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Fermentation of mannitol extracts from brown macro algae by Thermophilic Clostridia

Fermentation of mannitol extracts from brown macro algae by Thermophilic Clostridia

Title: Fermentation of mannitol extracts from brown macro algae by Thermophilic Clostridia
Author: Chades, Theo
Scully, Sean   orcid.org/0000-0003-0323-055X
Ingvadóttir, Eva María
Orlygsson, Johann   orcid.org/0000-0002-3034-9743
Date: 2018-08-20
Language: English
Scope: 1931
University/Institute: Háskólinn á Akureyri
University of Akureyri
School: Viðskipta- og raunvísindasvið (HA)
School of Business and Science (UA)
Department: Auðlindadeild (HA)
Faculty of Natural Resource Sciences (UA)
Series: Frontiers in Microbiology;9
ISSN: 1664-302X
DOI: 10.3389/fmicb.2018.01931
Subject: Third generation biomass; Seaweed; Bioprocessing; Lífmassi; Þörungar; Lífefnafræði
URI: https://hdl.handle.net/20.500.11815/1066

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Chades T, Scully SM, Ingvadottir EM and Orlygsson J (2018) Fermentation of Mannitol Extracts From Brown Macro Algae by Thermophilic Clostridia. Front. Microbiol. 9:1931. doi: 10.3389/fmicb.2018.01931


Mannitol-containing macro algae biomass, such as Ascophyllum nodosum and Laminaria digitata, are a potential feedstock for the production of biofuels such as bioethanol. The purpose of this work was to evaluate the ability of thermophilic anaerobes within Class Clostridia to ferment mannitol and mannitol-containing algal extracts. Screening of the type strains of six genera, Caldanaerobius, Caldanaerobacter, Caldicellulosiruptor, Thermoanaerobacter, Thermobrachium, and Thermoanaerobacterium) was conducted on 20 mM mannitol and revealed that 11 of 41 strains could utilize mannitol with ethanol being the dominant end-product. Mannitol utilization seems to be most common within the genus of Thermoanaerobacter (7 of 16 strains) with yields up to 88% of the theoretical yield in the case of Thermoanaerobacter pseudoethanolicus. Six selected mannitol-degrading strains (all Thermoanaerobacter species) were grown on mannitol extracts prepared from A. nodosum and L. digitata. Five of the strains produced similar amounts of ethanol as compared with ethanol yields from mannitol only. Finally, T. pseudoethanolicus was kinetically monitored using mannitol and mannitol extracts made from two macro algae species, A. nodosum and L. digitata for end-product formation.


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