Enhanced electron transfer mediator based on biochar from microalgal sludge for application to bioelectrochemical systems

2018 ◽  
Vol 264 ◽  
pp. 387-390 ◽  
Author(s):  
Ja Hyun Lee ◽  
Dong Sup Kim ◽  
Ji Hyun Yang ◽  
Youngsang Chun ◽  
Hah Young Yoo ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Bioelectrochemical Systems ◽  
Electron Transfer Mediator

scholarly journals Strain- and Substrate-Dependent Redox Mediator and Electricity Production by Pseudomonas aeruginosa

2016 ◽  
Vol 82 (16) ◽  
pp. 5026-5038 ◽  
Author(s):  
Erick M. Bosire ◽  
Lars M. Blank ◽  
Miriam A. Rosenbaum
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Electron Transfer ◽  
Fuel Cells ◽  
Microbial Fuel Cells ◽  
Pure Culture ◽  
Bioelectrochemical Systems ◽  
Content Type ◽  
Mediated Electron Transfer ◽  
Phenazine Production ◽  
Model Strain

ABSTRACTPseudomonas aeruginosais an important, thriving member of microbial communities of microbial bioelectrochemical systems (BES) through the production of versatile phenazine redox mediators. Pure culture experiments with a model strain revealed synergistic interactions ofP. aeruginosawith fermenting microorganisms whereby the synergism was mediated through the shared fermentation product 2,3-butanediol. Our work here shows that the behavior and efficiency ofP. aeruginosain mediated current production is strongly dependent on the strain ofP. aeruginosa. We compared levels of phenazine production by the previously investigated model strainP. aeruginosaPA14, the alternative model strainP. aeruginosaPAO1, and the BES isolatePseudomonassp. strain KRP1 with glucose and the fermentation products 2,3-butanediol and ethanol as carbon substrates. We found significant differences in substrate-dependent phenazine production and resulting anodic current generation for the three strains, with the BES isolate KRP1 being overall the best current producer and showing the highest electrochemical activity with glucose as a substrate (19 μA cm−2with ∼150 μg ml−1phenazine carboxylic acid as a redox mediator). Surprisingly,P. aeruginosaPAO1 showed very low phenazine production and electrochemical activity under all tested conditions.IMPORTANCEMicrobial fuel cells and other microbial bioelectrochemical systems hold great promise for environmental technologies such as wastewater treatment and bioremediation. While there is much emphasis on the development of materials and devices to realize such systems, the investigation and a deeper understanding of the underlying microbiology and ecology are lagging behind. Physiological investigations focus on microorganisms exhibiting direct electron transfer in pure culture systems. Meanwhile, mediated electron transfer with natural redox compounds produced by, for example,Pseudomonas aeruginosamight enable an entire microbial community to access a solid electrode as an alternative electron acceptor. To better understand the ecological relationships between mediator producers and mediator utilizers, we here present a comparison of the phenazine-dependent electroactivities of threePseudomonasstrains. This work forms the foundation for more complex coculture investigations of mediated electron transfer in microbial fuel cells.

Electrochemical communication between microbial cells and electrodes via osmium redox systems

2012 ◽  
Vol 40 (6) ◽  
pp. 1330-1335 ◽  
Author(s):  
Kamrul Hasan ◽  
Sunil A. Patil ◽  
Dónal Leech ◽  
Cecilia Hägerhäll ◽  
Lo Gorton
Keyword(s):  
Electron Transfer ◽  
Biofuel Cells ◽  
Major Group ◽  
Electrochemical Biosensors ◽  
Bioelectrochemical Systems ◽  
Bacterial Cells ◽  
Redox Systems ◽  
Microbial Cells ◽  
Fundamental Part ◽  
Micro Organisms

Electrochemical communication between micro-organisms and electrodes is the integral and fundamental part of BESs (bioelectrochemical systems). The immobilization of bacterial cells on the electrode and ensuring efficient electron transfer to the electrode via a mediator are decisive features of mediated electrochemical biosensors. Notably, mediator-based systems are essential to extract electrons from the non-exoelectrogens, a major group of microbes in Nature. The advantage of using polymeric mediators over diffusible mediators led to the design of osmium redox polymers. Their successful use in enzyme-based biosensors and BFCs (biofuel cells) paved the way for exploring their use in microbial BESs. The present mini-review focuses on osmium-bound redox systems used to date in microbial BESs and their role in shuttling electrons from viable microbial cells to electrodes.

Biosensor Based on TTF@ SiO2 Nanoparticles as Electron Transfer Mediator for the Determination of Glucose1

2006 ◽  
Vol 22 (4) ◽  
pp. 474-478 ◽  
Author(s):  
X LI ◽  
Y XIAN ◽  
H MIN ◽  
C LI ◽  
Z XIE ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Sio2 Nanoparticles ◽  
Electron Transfer Mediator

Tetrabutylammonium–Tetracyanoquinodimethane as Electron-Transfer Mediator in Amperometric Glucose Sensor

1996 ◽  
Vol 53 (3) ◽  
pp. 296-302 ◽  
Author(s):  
Changqing Sun ◽  
Wenbe Song ◽  
Duo Zhao ◽  
Qian Gao ◽  
Hongding Xu
Keyword(s):  
Electron Transfer ◽  
Glucose Sensor ◽  
Electron Transfer Mediator ◽  
Amperometric Glucose Sensor

Electrochemistry and application of a novel monosubstituted squarate electron-transfer mediator in a glucose oxidase-doped poly(phenol) sensor

2004 ◽  
Vol 76 (4) ◽  
pp. 789-799 ◽  
Author(s):  
E. I. Iwuoha ◽  
A. R. Williams-Dottin ◽  
L. A. Hall ◽  
A. Morrin ◽  
G. N. Mathebe ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Glucose Oxidase ◽  
Surface Concentration ◽  
Film Deposition ◽  
Polymerization Process ◽  
Platinum Electrodes ◽  
Electron Transfer Mediator ◽  
Standard Rate ◽  
Amperometric Glucose Biosensors

Electrosynthetic poly(phenol) nanofilms were deposited in situ on platinum electrodes in the presence and absence of glucose oxidase. The synthesis charges and currents of the nonconducting polymer films were recorded at various applied potentials for films grown from 25 –100 mM phenol concentrations. Film parameters such as the standard rate constant for film deposition, film thickness, and surface concentration of the poly(phenol) films were evaluated from the cyclic and step voltammograms of the polymerization process. A novel electron-transfer mediator consisting of monosubstituted 4-hydroxycyclobut-3-ene-1,2-dione (squarate) was used as a mediator for Pt/poly(phenol) nanofilm/GOx amperometric glucose biosensors. Amperometric responses for 3-diphenylamino-4-hydroxycyclobut-3-ene-1,2-dione (diphenylaminosquarate: E°'=of +328 mV/Ag-AgCl at pH 7.0)-mediated systems were measured by both steady-state amperometric and cyclic voltammetry. The sensor sensitivity was calculated to be 558 nA cm−2 (µM)−1.

Electrochemical DNA sensors on the basis of electropolymerized thionine and Azure B with addition of pillar[5]arene as an electron transfer mediator

2019 ◽  
Vol 68 (2) ◽  
pp. 431-437 ◽  
Author(s):  
D. I. Stoikov ◽  
A. V. Porfir’eva ◽  
D. N. Shurpik ◽  
I. I. Stoikov ◽  
G. A. Evtyugin
Keyword(s):  
Electron Transfer ◽  
Dna Sensors ◽  
Electron Transfer Mediator ◽  
Azure B
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