NDLI: Electrocatalytic activity of carbon spheres towards NADH oxidation at low overpotential and its applications in biosensors and biofuel cells

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Electrocatalytic activity of carbon spheres towards NADH oxidation at low overpotential and its applications in biosensors and biofuel cells

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Electrocatalytic activity of carbon spheres towards NADH oxidation at low overpotential and its applications in biosensors and biofuel cells

Content Provider	Royal Society of Chemistry (RSC)
Author	Guo, Xinying Yin, Jun Zhao, Dan Gao, Feng Li, Maoguo Wang, Lun
Copyright Year	2011
Abstract	The excellent electrocatalytic activity of a micro-structured carbon material, carbon hollow spheres (CS), to the oxidation of dihydronicotinamide adenine dinucleotide (NADH) is demonstrated here. Compared to conventional bare glassy carbon electrodes, a substantial decrease by 450 mV in the overpotential of NADH electrooxidation was observed using CS coatings, with oxidation starting at ca. −0.10 V (vs.Ag/AgCl, pH 7.0). The CS-coated glassy carbon electrode (CS/GC) thus allows highly sensitive and direct amperometric detection of NADH at lower potential, ranging from 0.20 to 100 μM with a high sensitivity of 7.3 ± 0.2 nA μM−1 (i.e., 103.3 ± 2.8 nA μM−1 cm−2), low detection limit of 0.08 ± 0.03 μM, and minimization of surface fouling. With lactate dehydrogenase (LDH) as a model, a lactate biosensor with the LDH-CS/GC electrode was constructed and the biosensor shows rapid and highly sensitive amperometric response to lactate ranging from 0.5 to 12 μM with a detection limit of 3.7 ± 0.2 μM, a sensitivity of 4.1 ± 0.2 nA μM−1 (i.e., 57.9 ± 2.8 nA μM−1 cm−2), good reproducibility and excellent stability. Furthermore, the promoted direct electron transfer (DET) of bilirubin oxidase (BOD) on CS/GC electrode was investigated, and thus a membrane-less lactate/oxygen biofuel cell was assembled by using LDH-CS/GC as bioanode for lactate oxidation and BOD-CS/GC electrode for oxygen reduction, with a high open-circuit potential of 0.60 V. Such ability of CS to decrease the NADH oxidation overpotential and promote DET of blue-copper oxidases suggests great promise for dehydrogenase-based amperometric biosensors and biofuel cells.
Starting Page	1301
Ending Page	1309
Page Count	9
File Format	HTM / HTML PDF
ISSN	20462069
Volume Number	1
Issue Number	7
Journal	RSC Advances
DOI	10.1039/c1ra00444a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Oxygen Electrode Detroit Tigers Oxidase Adenine Overpotential Lactate dehydrogenase Biofuel Carbon LDH NADH Biosensor Nicotinamide adenine dinucleotide Lactic acid
Content Type	Text
Resource Type	Article
Subject	Chemistry Chemical Engineering

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