Ethanol and Protein from Ethanol Plant By-Products Using Edible Fungi Neurospora intermedia and Aspergillus oryzae

Feasible biorefineries for production of second-generation ethanol are difficult to establish due to the process complexity. An alternative is to partially include the process in the first-generation plants. Whole stillage, a by-product from dry-mill ethanol processes from grains, is mostly composed...

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Bibliographic Details
Published in:BioMed research international 2015-01, Vol.2015 (2015), p.1-10
Main Authors: Lennartsson, Patrik R., Taherzadeh, Mohammad J., Ferreira, Jorge A., Bátori, Veronika
Format: Article
Language:English
Subjects:
Alcohol
Alcohol, Denatured
Animal Feed - microbiology
Aspergillus
Aspergillus oryzae
Aspergillus oryzae - metabolism
Biomass
Biomedical research
Bioreactors - microbiology
Cellulase
Cellulase - metabolism
Environmental aspects
Enzymes
Ethanol
Ethanol - metabolism
Fermentation - physiology
Fungi
Lignocellulose
Neurospora
Neurospora - metabolism
Neurospora intermedia
Plants - metabolism
Proteins
Raw materials
Resource Recovery
Resursåtervinning
Saccharomyces cerevisiae
Saccharomyces cerevisiae - metabolism
Studies
Yeast
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Summary:Feasible biorefineries for production of second-generation ethanol are difficult to establish due to the process complexity. An alternative is to partially include the process in the first-generation plants. Whole stillage, a by-product from dry-mill ethanol processes from grains, is mostly composed of undegraded bran and lignocelluloses can be used as a potential substrate for production of ethanol and feed proteins. Ethanol production and the proteins from the stillage were investigated using the edible fungi Neurospora intermedia and Aspergillus oryzae, respectively. N. intermedia produced 4.7 g/L ethanol from the stillage and increased to 8.7 g/L by adding 1 FPU of cellulase/g suspended solids. Saccharomyces cerevisiae produced 0.4 and 5.1 g/L ethanol, respectively. Under a two-stage cultivation with both fungi, up to 7.6 g/L of ethanol and 5.8 g/L of biomass containing 42% (w/w) crude protein were obtained. Both fungi degraded complex substrates including arabinan, glucan, mannan, and xylan where reductions of 91, 73, 38, and 89% (w/v) were achieved, respectively. The inclusion of the current process can lead to the production of 44,000 m3 of ethanol (22% improvement), around 12,000 tons of protein-rich biomass for animal feed, and energy savings considering a typical facility producing 200,000 m3 ethanol/year.
ISSN:2314-6133
2314-6141
2314-6141
DOI:10.1155/2015/176371