Detection of Superoxide Anion Radical Using Iron Porphyrin Complexes Bound to Electropolymerized Axial Ligands

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  • YUASA Makoto
    Faculty of Science and Technology, Tokyo University of Science Research Institute for Science and Technology, Tokyo University of Science
  • KOBAYASHI Tomohiro
    Faculty of Science and Technology, Tokyo University of Science
  • AOKI Tetsuya
    Faculty of Science and Technology, Tokyo University of Science
  • FUJII Hiroyuki
    Faculty of Science and Technology, Tokyo University of Science
  • IGARASHI Masatsugu
    Faculty of Science and Technology, Tokyo University of Science
  • MURATA Hidenori
    Faculty of Science and Technology, Tokyo University of Science Research Institute for Science and Technology, Tokyo University of Science

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Other Title
  • 電解重合性軸配位子に結合した鉄ポルフィリン錯体によるスーパーオキシドアニオンラジカルの検出
  • デンカイ ジュウゴウセイジク ハイイシ ニ ケツゴウ シタ テツ ポルフィリン サクタイ ニ ヨル スーパーオキシドアニオンラジカル ノ ケンシュツ

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Description

Iron porphyrin complexes were applied for the electrochemical detection of superoxide anion radical (O2−•). An electropolymerizable axial ligand, 1-(4-(3-thienyl)benzyl)imidazole was designed and synthesized for the application to a sensor for O2−•. The axial ligand was electropolymerized onto a grassy carbon (GC) electrode. This electrode was immersed into the solution of iron porphyrin complexes. UV-visible absorption spectrum showed that iron porphyrin complexes were successfully bound to the axial ligand, and differential pulse voltammograms showed redox responses near 0 to −0.3 V vs. Ag/AgCl due to Fe2+/3+. These electrodes were applied to detect O2−• produced by the xanthine oxidase (XOD)-catalyzed xanthine oxidation. These electrodes showed a linear relationship between the current and the O2−• concentration.

Journal

  • Electrochemistry

    Electrochemistry 77 (11), 940-944, 2009

    The Electrochemical Society of Japan

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