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Sensors 2008, 8(7), 4110-4118; doi:10.3390/s8074110

Development of Amperometric Hydrogen Peroxide Sensor Based on Horseradish Peroxidase-Immobilized Poly(Thiophene-co-EpoxyThiophene)

1, 1, 1,* , 2 and 2
1 Department of Chemistry, BK 21 NanoBiosensor Research Team, Hannam University, Daejeon 305-811, Republic of Korea 2 KT&G Central Research Institute, 305-805, Republic of Korea
* Author to whom correspondence should be addressed.
Received: 26 March 2008 / Revised: 3 June 2008 / Accepted: 12 June 2008 / Published: 9 July 2008
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A modified electrode for hydrogen peroxide (H2O2) sensing was prepared via thiophene (Th) with epoxy group. Thiophene (EpoxyTh) with epoxy group was synthesized by reaction of 3-bromothiophene and glycidyl methacrylate (GMA) in acetonitrile according to Heck Reaction. The electrocopolymerization of Th and EpoxyTh was performed on the surface of indium tin oxide (ITO) electrode by cycling the potential between -1.0 and +2.5 V in mixture of thiophene (Th) and EpoxyTh. Poly(Th-co- EpoxyTh) grown onto the ITO electrode was successfully confirmed by SEM, AFM, and water contact angle analysis, respectively. Finally, the HRP was immobilized on the surface of poly(Th-co-EpoxyTh) electrode by covalent binding. The amperometric response of the HRP-immobilized poly(Th-co-EpoxyTh) electrode for H2O2 was examined by cyclic voltammetry (CV). The HRP-immobilized poly(Th-co-EpoxyTh) electrode showed linearity from 0.1 to 30 mM H2O2, good reproducibility, and long life time.
Keywords: Poly(Th-co-EpoxyTh) electrode; Horseradish peroxidase; Cyclic voltammetry; H2O2 Poly(Th-co-EpoxyTh) electrode; Horseradish peroxidase; Cyclic voltammetry; H2O2
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Kim, H.-J.; Piao, M.-H.; Choi, S.-H.; Shin, C.-H.; Lee, Y.-T. Development of Amperometric Hydrogen Peroxide Sensor Based on Horseradish Peroxidase-Immobilized Poly(Thiophene-co-EpoxyThiophene). Sensors 2008, 8, 4110-4118.

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