TY  - JOUR
A1  - Engel, Mareike
A1  - Holtmann, Dirk
A1  - Ulber, Roland
A1  - Tippkötter, Nils
T1  - Increased Biobutanol Production by Mediator‐Less Electro‐Fermentation
JF  - Biotechnology Journal
N2  - A future bio-economy should not only be based on renewable raw materials but also in the raise of carbon yields of existing production routes. Microbial electrochemical technologies are gaining increased attention for this purpose. In this study, the electro-fermentative production of biobutanol with C. acetobutylicum without the use of exogenous mediators is investigated regarding the medium composition and the reactor design. It is shown that the use of an optimized synthetic culture medium allows higher product concentrations, increased biofilm formation, and higher conductivities compared to a synthetic medium supplemented with yeast extract. Moreover, the optimization of the reactor system results in a doubling of the maximum product concentrations for fermentation products. When a working electrode is polarized at −600 mV vs. Ag/AgCl, a shift from butyrate to acetone and butanol production is induced. This leads to an increased final solvent yield of Yᴀᴃᴇ = 0.202 gg⁻¹ (control 0.103 gg⁻¹), which is also reflected in a higher carbon efficiency of 37.6% compared to 23.3% (control) as well as a fourfold decrease in simplified E-factor to 0.43. The results are promising for further development of biobutanol production in bioelectrochemical systems in order to fulfil the principles of Green Chemistry.
Y1  - 2018
U6  - http://dx.doi.org/10.1002/biot.201800514
SN  - 1860-7314
IS  - Volume 14, Issue 4
SP  - Artikel 1800514
PB  - Wiley-VCH
ER  - 
TY  - JOUR
A1  - Engel, Mareike
A1  - Gemünde, Andre
A1  - Holtmann, Dirk
A1  - Müller-Renno, Christine
A1  - Ziegler, Christiane
A1  - Tippkötter, Nils
A1  - Ulber, Roland
T1  - Clostridium acetobutylicum’s connecting world: cell appendage formation in bioelectrochemical systems
JF  - ChemElectroChem
Y1  - 2019
U6  - http://dx.doi.org/10.1002/celc.201901656
SN  - 2196-0216
IS  - Accepted Article
PB  - Wiley
CY  - Weinheim
ER  - 
TY  - JOUR
A1  - Engel, Mareike
A1  - Bayer, Hendrik
A1  - Holtmann, Dirk
A1  - Tippkötter, Nils
A1  - Ulber, Roland
T1  - Flavin secretion of Clostridium acetobutylicum in a bioelectrochemical system - Is an iron limitation involved?
JF  - Bioelectrochemistry
Y1  - 2019
U6  - http://dx.doi.org/10.1016/j.bioelechem.2019.05.014
SN  - 1567-5394
IS  - In Press, Accepted Manuscript
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - CHAP
A1  - Engel, M.
A1  - Thieringer, J.
A1  - Tippkötter, Nils
T1  - Microbial electrosynthesis for sustainable biobutanol production
T2  - New frontiers of biotech-processes (Himmelfahrtstagung) : 02-04 May 2016, Rhein-Mosel-Halle, Koblenz/Germany
Y1  - 2016
SP  - 77
EP  - 78
PB  - DECHEMA
CY  - Frankfurt am Main
ER  - 
TY  - JOUR
A1  - Elbers, Gereon
A1  - Zang, Thorsten
A1  - Buck, Manfred
T1  - Ruß-Immissionsmessungen im Einflußbereich des Kraftfahrzeugverkehrs
JF  - Staub, Reinhaltung der Luft : air quality control. 50 (1990)
Y1  - 1990
SN  - 0039-0771
SP  - 93
ER  - 
TY  - JOUR
A1  - Elbers, Gereon
A1  - Thomzik, Manfred
T1  - Das Entstehen geruchsintensiver schwefelhaltiger organischer Verbindungen in Lackierereien und Möglichkeiten zu deren Vermeidung
JF  - Aus der Tätigkeit der LIS / Landesanstalt für Immissionsschutz des Landes Nordrhein-Westfalen. 1989 (1990)
Y1  - 1990
SN  - 0931-5497
SP  - 35
ER  - 
TY  - JOUR
A1  - Elbers, Gereon
A1  - Richter, J.
T1  - Messung kraftfahrzeugbedingter Rußimmissionen
JF  - Staub, Reinhaltung der Luft : air quality control. 54 (1994)
Y1  - 1994
SN  - 0039-0771
SP  - 19
ER  - 
TY  - JOUR
A1  - Elbers, Gereon
A1  - Remme, S.
A1  - Lehmann, G.
T1  - EPR of Cr3+ in Tris(acetylacetonato)gallium(III) Single Crystals
JF  - Inorganic Chemistry. 25 (1986)
Y1  - 1986
SN  - 0020-1669
SP  - 896
EP  - 897
ER  - 
TY  - JOUR
A1  - Elbers, Gereon
A1  - Remme, S.
A1  - Lehmann, G.
T1  - EPR and Optical Absorption of Cr3+ in CsCl and CsBr
JF  - Physica Status Solidi (B). 142 (1987), H. 2
Y1  - 1987
SN  - 0031-8957
SP  - 367
EP  - 377
ER  - 
TY  - JOUR
A1  - Elbers, Gereon
A1  - Pfeffer, Hans-Ulrich
A1  - Friesel, Jürgen
A1  - Beier, Reinhold
T1  - Air Pollution Monitoring in Street Canyons / Hans-Ulrich Pfeffer, Jürgen Friesel, Gereon Elbers, Reinhold Beier,
JF  - Transport and air pollution : proceedings ; 3rd international symposium, Palais des Papes, Avignon, France, 6 - 10 June 1994 = Transports et pollution de l'air / [Third International Symposium on Transport and Air Pollution]. Ed. by Robert Joumard. Organizer: French National Institute for Transport and Safety Research
Y1  - 1995
N1  - International Symposium on Transport and Air Pollution  <3, 1994, Avignon>
PB  - Elsevier
CY  - Amsterdam
ER  -