Sub-Zeptomole Detection in a Microfabricated Glass Channel by Thermal-Lens Microscopy.

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  • SATO Kiyoshi
    Department of Applied Chemistry, Graduate School of Engineering, The University of Tokyo
  • KAWANISHI Hiroaki
    Department of Applied Chemistry, Graduate School of Engineering, The University of Tokyo
  • TOKESHI Manabu
    Integrated Chemistry Project, Kanagawa Academy of Science and Technology
  • KITAMORI Takehiko
    Department of Applied Chemistry, Graduate School of Engineering, The University of Tokyo Integrated Chemistry Project, Kanagawa Academy of Science and Technology
  • SAWADA Tsuguo
    Department of Applied Chemistry, Graduate School of Engineering, The University of Tokyo

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A thermal-lens microscope which we developed was applied to an ultramicro quantity determination of a dye in an aque-ous solution filling a microchannel (150 µm wide and 100 µm deep) fabricated in a quartz glass substrate. The detection volume, which corresponded to the confocal volume, was estimated to be 1.3 fl. The detection limit of the dye molecules was 160 ymol, and the calibration line showed good linearity in the sub-zmol-to-zmol region. This detection sensitivity is equivalent to that of laser-induced fluorometry. The thermal-lens signal measured in the microchannel was more stable than that measured in a liquid micro space between a slide glass and a cover glass, which was much wider than the microchannel. This may have been due to a suppression of convection in the microchannel. The thermal lens method can be applied to non-fluorescent chemical species, and is thus very suitable detection method for integrated chemistry sys-tems.

収録刊行物

  • Analytical Sciences

    Analytical Sciences 15 (6), 525-529, 1999

    社団法人 日本分析化学会

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