Journal
SCIENCE CHINA-TECHNOLOGICAL SCIENCES
Volume 62, Issue 10, Pages 1719-1725Publisher
SCIENCE PRESS
DOI: 10.1007/s11431-018-9460-9
Keywords
magnetite; ferrihydrite; Fe(III) reduction; electron extraction; increased acetate production; Clostridium bifermentans
Funding
- National Natural Science Foundation of China [91751112, 41573071, 41703075, 41807325]
- Senior User Project of RV KEXUE [KEXUE2018G01]
- Key Research Project of Frontier Science of the Chinese Academy of Sciences [QYZDJ-SSW-DQC015]
- Natural Science Foundation [JQ201608, ZR2016DQ12]
- Young Taishan Scholars Program of Shandong Province [tsqn20161054]
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Conductive mineral nanoparticles, such as magnetite, can promote interspecies electron transfer between syntrophic partners. However, the effect of magnetite has only been inferred in intraspecific electron output. Herein, a hydrogen-producing strain, namely, Clostridium bifermentans, which holds several electron output pathways, was used to study the effect of magnetite on the intraspecific electron output manner. Additionally, insulated amorphous ferrihydrite, which was used as an extracellular electron acceptor, was selected to compare with magnetite. Electrons, which were originally used to generate hydrogen, were shunted with the addition of magnetite and ferrihydrite, which resulted in the reduction of hydrogen production and accumulation of Fe(II). Interestingly, more electrons (39.7% and 53.5%) were extracted by magnetite and ferrihydrite, respectively, which led to less production of butyrate and more acetate. More importantly, the increased electron extraction efficiency suggested that electroactive microorganisms can switch metabolic pathways to adapt to electron budget pressure in intraspecific systems. This work broadens the understanding of the interaction between iron oxides and fermentative hydrogen-producing microbes that hold the capacity of Fe(III) reduction.
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