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Introduction to Solid Supported Membrane Based Electrophysiology
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Electromembrane Extraction Using Sacrificial Electrodes.

Frederik A Hansen1, Henrik Jensen2, Stig Pedersen-Bjergaard1,2

  • 1Department of Pharmacy, University of Oslo, P.O. Box 1068 Blindern, 0316 Oslo, Norway.

Analytical Chemistry
|March 24, 2020
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Summary
This summary is machine-generated.

This study introduces sacrificial electrodes to prevent water electrolysis during electromembrane extraction (EME). These electrodes enhance stability and analyte recovery by enabling higher currents in EME systems.

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Area of Science:

  • Analytical Chemistry
  • Electrochemistry

Background:

  • Electromembrane extraction (EME) is a sample preparation technique.
  • Water electrolysis can occur in the acceptor solution during EME, leading to gas formation and pH changes.
  • This limits the operational current and stability of EME systems.

Purpose of the Study:

  • To introduce and evaluate the use of sacrificial electrodes in the acceptor solution during EME.
  • To investigate the ability of sacrificial electrodes to inhibit water electrolysis.
  • To assess the impact of sacrificial electrodes on analyte recovery and system stability.

Main Methods:

  • A sacrificial electrode was fabricated using a silver wire with electroplated silver chloride.
  • Design-of-experiments (DOE) was used to optimize the electroplating process.
  • The sacrificial electrode's performance was tested in standard EME and micro-EME (μ-EME) systems.
  • Polar analytes were extracted under high-current conditions (500 μA) to evaluate recovery.

Main Results:

  • The sacrificial electrode effectively inhibited water electrolysis for up to 30 minutes at 500 μA.
  • The electrode's redox capacity increased with repeated use.
  • High-current EME with sacrificial electrodes significantly improved analyte recoveries compared to lower currents (100 μA).
  • Bubble formation was eliminated in μ-EME systems, enhancing stability.

Conclusions:

  • Sacrificial electrodes are effective in preventing water electrolysis in EME acceptor solutions.
  • These electrodes enable stable operation at high currents, leading to improved analyte extraction efficiency.
  • Sacrificial electrodes enhance the robustness and applicability of EME, particularly in microfluidic devices.