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High-Efficiency Conversion of Bread Residues to Ethanol and Edible Biomass Using Filamentous Fungi at High Solids Loading: A Biorefinery Approach
Department of Fermentation and Cereals Technology, Wrocław University of Environmental and Life Sciences, 51-630 Wrocław, Poland.
Department of Fermentation and Cereals Technology, Wrocław University of Environmental and Life Sciences, 51-630 Wrocław, Poland.
University of Borås, Faculty of Textiles, Engineering and Business. (Swedish Centre for Resource Recovery)ORCID iD: 0000-0003-3418-1762
2022 (English)In: Applied Sciences, E-ISSN 2076-3417, Vol. 12, no 13, article id 6405Article 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]

Bread residues represent a significant fraction of retail food wastes, becoming a severe environmental challenge and an economic loss for the food sector. They are, however, an attractive resource for bioconversion into value-added products. In this study, the edible filamentous fungi Neurospora intermedia and Aspergillus oryzae were employed for the production of bioethanol and high-protein biomass by cultivation on enzymatically liquefied bread-waste medium at 150 g/L solids. The fermentation of hydrolysate by N. intermedia resulted in the ethanol titer of 32.2 g/L and biomass yield of 19.2 g/L with ca. 45% protein. However, the fermentation ended with a considerable amount of residual fermentable sugars; therefore, the liquid medium after the first fermentation was distilled and fermented again by two fungal strains (N. intermedia and A. oryzae). The fermentations resulted in the production of additional ethanol and biomass. A. oryzae showed better performance in the production of biomass, while the other strain yielded more ethanol. The final products’ yield ranged 0.29–0.32 g EtOH/g and 0.20–0.22 g biomass/g bread waste depending on the strain used in the second fermentation. The study shows that valorization of bread residuals by fungi is a promising option for the production of biofuels and foodstuff within the circular bioeconomy approach. 

Place, publisher, year, edition, pages
MDPI, 2022. Vol. 12, no 13, article id 6405
Keywords [sv]
bread residuals, ethanol production, edible biomass, filamentous fungi, Aspergillus oryzae, Neurospora intermedia, biorefinery
National Category
Microbiology
Research subject
Resource Recovery
Identifiers
URN: urn:nbn:se:hb:diva-28113DOI: 10.3390/app12136405ISI: 000824290500001Scopus ID: 2-s2.0-85133012775OAI: oai:DiVA.org:hb-28113DiVA, id: diva2:1676843
Note

Funding: Wroclaw University of Environmental and Life Sciences10.13039/501100017637

Available from: 2022-06-27 Created: 2022-06-27 Last updated: 2023-02-06Bibliographically approved

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Publisher's full textScopushttps://www.mdpi.com/2076-3417/12/13/6405

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Lennartsson, Patrik R.

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