Journal article
An amperometric hydrogen peroxide biosensor based on immobilization of horseradish peroxidase on an electrode modified with magnetic dextran microspheres
Analytical and Bioanalytical Chemistry, Vol.390(3), pp.971-977
2008
Abstract
A new kind of magnetic dextran microsphere (MDMS) with uniform shape and narrow diameter distribution has been prepared from magnetic iron nanoparticles and dextran. Horseradish peroxidase (HRP) was successfully immobilized on the surface of an MDMS-modified glassy-carbon electrode (GCE), and the immobilized HRP displayed excellent electrocatalytic activity in the reduction of H 2O2 in the presence of the mediator hydroquinone (HQ). The effects of experimental variables such as the concentration of HQ, solution pH, and the working potential were investigated for optimum analytical performance. This biosensor had a fast response to H2O2 of less than 10 s and an excellent linear relationship was obtained in the concentration range 0.20 μmol L-1-0.68 mmol L-1, with a detection limit of 0.078 μmol L-1 (S/N = 3) under the optimum conditions. The response showed Michaelis-Menten behavior at larger H2O 2 concentrations, and the apparent Michaelis-Menten constant K Mapp was estimated to be 1.38 mmol L-1. Moreover, the selectivity, stability, and reproducibility of the biosensor were evaluated, with satisfactory results.
Details
- Title
- An amperometric hydrogen peroxide biosensor based on immobilization of horseradish peroxidase on an electrode modified with magnetic dextran microspheres
- Authors/Creators
- H-L Zhang (Author/Creator) - Hubei Normal UniversityG-S Lai (Author/Creator) - Hubei Normal UniversityD-Y Han (Author/Creator) - Hubei Normal UniversityA. Yu (Author/Creator) - Murdoch University
- Publication Details
- Analytical and Bioanalytical Chemistry, Vol.390(3), pp.971-977
- Publisher
- Springer-Verlag
- Identifiers
- 991005540063807891
- Copyright
- © 2007 Springer-Verlag
- Murdoch Affiliation
- School of Chemical and Mathematical Science
- Language
- English
- Resource Type
- Journal article
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- 2 Chemistry
- 2.145 Biosensors
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- Chemistry, Analytical
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- Chemistry