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Laser-induced fluorescence microscopic system using an optical parametric oscillator for tunable detection in

Momoko Kumemura1, Tamao Odake, Takashi Korenaga

  • 1Department of Ecosystem Engineering, Graduate School of Engineering, University of Tokushima, 2-1 Minami-jousanjima, Tokushima 770-8506, Japan. momo@iis.u-tokyo.ac.jp

Analytical and Bioanalytical Chemistry
|June 2, 2005
PubMed
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A novel laser-induced fluorescence microscopic system offers highly sensitive, tunable detection for microchip analysis. This system achieved single-molecule detection limits for DNA, significantly outperforming conventional methods.

Area of Science:

  • Analytical Chemistry
  • Microscopy
  • Spectroscopy

Background:

  • Conventional fluorophotometers have limitations in sensitivity for microchip analysis.
  • Optical parametric oscillation (OPO) offers potential for tunable laser sources.

Purpose of the Study:

  • To construct and evaluate a laser-induced fluorescence microscopic system using OPO for microchip analysis.
  • To assess the system's sensitivity and tunability as a fluorescence detector.

Main Methods:

  • Development of a laser-induced fluorescence microscopic system incorporating an optical parametric oscillator.
  • Testing the system with sulforhodamine B for detection limit determination.
  • Application to the analysis of fluorescence-labeled DNA in a microchannel.

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Main Results:

  • Achieved a detection limit of 0.2 mumol for sulforhodamine B, an eight-order-of-magnitude improvement over conventional fluorophotometers.
  • Demonstrated single-molecule detection limits for fluorescence-labeled DNA in a microchannel.
  • Confirmed the system's tunability for different excitation and emission wavelengths.

Conclusions:

  • The developed laser-induced fluorescence microscopic system is a highly sensitive and tunable detector.
  • The system shows significant potential for advanced microchip-based analytical applications.
  • Feasibility for single-molecule detection in microfluidic devices was established.