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Ethanol production from xylose and wood hydrolyzate by Mucor indicus at different aeration rates
Högskolan i Borås, Institutionen Ingenjörshögskolan.
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2008 (Engelska)Ingår i: BioResources, ISSN 1930-2126, E-ISSN 1930-2126, Vol. 3, nr 4, s. 1020-1029Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The fungus Mucor indicus is able to produce ethanol from xylose as well as dilute-acid lignocellulosic hydrolyzates. The fungus completely assimilated 10 g/L xylose as the sole carbon and energy source within 32 to 65 h at an aeration rate of 0.1 to 1.0 vvm. The highest ethanol yield was 0.16 g/g at 0.1 vvm. Xylitol was formed intermediately with a maximum yield of 0.22 g/g at 0.5 vvm., but disappeared towards the end of experiments. During cultivation in a mixture of xylose and glucose, the fungus did not assimilate xylose as long as glucose was present in the medium. The anaerobic cultivation of the fungus in the hydrolyzate containing 20% xylose and 80% hexoses resulted in no assimilation of xylose but complete consumption of the hexoses in less than 15 h. The ethanol yield was 0.44 g/g. However, the xylose in the hydrolyzate was consumed when the media were aerated at 0.067 to 0.333 vvm. The best ethanol yield was 0.44 g/g at 0.067 vvm. The results of this study suggest that M. indicus hydrolyzate can be first fermented anaerobically for hexose assimilation and subsequently continued under oxygen-limited conditions for xylose fermentation.

Ort, förlag, år, upplaga, sidor
North Carolina State University , 2008. Vol. 3, nr 4, s. 1020-1029
Nyckelord [en]
ethanol, biomass, biogas, lignocelluloses, baker's yeast, saccharomyces, cerevisiae, encapsulation, flocculation, superabsorbents, chitosan, zygomycetes, mucor, rhizopus, rhizomucor, MTBE, biopolymers, furfural, acetic acid, HMF, fed-batch, continuous cultivation, immobilization, denitrification, activated sludge, bread, orange peels, citrus, waste, keratin, chitin, glucosamine, methyl tertiary butyl ether
Nyckelord [sv]
Energi och material
Nationell ämneskategori
Annan industriell bioteknik
Identifikatorer
URN: urn:nbn:se:hb:diva-2427Lokalt ID: 2320/3926OAI: oai:DiVA.org:hb-2427DiVA, id: diva2:870521
Tillgänglig från: 2015-11-13 Skapad: 2015-11-13 Senast uppdaterad: 2017-12-01Bibliografiskt granskad

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Karimi, K.Taherzadeh, M.J.

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