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  4. Addition of riboflavin-coupled magnetic beads increases current production in bioelectrochemical systems via the increased formation of anode-biofilms
 
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Addition of riboflavin-coupled magnetic beads increases current production in bioelectrochemical systems via the increased formation of anode-biofilms

Citation Link: https://doi.org/10.15480/882.3745
Publikationstyp
Journal Article
Date Issued
2019-02-05
Sprache
English
Author(s)
Arinda, Tutut  
Philipp, Laura-Alina 
Rehnlund, David  
Edel, Miriam 
Chodorski, Jonas  
Stöckl, Markus  
Holtmann, Dirk  
Ulber, Roland  
Gescher, Johannes 
Sturm-Richter, Katrin  
TORE-DOI
10.15480/882.3745
TORE-URI
http://hdl.handle.net/11420/10237
Journal
Frontiers in microbiology  
Volume
10
Issue
FEB
Article Number
126
Citation
Frontiers in Microbiology 10 (FEB): 126 (2019)
Publisher DOI
10.3389/fmicb.2019.00126
Scopus ID
2-s2.0-85065989842
Shewanella oneidensis is one of the best-understood model organisms for extracellular electron transfer. Endogenously produced and exported flavin molecules seem to play an important role in this process and mediate the connection between respiratory enzymes on the cell surface and the insoluble substrate by acting as electron shuttle and cytochrome-bound cofactor. Consequently, the addition of riboflavin to a bioelectrochemical system (BES) containing S. oneidensis cells as biocatalyst leads to a strong current increase. Still, an external application of riboflavin to increase current production in continuously operating BESs does not seem to be applicable due to the constant washout of the soluble flavin compound. In this study, we developed a recyclable electron shuttle to overcome the limitation of mediator addition to BES. Riboflavin was coupled to magnetic beads that can easily be recycled from the medium. The effect on current production and cell distribution in a BES as well as the recovery rate and the stability of the beads was investigated. The addition of synthesized beads leads to a more than twofold higher current production, which was likely caused by increased biofilm production. Moreover, 90% of the flavin-coupled beads could be recovered from the BESs using a magnetic separator.
Subjects
Bioelectrochemical systems
Electron shuttle
Extracellular electron transfer
Flavins
Magnetic beads
Shewanella oneidensis
DDC Class
570: Biowissenschaften, Biologie
Lizenz
https://creativecommons.org/licenses/by/4.0/
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