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Related Concept Videos

Capillary Electrophoresis: Instrumentation01:20

Capillary Electrophoresis: Instrumentation

Capillary electrophoresis instrumentation typically consists of several key components. A high-voltage power supply generates the electric field necessary for the separation by connecting to an anode (the positively charged electrode) and a cathode (the negatively charged electrode) located in buffer reservoirs at each end of the capillary tube. The system includes a sample vial, a fused silica capillary tube coated with polyimide for mechanical strength through which the sample components...
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Capillary electrophoretic separations offer various modes, each with unique applications. These modes include capillary zone electrophoresis, capillary gel electrophoresis, capillary array electrophoresis, capillary isoelectric focusing, capillary isotachophoresis, micellar electrokinetic chromatography, and capillary electrochromatography.
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Electrophoresis is a powerful analytical separation technique that relies on the differential migration of charged species when subjected to an electric field. The core strength of electrophoresis lies in its ability to separate high-molecular-weight species in complex mixtures. It has found widespread use in biochemistry, molecular biology, and analytical chemistry, allowing the separation of compounds like amino acids, nucleotides, carbohydrates, and proteins with excellent resolution.
There...
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Using buffer additives to improve analyte stream stability in micro free flow electrophoresis.

Nicholas W Frost1, Michael T Bowser

  • 1University of Minnesota, Department of Chemistry, 207 Pleasant St. SE, Minneapolis, MN 55455, USA.

Lab on a Chip
|May 7, 2010
PubMed
Summary

This study enhances micro free flow electrophoresis (microFFE) stability by adding surfactants or nonaqueous solvents to the carrier buffer. These additives reduce electrolysis bubbles, significantly improving analyte stream stability for longer microFFE applications.

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Area of Science:

  • Analytical Chemistry
  • Separation Science
  • Microfluidics

Background:

  • Micro free flow electrophoresis (microFFE) is a continuous separation technique.
  • Electrolysis bubble generation at electrodes limits microFFE stability and flow paths.
  • Stable analyte streams are crucial for effective microFFE separations.

Purpose of the Study:

  • To improve the stability of separated analyte streams in microFFE.
  • To investigate the use of surfactants and nonaqueous solvents to mitigate electrolysis bubble formation.
  • To enable longer-term, stable operation of microFFE devices.

Main Methods:

  • Incorporation of surfactants (SDS, Triton X-100) into the carrier buffer.
  • Addition of nonaqueous solvents (methanol, acetonitrile) to the carrier buffer.
  • Quantification of analyte stream position stability via standard deviation measurements.

Main Results:

  • Addition of 10 mM SDS improved stability by 6-fold.
  • Addition of 300 microM Triton X-100 improved stability by approximately 12-fold.
  • Carrier buffers with 50% methanol and 37.5% acetonitrile showed 8-fold and 6-fold stability improvements, respectively.
  • Stable microFFE operation exceeding two hours was achieved with 300 microM Triton X-100.

Conclusions:

  • Surfactants and nonaqueous solvents effectively stabilize microFFE by reducing electrolysis bubble impact.
  • These additives significantly enhance the reliability and duration of microFFE separations.
  • The findings pave the way for broader applications of stable microFFE.