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Microfluidic gradient formation for nanoflow chip LC.

Reid A Brennen1, Hongfeng Yin, Kevin P Killeen

  • 1Agilent Laboratories, 5301 Stevens Creek Boulevard, Santa Clara, California 95051-7201, USA. reid_brennen@agilent.com

Analytical Chemistry
|November 14, 2007
PubMed
Summary
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A new microfluidic device simplifies nanoflow liquid chromatography (nano-LC) gradient formation using a single pump. This innovation significantly reduces gradient delay time, enhancing throughput for nano-LC/mass spectrometry (nano-LC/MS) analyses.

Area of Science:

  • Analytical Chemistry
  • Separation Science
  • Microfluidics

Background:

  • Traditional nanoflow liquid chromatography (nano-LC) systems often require complex solvent delivery setups.
  • Achieving precise gradients at very low flow rates (below 1 µL/min) can be challenging and time-consuming.
  • Long gradient delay times in nano-LC/mass spectrometry (nano-LC/MS) reduce overall analysis throughput.

Purpose of the Study:

  • To develop a simplified method for generating nano-LC gradients.
  • To reduce the gradient delay time in nano-LC/MS analyses.
  • To improve the robustness and efficiency of nano-LC solvent delivery systems.

Main Methods:

  • A novel microfluidic device was designed to passively form gradients.
  • The device was integrated with an Agilent HPLC-Chip for nano-LC/MS applications.

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  • The system operated at flow rates below 1 µL/min using a single fluid pump.

    • Main Results:

    • The microfluidic device successfully generated nano-LC gradients.
    • Gradient delay time was reduced from minutes to seconds.
    • The method enabled high-throughput nano-LC/MS analysis.

    Conclusions:

    • This microfluidic approach offers a simplified, robust, and reliable nano-LC solvent delivery system.
    • The reduced analysis time significantly increases sample throughput.
    • The technology enhances ease of use and reduces waste in nano-LC applications.