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Assessment of Five Electron‐Shuttling Molecules in the Extracellular Electron Transfer of Electromethanogenesis by using Methanosarcina barkeri
Author(s) -
Liang TianTian,
Zhou Lei,
Irfan Muhammad,
Bai Yang,
Liu XueZhi,
Zhang JiLiang,
Wu ZongYang,
Wang WenZhuo,
Liu JinFeng,
Cheng Lei,
Yang ShiZhong,
Ye RuQiang,
Gu JiDong,
Mu BoZhong
Publication year - 2020
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.202000918
Subject(s) - methanogenesis , anthraquinone , electron transfer , chemistry , electron acceptor , electrochemistry , electron transport chain , photochemistry , methane , biochemistry , organic chemistry , electrode
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 CO 2 reduction to methane correlated positively. The promoting effect of the selective ESMs on methanogenesis was mainly related to their electron transfer capabilities.