Fabrication of Sensor for Reactive Oxygen Species Using Gold Electrodes Modified with E1ectropolymerized Porphyrins and Application for Detection of Stress of Plants

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  • Yuasa Makoto
    Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science Institute of Colloid and Interface Science, Tokyo University of Science
  • Oyaizu Kenichi
    Institute of Colloid and Interface Science, Tokyo University of Science
  • Murata Hidenori
    Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science
  • Kobayashi Tomohiro
    Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science
  • Kobayashi Chihiro
    Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science

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  • Fabrication of Sensor for Reactive Oxygen Species Using Gold Electrodes Modified with Electropolymerized Porphyrins and Application for Detection of Stress of Plants

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Reactive Oxygen Spiecies (ROS) such as superoxide anion radical (·O2-) act as signals for the activation of stress-response and defense pathways. However, excess ROS generated by perturbing ·O2- homeostasis stimulated many environmental stress, including intense light, drought, temperature stress, herbicides, induce high radical toxicity. Consequently, quantitative analysis of ·O2- is a subject of intense research, since most of ROS are derived from ·O2-. Iron meso-tetrakis(3-thienyl)porphyrin complexes were electropolymerized onto a Au wire electrode. The modified Au electrode were applied to ·O2- sensor to detect catalytic oxidation current of ·O2- which was generated as an intermediate during the oxidation of xanthine by catalystic XOD. It was revealed that the sensor was quantitative to measure ·O2-. The modified Au electrode were applied to measure oxidation current of ·O2- in mung beans under environmental stress condition. Plants were grown in atmosphere, 25°C and in black darkness. The other plants were exposed to oxygen excess. The oxidation current of ·O2- were increased plants were grown by high-oxygen environment compared to plants were grown at atmosphere. This experiment was indicated that environmental stress such as hyperoxia induced excess ·O2- and Au wire sensor using iron porphyrin complexes is capable of ·O2- detection in plants under environmental stresses.<br>

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