Nano Archive

Detection of NADH and ethanol based on catalytic activity of soluble carbon nanofiber with low overpotential

Wu, Lina and Zhang, Xueji and Ju, Huangxian (2006) Detection of NADH and ethanol based on catalytic activity of soluble carbon nanofiber with low overpotential. ANALYTICAL CHEMISTRY, 79 (2). pp. 453-458.

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Official URL: http://pubs.acs.org/doi/abs/10.1021/ac061282%2B

Abstract

The excellent catalytic activity of a novel carbon nanomaterial, soluble carbon nanofiber (CNF) with good dispersion and wettability, to the oxidation of dihydronicotinamide adenine dinucleotide (NADH) was described for biosensing application. The edge plane sites and oxygen-rich groups presented on the CNF surface could be partially responsible for its electrocatalytic behavior, which induced a substantial decrease by 573 mV in the overpotential of NADH oxidation reaction (compared to a bare electrode). The CNF-coated electrode thus allowed highly sensitive amperometric detection of NADH with a low limit of detection (0.11 μM), low applied potential (+0.06 V), and minimization of surface fouling. Such ability of CNF to promote the electron transfer between NADH and the electrode suggested a new, promising biocompatible platform for development of dehydrogenase-based amperometric biosensors. With alcohol dehydrogenase (ADH) as a model, the ADH/CNF-modified electrode could be constructed by a simple casting process. The proposed biosensor showed rapid and highly sensitive amperometric response to ethanol with acceptable preparation reproducibility and excellent stability.

Item Type:Article
Subjects:Analytical Science > Nanotechnology for sensing and actuating
Material Science > Nanostructured materials
ID Code:3153
Deposited By:Anuj Seth
Deposited On:26 May 2009 11:29
Last Modified:26 May 2009 11:29

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