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Related Concept Videos

Electrophoresis: Overview01:20

Electrophoresis: Overview

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...
Capillary Electrophoresis: Applications01:30

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.
Capillary zone electrophoresis (CZE) separates ionic components based on their electrophoretic mobility. It has been used to separate proteins, amino acids,...
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...
Diffusion on Chromatography Columns01:07

Diffusion on Chromatography Columns

In column chromatography, when an analyte is introduced as a narrow band at the top of the column, the solutes begin to separate and broaden, developing a Gaussian profile. This broadening occurs due to various factors, such as longitudinal diffusion.
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Voltammetric Techniques: Linear-Scan (E vs Time)01:12

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Polarography is a classical voltammetric technique used to analyze electrochemical reactions. This method applies a linear potential sweep to a dropping mercury electrode (DME), and the resulting current is measured. A dropping mercury electrode is commonly used as the working electrode in polarography. It consists of a capillary tube filled with mercury, where the tiny droplet forms at the tip. This droplet continuously drops from the capillary, creating a new electrode surface for each...
Electrospray Ionization (ESI) Mass Spectrometry01:12

Electrospray Ionization (ESI) Mass Spectrometry

Higher molecular weight biomolecules are nonvolatile compounds that may decompose before ionizing or vaporizing during mass analysis with conventional electron impact ionization methods. Accordingly, electrospray ionization (ESI) is the favored method for vaporizing and ionizing biomolecules as it circumvents rapid fragmentation and enables the recording of mass signals for the entire biomolecule.
ESI utilizes electrical energy to transfer ions from the liquid phase of the sample into the...

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Using Laser Scanning Microscopy to Determine Electromigration in Molybdenum Disilicide
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Electromigration diffusivity spectrometry: a way for simultaneous determination of diffusion coefficients from mixed

Suhua Yang1, Yiming Zhang, Tao Liao

  • 1Key Laboratory of Analytical Chemistry for Living Biosystems, Institute of Chemistry, Chinese Academy of Sciences, Beijing, P. R. China.

Electrophoresis
|August 7, 2010
PubMed
Summary

A new electromigration-based diffusivity spectrometry method allows simultaneous measurement of diffusion coefficients in mixed samples. This technique provides fast, accurate diffusivity spectra for various compounds with high precision.

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Area of Science:

  • Analytical Chemistry
  • Physical Chemistry

Background:

  • Accurate measurement of diffusion coefficients (D) is crucial in chemical analysis.
  • Simultaneous determination of D in mixed samples presents analytical challenges.

Purpose of the Study:

  • To introduce and validate a novel method, electromigration-based diffusivity spectrometry, for simultaneous D measurement.
  • To develop a practical D-equation for this technique.
  • To assess the method's speed, accuracy, and precision.

Main Methods:

  • Theoretical treatment to deduce the D-equation.
  • Implementation of a modified capillary electrophoresis (CE) system.
  • Electrophoresis-based measurement of diffusion coefficients.
  • Generation of diffusivity spectra (peak area vs. D).

Main Results:

  • Electromigration-based diffusivity spectrometry was successfully realized and validated.
  • The method provides fast and accurate determination of diffusivities for mixed aromatic amino acids, phenols, and organic acids.
  • Diffusivity spectra were generated, analogous to mass spectra.
  • Measurement precision was within 1% for five runs.
  • Obtained D values showed less than 2.2% deviation from literature values.

Conclusions:

  • Electromigration-based diffusivity spectrometry is a viable technique for simultaneous diffusion coefficient measurement.
  • Method precision is highly dependent on running buffer pH and strategic selection of internal standards.
  • The technique offers a promising alternative for rapid and precise diffusivity analysis of complex mixtures.