By a News Reporter-Staff News Editor at Energy Weekly News -- New research on Enzymes and Coenzymes is the subject of a report. According to news reporting originating from Galway, Ireland, by VerticalNews correspondents, research stated, "Enzyme electrodes based on cross-linking bilirubin oxidase or a Streptomyces coelicolor laccase (SLac) and osmium redox complexes possessing an amine-terminated molecular tether at graphite electrodes can produce current for oxygen reduction under pseudo-physiological conditions. Here we report on enzyme electrodes for oxygen reduction by co-immobilization of SLac, polyallylamine (PAA) and an [osmium(2,2'-bipyridine)(2)(4-aminomethylpyridine)Cl](+) complex."
Our news editors obtained a quote from the research from National University, "Enzyme electrodes prepared by incorporation of added multi-walled carbon nanotubes as support produce oxygen reduction current densities of 0.8 mA cm(-2) in oxygen saturated, 150 mM NaCl, 50 mM phosphate buffer solution at 37 degrees C, a 3-fold increase in oxygen reduction current densities over those prepared without multi-walled carbon nanotubes. Membrane-less glucose-O-2 fully enzymatic fuel cells are assembled by combination of the SLac-based enzyme electrode as a cathode, with glucose-oxidizing anodes, based on either a pyrroloquinoline quinone (PQQ) or FAD-dependent glucose dehydrogenase (GDH) and tetherable osmium redox complexes."
According to the news editors, the research concluded: "The fuel cell based on selection of PQQGDH enzyme electrode as anode provides a maximum power density of 66 mu W cm(-2) in 5 mM glucose, 150 mM NaCl, phosphate buffer solution at 37 degrees C, dropping to 37 mu W cm(-2) in human serum, the highest reported power density to date for an enzymatic fuel cell operating in serum."
For more information on this research see: Tethering Osmium Complexes within Enzyme Films on Electrodes to Provide a Fully Enzymatic Membrane-Less Glucose/Oxygen Fuel Cell. Journal of the Electrochemical Society, 2013;160(7):G3165-G3170. Journal of the Electrochemical Society can be contacted at: Electrochemical Soc Inc, 65 South Main Street, Pennington, NJ 08534, USA. (The Electrochemical Society - ecsdl.org/; Journal of the Electrochemical Society - www.ecsdl.org/JES)
The news editors report that additional information may be obtained by contacting P.O. Conghaile, Natl Univ Ireland Galway, Ryan Inst, Galway, Ireland. Additional authors for this research include D. MacAodha, B. Egan, P. Kavanagh and D. Leech.
Keywords for this news article include: Galway, Europe, Energy, Ireland, Nanotube, Fuel Cell, Oil & Gas, Chalcogens, Nanotechnology, Emerging Technologies, Enzymes and Coenzymes
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