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Related Experiment Videos

Nanoflow gradient generator for capillary high-performance liquid chromatography.

Kisaburo Deguchi1, Shinya Ito, Shinji Yoshioka

  • 1Division of Biological Sciences, Graduate School of Science, Hokkaido University, Sapporo 001-0021, Japan. deguchi@glyco.sci.hokudai.ac.jp

Analytical Chemistry
|February 28, 2004
PubMed
Summary
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A new method uses an "asymptotic trace 10-port valve" (AT10PV) to create nanoflow gradient elution for capillary HPLC systems. This system accurately replicates gradient profiles with high reproducibility for sensitive analyses.

Area of Science:

  • Analytical Chemistry
  • Chromatography

Background:

  • Capillary high-performance liquid chromatography (HPLC) systems require precise flow control for sensitive analyses.
  • Generating reproducible gradient elution profiles at nanoflow rates presents significant technical challenges.

Purpose of the Study:

  • To develop a novel and effective method for generating nanoflow gradient elution in capillary HPLC.
  • To introduce the
  • asymptotic trace 10-port valve
  • (AT10PV) as a versatile tool for gradient profile conversion.

Main Methods:

  • Development of the AT10PV system utilizing a 10-port switching valve and two injection loops.
  • Conversion of conventional microflow gradient profiles to corresponding nanoflow profiles.
  • Performance evaluation of the AT10PV nanoflow gradient elution generator across a range of flow rates (50–500 nL/min).

Related Experiment Videos

Main Results:

  • The AT10PV system successfully and reproducibly traced original gradient profiles.
  • Demonstrated high repeatability of peak retention times (RSD < 0.3%) in capillary HPLC analysis of a BSA tryptic digest at 200 nL/min.
  • Enabled sequential sample injections comparable to microflow HPLC analysis.

Conclusions:

  • The AT10PV nanoflow gradient elution generator is a robust and reproducible method for capillary HPLC.
  • This technology facilitates sensitive and efficient analyses at nanoflow rates.
  • The AT10PV system offers a practical solution for gradient generation in micro- and nanofluidic chromatography.