using a fed-batch technique with a suitably adjusted feed rate, it was found possible to completely ferment the glucose and mannose sugars in both hydrolyzates. Most of the furfural (90%), and part of the HMF (40-70%), present in the hydrolyzates was converted during the fed-batch operation. It is suggested that the success of the fed-batch operation is related to the conversion of furfural and HMF.

Place, publisher, year, edition, pages
Exeter, United Kingdom: Elsevier Sci Ltd , 1999. Vol. 69, no 1, p. 59-66
Keywords [en]
Ethanol, Fed-batch, Furfural, HMF, Inhibitors, Saccharomyces cerevisiae
National Category
Industrial Biotechnology
Identifiers
URN: urn:nbn:se:hb:diva-14861DOI: 10.1016/S0960-8524(98)00169-2ISI: 000078633000007Scopus ID: 2-s2.0-0033167835ISBN: 09608524 (ISSN) OAI: oai:DiVA.org:hb-14861DiVA, id: diva2:1236322
Available from: 2018-08-01 Created: 2018-08-01 Last updated: 2018-08-08Bibliographically approved

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Taherzadeh, Mohammad J

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