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Co-Production of Fungal Biomass Derived Constituents and Ethanol from Citrus Wastes Free Sugars without Auxiliary Nutrients in Airlift Bioreactor
Isfahan University of Technology. (Resource Recovery)
Högskolan i Borås, Akademin för textil, teknik och ekonomi. (Resource Recovery)ORCID-id: 0000-0003-4887-2433
Högskolan i Borås, Akademin för textil, teknik och ekonomi. Isfahan University of Technology. (Resource Recovery)
Isfahan University of Technology.
2016 (Engelska)Ingår i: International Journal of Molecular Sciences, ISSN 1422-0067, E-ISSN 1422-0067, Vol. 17, nr 3, artikel-id 302Artikel i tidskrift (Refereegranskat) Published
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Abstract [en]

The potential of two zygomycetes fungi, Mucor indicus and Rhizopus oryzae, in assimilating citrus waste free sugars (CWFS) and producing fungal chitosan, oil, and protein as well as ethanol was investigated. Extraction of free sugars from citrus waste can reduce its environmental impact by decreasing the possibility of wild microorganisms growth and formation of bad odors, a typical problem facing the citrus industries. A total sugar concentration of 25.1 g/L was obtained by water extraction of citrus waste at room temperature, used for fungal cultivation in shake flasks and airlift bioreactor with no additional nutrients. In shake flasks cultivations, the fungi were only able to assimilate glucose, while fructose remained almost intact. In contrast, the cultivation of M. indicus and R. oryzae in the four-liter airlift bioreactor resulted in the consumption of almost all sugars and production of 250 and 280 g fungal biomass per kg of consumed sugar, respectively. These biomasses correspondingly contained 40% and 51% protein and 9.8% and 4.4% oil. Furthermore, the fungal cell walls, obtained after removing the alkali soluble fraction of the fungi, contained 0.61 and 0.69 g chitin and chitosan per g of cell wall for M. indicus and R. oryzae, respectively. Moreover, the maximum ethanol yield of 36% and 18% was obtained from M. indicus and R. oryzae, respectively. Furthermore, that M. indicus grew as clump mycelia in the airlift bioreactor, while R. oryzae formed spherical suspended pellets, is a promising feature towards industrialization of the process.[on SciFinder (R)]

Ort, förlag, år, upplaga, sidor
2016. Vol. 17, nr 3, artikel-id 302
Nyckelord [en]
mucor indicus, rhizopus oryzae, chitosan, citrus waste, ethanol, oil, pellet, protein
Nationell ämneskategori
Industriell bioteknik
Forskningsämne
Resursåtervinning
Identifikatorer
URN: urn:nbn:se:hb:diva-11441DOI: 10.3390/ijms17030302ISI: 000373712800125PubMedID: 26927089Scopus ID: 2-s2.0-84959230541OAI: oai:DiVA.org:hb-11441DiVA, id: diva2:1056167
Anmärkning

MEDLINE AN 2016759271(Journal; Article; (JOURNAL ARTICLE); (RESEARCH SUPPORT, NON-U.S. GOV'T))

Tillgänglig från: 2016-12-14 Skapad: 2016-12-14 Senast uppdaterad: 2018-11-29Bibliografiskt granskad

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Taherzadeh, Mohammad JZamani, Akram

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