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Hydrogen Production by the Thermophilic Bacterium Thermotoga neapolitana.

Pradhan N, Dipasquale L, d'Ippolito G, Panico A, Lens PN, Esposito G, Fontana A - Int J Mol Sci (2015)

Bottom Line: As the only fuel that is not chemically bound to carbon, hydrogen has gained interest as an energy carrier to face the current environmental issues of greenhouse gas emissions and to substitute the depleting non-renewable reserves.In the last years, there has been a significant increase in the number of publications about the bacterium Thermotoga neapolitana that is responsible for production yields of H2 that are among the highest achievements reported in the literature.The review article is organized into sections focused on biochemical, microbiological and technical issues, including the effect of substrate, reactor type, gas sparging, temperature, pH, hydraulic retention time and organic loading parameters on rate and yield of gas production.

View Article: PubMed Central - PubMed

Affiliation: Department of Civil and Mechanical Engineering, University of Cassino and Southern Lazio, Via Di Biasio, 43, 03043 Cassino, FR, Italy. nirakar.pradhan@gmail.com.

ABSTRACT
As the only fuel that is not chemically bound to carbon, hydrogen has gained interest as an energy carrier to face the current environmental issues of greenhouse gas emissions and to substitute the depleting non-renewable reserves. In the last years, there has been a significant increase in the number of publications about the bacterium Thermotoga neapolitana that is responsible for production yields of H2 that are among the highest achievements reported in the literature. Here we present an extensive overview of the most recent studies on this hyperthermophilic bacterium together with a critical discussion of the potential of fermentative production by this bacterium. The review article is organized into sections focused on biochemical, microbiological and technical issues, including the effect of substrate, reactor type, gas sparging, temperature, pH, hydraulic retention time and organic loading parameters on rate and yield of gas production.

No MeSH data available.


Streamlined biochemical pathway for fermentative H2 production, adapted from Reference [22]. Water is omitted for simplicity.
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ijms-16-12578-f001: Streamlined biochemical pathway for fermentative H2 production, adapted from Reference [22]. Water is omitted for simplicity.

Mentions: As shown in Figure 1, acetate production is driven by formation of additional ATP but, when H2 accumulates and consumption of NADH stops, pyruvate is diverted away for the synthesis of other organic substrates, mostly lactate that is produced by lactate dehydrogenase (LDH) with the concomitant oxidation of NADH. Lactate levels reported during fermentation by Thermotoga species vary from trace amounts up to levels rivaling those of acetate [44,47,48,49]. Low levels of alanine and ethanol have been also reported in T. neapolitana [21,45,50].


Hydrogen Production by the Thermophilic Bacterium Thermotoga neapolitana.

Pradhan N, Dipasquale L, d'Ippolito G, Panico A, Lens PN, Esposito G, Fontana A - Int J Mol Sci (2015)

Streamlined biochemical pathway for fermentative H2 production, adapted from Reference [22]. Water is omitted for simplicity.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4490462&req=5

ijms-16-12578-f001: Streamlined biochemical pathway for fermentative H2 production, adapted from Reference [22]. Water is omitted for simplicity.
Mentions: As shown in Figure 1, acetate production is driven by formation of additional ATP but, when H2 accumulates and consumption of NADH stops, pyruvate is diverted away for the synthesis of other organic substrates, mostly lactate that is produced by lactate dehydrogenase (LDH) with the concomitant oxidation of NADH. Lactate levels reported during fermentation by Thermotoga species vary from trace amounts up to levels rivaling those of acetate [44,47,48,49]. Low levels of alanine and ethanol have been also reported in T. neapolitana [21,45,50].

Bottom Line: As the only fuel that is not chemically bound to carbon, hydrogen has gained interest as an energy carrier to face the current environmental issues of greenhouse gas emissions and to substitute the depleting non-renewable reserves.In the last years, there has been a significant increase in the number of publications about the bacterium Thermotoga neapolitana that is responsible for production yields of H2 that are among the highest achievements reported in the literature.The review article is organized into sections focused on biochemical, microbiological and technical issues, including the effect of substrate, reactor type, gas sparging, temperature, pH, hydraulic retention time and organic loading parameters on rate and yield of gas production.

View Article: PubMed Central - PubMed

Affiliation: Department of Civil and Mechanical Engineering, University of Cassino and Southern Lazio, Via Di Biasio, 43, 03043 Cassino, FR, Italy. nirakar.pradhan@gmail.com.

ABSTRACT
As the only fuel that is not chemically bound to carbon, hydrogen has gained interest as an energy carrier to face the current environmental issues of greenhouse gas emissions and to substitute the depleting non-renewable reserves. In the last years, there has been a significant increase in the number of publications about the bacterium Thermotoga neapolitana that is responsible for production yields of H2 that are among the highest achievements reported in the literature. Here we present an extensive overview of the most recent studies on this hyperthermophilic bacterium together with a critical discussion of the potential of fermentative production by this bacterium. The review article is organized into sections focused on biochemical, microbiological and technical issues, including the effect of substrate, reactor type, gas sparging, temperature, pH, hydraulic retention time and organic loading parameters on rate and yield of gas production.

No MeSH data available.