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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 Electrophoresis: Applications

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.
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Site Directed Spin Labeling and EPR Spectroscopic Studies of Pentameric Ligand-Gated Ion Channels
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Spin-echo measurements for capillary rheometry at low field.

Sebastian Richard1, Bruce J Balcom1, Benedict Newling1

  • 1UNB MRI Centre, Department of Physics, University of New Brunswick, 8 Bailey Dr., Fredericton, New Brunswick, E3B 5A3, Canada.

Magnetic Resonance Letters
|June 1, 2026
PubMed
Summary

This study introduces a simple, non-invasive magnetic resonance rheometer to measure fluid viscosity. It reconstructs velocity profiles to analyze shear-rate dependent viscosity, even for challenging fluids like aqueous solutions.

Keywords:
FlowLow-fieldRheometry

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Area of Science:

  • Physics
  • Materials Science
  • Fluid Dynamics

Background:

  • Magnetic resonance imaging (MRI) techniques can probe fluid dynamics.
  • Rheometry traditionally requires invasive measurements.
  • Understanding shear-rate dependent viscosity is crucial for fluid characterization.

Purpose of the Study:

  • To develop a rapid, non-invasive rheometric measurement using magnetic resonance.
  • To reconstruct fluid velocity profiles and determine viscosity.
  • To enhance applicability to fluids with long relaxation times.

Main Methods:

  • Utilizing a single spin-echo sequence with a constant magnetic field gradient.
  • Acquiring a series of spin echoes at varying echo times (TE).
  • Employing a pre-measurement polarization unit for fluids with long T1 relaxation times.

Main Results:

  • Phase of the spin echo is proportional to average velocity.
  • Amplitude relates to velocity distribution in laminar flow.
  • Reconstructed velocity profiles allow for viscosity determination.

Conclusions:

  • The developed method provides a simple, non-invasive, and cost-effective rheometric measurement.
  • It enables the characterization of shear-rate dependent viscosity.
  • The technique is extendable to a wider range of fluids, including aqueous solutions.