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Lignocellulose integration to 1G-ethanol process using filamentous fungi: Fermentation prospects of edible strain of Neurospora intermedia
University of Borås, Faculty of Textiles, Engineering and Business.ORCID iD: 0000-0003-3418-1762
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2018 (English)In: BMC Biotechnology, ISSN 1472-6750, E-ISSN 1472-6750, Vol. 18, no 1, article id 49Article in journal (Refereed) Published
Sustainable development
According to the author(s), the content of this publication falls within the area of sustainable development.
Abstract [en]

Background: Integration of first- and second-generation ethanol processes is one among the alternate approaches that efficiently address the current socio-economic issues of the bioethanol sector. Edible filamentous fungus capable of utilizing pentoses from lignocelluloses and also possessing biomass application as potential animal feed component was used as the fermentation strain for the integration model. This study presents various fermentation aspects of using edible filamentous fungi in the integrated first and second generation ethanol process model. Results: Fermentation of edible strain of N. intermedia on the integrated first and second-generation ethanol substrate (the mixture of dilute acid pretreated and enzymatically hydrolyzed wheat straw and thin stillage from the first-generation ethanol process), showed an ethanol yield maximum of 0.23 +/- 0.05 g/g dry substrate. The growth of fungal pellets in presence of fermentation inhibitors (such as acetic acid, HMF and furfural) resulted in about 11 to 45% increase in ethanol production as compared to filamentous forms, at similar growth conditions in the liquid straw hydrolysate. Fungal cultivations in the airlift reactor showed strong correlation with media viscosity, reaching a maximum of 209.8 +/- 3.7 cP and resulting in 18.2 +/- 1.3 g/L biomass during the growth phase of fungal pellets. Conclusion: N. intermedia fermentation showed high sensitivity to the dilute acid lignocellulose pretreatment process, with improved fermentation performance at milder acidic concentrations. The rheological examinations showed media viscosity to be the most critical factor influencing the oxygen transfer rate during the N. intermedia fermentation process. Mycelial pellet morphology showed better fermentation efficiency and high tolerance towards fermentation inhibitors.

Place, publisher, year, edition, pages
BioMed Central Ltd. , 2018. Vol. 18, no 1, article id 49
Keywords [en]
Integration, Lignocelluloses, Bioethanol, Edible filamentous fungi, Neurospora intermedia
National Category
Industrial Biotechnology
Research subject
Resource Recovery
Identifiers
URN: urn:nbn:se:hb:diva-15626DOI: 10.1186/s12896-018-0444-zScopus ID: 2-s2.0-85051932650OAI: oai:DiVA.org:hb-15626DiVA, id: diva2:1276099
Available from: 2019-01-07 Created: 2019-01-07 Last updated: 2019-01-07

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Lennartsson, Patrik R.Taherzadeh, Mohammad J

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