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- Title
Assessment of Five Electron‐Shuttling Molecules in the Extracellular Electron Transfer of Electromethanogenesis by using Methanosarcina barkeri.
- Authors
Liang, Tian‐Tian; Zhou, Lei; Irfan, Muhammad; Bai, Yang; Liu, Xue‐Zhi; Zhang, Ji‐Liang; Wu, Zong‐Yang; Wang, Wen‐Zhuo; Liu, Jin‐Feng; Cheng, Lei; Yang, Shi‐Zhong; Ye, Ru‐Qiang; Gu, Ji‐Dong; Mu, Bo‐Zhong
- Abstract
Electron‐shuttling molecules (ESMs), natural or synthetic, are utilized by microorganisms as electron acceptors or donors to facilitate electron transfer. In this study, five ESMs, namely anthraquinone‐2‐carboxylic acid (AQC), 9,10‐anthraquinone‐2‐sulfonicacid (AQS), 9,10‐anthraquinone‐2,6‐disulfonic acid (AQDS), Neutral red, and Thionin, were selected to assess their effects on electromethanogenesis under different electrochemical potentials and concentrations. Results showed that the rate of methanogenesis achieved in the presence of AQC was 7.4 times higher than that of the control (without ESMs) at −850 mV (vs. Ag/AgCl). The effectiveness on methanogenesis followed AQC, Neutral Red, AQS, AQDS, and Thionin in a decreasing order. Compared with the control, the addition of ESMs did not affect the biomass of methanogens significantly. Meanwhile, qPCR analysis of the ccdA gene indicated that the abundance of the Cytochrome c gene and the extent of CO2 reduction to methane correlated positively. The promoting effect of the selective ESMs on methanogenesis was mainly related to their electron transfer capabilities.
- Subjects
CHARGE exchange; ELECTRON donors; ELECTROPHILES; MOLECULES; BIOMASS; CYTOCHROME c
- Publication
ChemElectroChem, 2020, Vol 7, Issue 18, p3783
- ISSN
2196-0216
- Publication type
Article
- DOI
10.1002/celc.202000918