Biotechnological Prospects of Thermoanerobacter AK15: End-Product Formation from Carbohydrates, Amino Acids, and Lignocellulosic and Macroalgae Hydrolysates

The conversion of lignocellulosic and algal biomass by thermophilic bacteria has been an area of active investigation. species have proven to be particularly capable in the production of bioethanol and biohydrogen from lignocellulosic biomass, although detailed studies of their abilities to utilize...

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Bibliographic Details
Published in:International journal of molecular sciences 2024-03, Vol.25 (6), p.3490
Main Authors: Orlygsson, Johann, Scully, Sean Michael
Format: Article
Language:English
Subjects:
Alcohol
Algae
Amino acids
Amino Acids - metabolism
Amino Acids, Branched-Chain - metabolism
Biodiesel fuels
Biofuels
Biomass
Carbohydrates
Cellulose
Ethanol
Ethanol - metabolism
Fermentation
Glucose
Glucose - metabolism
Hydrogen
Investigations
Lignocellulose
Seaweed - metabolism
Sustainable development
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Summary:The conversion of lignocellulosic and algal biomass by thermophilic bacteria has been an area of active investigation. species have proven to be particularly capable in the production of bioethanol and biohydrogen from lignocellulosic biomass, although detailed studies of their abilities to utilize the full gamut of carbohydrate, amino acids, and proteins encountered in biomass hydrolysates are seldom comprehensively examined. Here, we re-evaluate the ability of strain AK15, a highly ethanologenic strain previously isolated from a hot spring in Iceland. Similar to other species, the strain degraded a wide range of mono- and di-saccharides and produced a maximum of 1.57 mol ethanol per mol of glucose degraded at high liquid-gas phase ratios. The ability of strain AK15 to utilize amino acids in the presence of thiosulfate is limited to the branched-chain amino acids as well as serine and threonine. Similar to other species, strain AK15 produces a mixture of branched-chain fatty acids and alcohols, making the strain of interest as a potential source of longer-chain alcohols. Finally, the strain was also shown to use butyrate as an electron sink during glucose degradation resulting in the reduced product butanol, in addition to end-products produced from glucose. Thus, strain AK15 is a promising candidate for ethanol and higher-order alcohols from a range of lignocellulosic and algal biomass.
ISSN:1422-0067
1661-6596
1422-0067
DOI:10.3390/ijms25063490