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A microfluidic chip based liquid-liquid extraction system with microporous membrane.

Zeng-Xuan Cai1, Qun Fang, Heng-Wu Chen

  • 1Institute of Microanalytical Systems, Chemistry Department, Zhejiang University, Hangzhou 310028, China.

Analytica Chimica Acta
|August 29, 2007
PubMed
Summary
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A new microchip enables efficient liquid-liquid extraction for sample pretreatment. This chip-based system uses a microporous membrane and gravity flow for analyte transfer and fluorescence detection.

Area of Science:

  • Analytical Chemistry
  • Microfluidics
  • Separation Science

Background:

  • On-chip sample pretreatment is crucial for improving analytical sensitivity.
  • Traditional liquid-liquid extraction methods can be time-consuming and require large solvent volumes.

Purpose of the Study:

  • To develop a robust and simple microfabricated chip for on-chip liquid-liquid extraction (L-L extraction).
  • To demonstrate the efficiency of the chip-based system for sample pretreatment using fluorescence detection.

Main Methods:

  • Fabrication of a microchip using two glass plates and a microporous membrane, bonded with epoxy.
  • Utilizing gravity-driven flow for aqueous and organic phases through separate channels.
  • In situ monitoring of extracted analyte fluorescence using a laser-induced fluorescence detection system.

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Main Results:

  • Achieved efficient chip-based microporous membrane liquid-liquid extraction.
  • Demonstrated a precision of 1.5% R.S.D. for fluorescence measurements.
  • Obtained a linear response range of 1x10(-7) to 1x10(-4) M for butyl rhodamine B (BRB), with an enrichment factor of approximately 3 and 69% extraction efficiency.

Conclusions:

  • The developed microchip system offers an efficient and simple approach for on-chip sample pretreatment via L-L extraction.
  • The system is suitable for sensitive analyte detection through integrated fluorescence monitoring.
  • This technology has potential for various analytical applications requiring sample enrichment.