[Todos] Lunes 16 de abril 13 .00 hs - Seminario DQIAQF/INQUIMAE

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Seminarios DQIAQF - INQUIMAE, Lunes 16 de abril - 13 hs.

Aula de Seminarios INQUIMAE - DQIAQF
Facultad de Ciencias Exactas y Naturales
Ciudad Universitaria - Pab. 2  -  Piso 3

*Integrating enzymes, microbes and electrodes: from biosensors to biopower*
* *
Paul Kavanagh

 *School** of Chemistry, National University of Ireland, Galway, Ireland*
Paul.kavanagh en nuigalway.ie
* *
Mediated enzyme reactions form the basis of many applications, ranging from
biosensors, through biofuel cells, to applications in industrial
electrolysis. This presentation will briefly review some of our efforts to
date on redox mediation of enzyme reactions for such applications. Our
studies on laccase biosensors demonstrated, also, that laccases
co-immobilized in redox hydrogels can reduce oxygen at relatively high
potentials and current densities, suggesting possible applications as
cathodes in biofuel cells when combined to oxidation of a fuel, such as
glucose, at the anode. Covalent coupling of enzymes and mediators on
electrode surfaces, particularly structured surfaces, can appreciably
improve the fuel cell stability and output. Also, improvements in the
design of the redox polymers (in terms of structure and redox potential)
help to increase the biofuel cell power output. Our approach at improving
the stability and the power output of the biofuel cell will be presented.

Similarly, biofilms of electro-active bacteria in microbial fuel cells
(MFCs) can facilitate proficient organic carbon removal from wastewater
while producing biological renewable energy in the form of electricity. Our
research examines cyclic voltammetric behaviour of EAB under various growth
conditions to assess the efficiency of such films in MFCs. The approach
adopted examines the role of an applied controlled-potential to enhancing
biofilm electrochemical catalytic activity compared with the behavior of
control biofilms using both single-culture studies (*Geobacter
sulfurreducens, Rhodoferax ferrireducens*) and mixed-culture studies on
model fuel/wastes, and on wastes sourced from municipal and slaughterhouse
waste-streams, as well as fuels derived from second-generation biofuel
crops.
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