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Miniature flow-injection analysis manifold created by micromilling.

Andrea Rainelli1, Richard Stratz, Karin Schweizer

  • 1Department of Chemistry, The University of Basel, Spitalstrasse 51, 4004 Basel, Switzerland.

Talanta
|October 31, 2008
PubMed
Summary

A new miniature flow injection analysis (muFIA) system offers comparable performance to conventional setups. This microfluidic device uses a mechanically engraved manifold and achieves high sampling rates with minimal reagent consumption.

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Area of Science:

  • Analytical Chemistry
  • Microfluidics
  • Instrumentation

Background:

  • Flow injection analysis (FIA) is a widely used technique for chemical analysis.
  • Miniaturization of analytical systems offers advantages in reduced reagent consumption and faster analysis times.
  • Developing microfluidic systems for FIA requires careful design of channels and detection methods.

Purpose of the Study:

  • To develop and evaluate a miniature flow injection analysis (muFIA) system.
  • To assess the performance of the muFIA system in terms of sampling rate and reagent consumption.
  • To compare the muFIA system's performance with conventional FIA setups.

Main Methods:

  • Fabrication of a muFIA manifold with micro-channels in a PMMA substrate.
  • Utilizing a light-emitting diode (LED) and optical fibers for absorbance detection.

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  • Employing computer-controlled valves and syringe pumps for precise liquid handling.
  • Testing the system with four different applications.

    • Main Results:

    • Achieved a sampling rate of approximately five determinations per minute.
    • Demonstrated low reagent consumption of 10 muL/min.
    • Performance was comparable to conventional FIA systems despite a reduced optical pathlength.
    • Electrokinetic pumping was found to be generally restricted in scope for this system.

    Conclusions:

    • The developed muFIA system is a viable alternative to conventional FIA for certain applications.
    • The system offers significant advantages in terms of reduced sample and reagent volumes.
    • Further optimization may be needed to overcome limitations associated with electrokinetic pumping in microfluidic FIA.