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Web End = J Ind Microbiol Biotechnol (2015) 42:12171224 DOI 10.1007/s10295-015-1646-1
FERMENTATION, CELL CULTURE AND BIOENGINEERING
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Web End = Inuence of glucose fermentation on CO2 assimilation to acetate in homoacetogen Blautia coccoides GA1
Chong Liu1 Jianzheng Li1,2 Yupeng Zhang1 Antwi Philip1 En Shi1 Xue Chi1 Jia Meng1
Received: 17 April 2015 / Accepted: 16 June 2015 / Published online: 8 July 2015 Society for Industrial Microbiology and Biotechnology 2015
energy conservation, acetate production, and biomass formation from CO2 [7]. Thus, facultative autotrophic growth on H2/CO2 or carbon monoxide (CO) is possible [1, 3].
These anaerobes can also utilize organic compounds heterotrophically to produce acetate and form biomass [17, 18, 26]. Acetyl-CoA is the intermediate generated from heterotrophic Embden-Meyerhof-Parnas (EMP) pathway and autotrophic WLP to produce acetate in homoacetogens [19]. These homoacetogens are important to the evolution of life and global carbon cycle [4, 9, 25] and distributed widely in natural environment and very versatile in trophic behavior [6, 25].
In the natural environment, such as soils, aquatic sediments, oil eld, wastewater sediments, sewage sludge, etc., heterotrophic activity of homoacetogens is maintained due to the existence of organic substrate, but the autotrophic activity is often overlooked [7]. Though metabolism both in autotrophy and heterotrophy of homoacetogens has been investigated, interaction of the two metabolisms has not been well understood. Furthermore, the interrelationship of the two pathways is species dependent. Braun and Gottschalk reported that C. aceticum could grow mixtrophically and the hydrogenase activity in fructose-growth cells amounted to 12 % of that of H2/CO2 growth [2]. Therefore, a thorough understanding of how the autotrophic metabolic pathway occurs with the existence of organic substrate is an issue of great importance that needs to be known.
Homoacetogens also inhabit anaerobic digestion systems and have the ability to adjust hydrogen partial pressure (PH2) and supply acetate to methanogens [12, 27].
Over the period, two-phase anaerobic biological treatment process has been widely used in treating various organic wastewaters of high strength discharged from industries [8, 13]. Biogas released from the acidogenic phase contains a large of H2 and CO2 that...