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Capillary Electrophoresis: Instrumentation01:20

Capillary Electrophoresis: Instrumentation

838
Capillary electrophoresis instrumentation typically consists of several key components. A high-voltage power supply generates the electric field necessary for the separation by connecting to an anode (the positively charged electrode) and a cathode (the negatively charged electrode) located in buffer reservoirs at each end of the capillary tube. The system includes a sample vial, a fused silica capillary tube coated with polyimide for mechanical strength through which the sample components...
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Related Experiment Video

Updated: Jan 3, 2026

Miniaturized Sample Preparation for Transmission Electron Microscopy
09:04

Miniaturized Sample Preparation for Transmission Electron Microscopy

Published on: July 27, 2018

20.5K

Braid configuration designed for fiber-packed capillary in microscale sample preparation.

Koki Nakagami1, Tomoya Monobe1, Ohjiro Sumiya1

  • 1Department of Applied Chemistry and Life Science, Toyohashi University of Technology, Toyohashi 441-8580, Japan.

Journal of Chromatography. A
|November 23, 2019
PubMed
Summary

A new miniaturized device uses a novel braid-type extraction medium for efficient sample preparation. This method achieves over 90% extraction efficiency and enables heat-assisted desorption, improving analytical sensitivity.

Keywords:
BraidSample preparationSolid phase extractionSynthetic fiberThermal desorption

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Area of Science:

  • Analytical Chemistry
  • Materials Science

Background:

  • Miniaturized sample preparation is crucial for efficient and sensitive analysis.
  • Developing novel extraction media is key to improving analytical performance.

Purpose of the Study:

  • To develop a novel miniaturized sample preparation device utilizing a braid-type extraction medium.
  • To optimize extraction and desorption conditions for enhanced analyte recovery.
  • To investigate heat-assisted desorption for improved analytical sensitivity.

Main Methods:

  • Fabrication of a braid-type extraction medium using fine synthetic filaments with controlled tension.
  • Systematic optimization of extraction and desorption parameters.
  • Integration of a stainless steel wire for heat-assisted desorption via low voltage application.

Main Results:

  • Achieved over 90% extraction efficiency for phenanthrene from water.
  • Demonstrated complete desorption (>99.0%) using heat-assisted desorption with 2V.
  • Established low limits of detection (LOD) and quantification (LOQ) for phenanthrene.

Conclusions:

  • The developed miniaturized device and braid-type extraction medium offer efficient sample preparation.
  • Heat-assisted desorption significantly enhances analyte recovery and analytical sensitivity.
  • This technology holds promise for trace analysis applications.