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Factors affecting detoxification of softwood enzymatic hydrolysates using sodium dithionite
Umeå University, Sweden.
Umeå University, Sweden.
RISE Research Institutes of Sweden, Bioeconomy and Health, Biorefinery and Energy.ORCID iD: 0009-0009-0187-2779
Umeå University, Sweden.
2021 (English)In: Processes, ISSN 2227-9717, Vol. 9, no 5, article id 887Article in journal (Refereed) Published
Abstract [en]

Conditioning of lignocellulosic hydrolysates with sulfur oxyanions, such as dithionite, is one of the most potent methods to improve the fermentability by counteracting effects of inhibitory by-products generated during hydrothermal pretreatment under acidic conditions. The effects of pH, treatment temperature, and dithionite dosage were explored in experiments with softwood hydrolysates, sodium dithionite, and Saccharomyces cerevisiae yeast. Treatments with dithionite at pH 5.5 or 8.5 gave similar results with regard to ethanol productivity and yield on initial glucose, and both were always at least ~20% higher than for treatment at pH 2.5. Experiments in the dithionite concentration range 5.0–12.5 mM and the temperature range 23–110◦ C indicated that treatment at around 75◦ C and using intermediate dithionite dosage was the best option (p ≤ 0.05). The investigation indicates that selection of the optimal temperature and dithionite dosage offers great benefits for the efficient fermentation of hydrolysates from lignin-rich biomass, such as softwood residues. © 2021 by the authors. 

Place, publisher, year, edition, pages
MDPI AG , 2021. Vol. 9, no 5, article id 887
Keywords [en]
Cellulosic ethanol, Conditioning, Detoxification, Inhibitors, Lignocellulose biorefining, Sodium dithionite
National Category
Paper, Pulp and Fiber Technology
Identifiers
URN: urn:nbn:se:ri:diva-53527DOI: 10.3390/pr9050887Scopus ID: 2-s2.0-85106925621OAI: oai:DiVA.org:ri-53527DiVA, id: diva2:1568283
Note

Funding details: Energimyndigheten, P41285-1, P47516-1; Funding details: Kempestiftelserna; Funding text 1: Funding: This research was funded by Swedish Energy Agency (P41285-1, P47516-1), Kempe Foundations, and the Bio4Energy research environment (www.bio4energy.se, accessed on 23 April 2021).

Available from: 2021-06-17 Created: 2021-06-17 Last updated: 2023-12-05Bibliographically approved

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Alriksson, Björn

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