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Related Concept Videos

Capillary Electrophoresis: Instrumentation01:20

Capillary Electrophoresis: Instrumentation

431
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...
431
Capillary Electrophoresis: Applications01:30

Capillary Electrophoresis: Applications

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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.
Capillary zone electrophoresis (CZE) separates ionic components based on their electrophoretic mobility. It has been used to separate proteins, amino acids,...
590
Electrophoresis: Overview01:20

Electrophoresis: Overview

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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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Updated: Oct 7, 2025

On-chip Isotachophoresis for Separation of Ions and Purification of Nucleic Acids
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An integrated plastic microchip for enhancing electrophoretic separation using tunable pressure-driven backflows.

Yulan Liu1, Ling Xia1, Xiaohua Xiao1

  • 1School of Chemistry, Sun Yat-sen University, Guangzhou, P. R. China.

Electrophoresis
|January 12, 2022
PubMed
Summary
This summary is machine-generated.

A novel microfluidic chip with an integrated micropump enhances separation efficiency for multiple analytes. This dynamic coating system improves resolving power for rhodamine and amino acid mixtures in complex samples.

Keywords:
Microfluidic CE/ On-chip pumpingPlastic microchipRhodamine dyesTunable pressure-driven backflow

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A Microfluidic Chip for ICPMS Sample Introduction
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Area of Science:

  • Analytical Chemistry
  • Microfluidics
  • Separation Science

Background:

  • Microfluidic capillary electrophoresis (MCE) offers rapid and sensitive multi-analyte determination.
  • Existing MCE systems face challenges with electroosmotic flow (EOF) mismatches at interfaces.
  • Optimizing fluid velocity is crucial for enhancing separation efficiency in MCE.

Purpose of the Study:

  • To develop a dynamic coated cyclic olefin copolymer microchip with an integrated micropump for MCE.
  • To investigate the effect of the micropump on fluid velocity and separation performance.
  • To demonstrate the application of the developed MCE system for analyzing real-world samples.

Main Methods:

  • Fabrication of a polyacrylamide gel membrane micropump integrated onto a cyclic olefin copolymer microchip.
  • Utilizing an electric field across the membrane to generate pressure-driven flow, balancing EOF.
  • Evaluating the influence of gel concentration and voltage on fluid velocity.
  • Assessing separation efficiency and resolving power for rhodamine and amino acid mixtures.
  • Quantifying analytes in food and cosmetic samples using standard addition recovery and HPLC validation.

Main Results:

  • The integrated micropump effectively adjusted fluid velocity, reducing it by a factor of 6.
  • Resolving power for rhodamine and amino acid mixtures was enhanced sixfold and threefold, respectively.
  • High column efficiency was achieved due to minimized dead volume in the integrated system.
  • Accurate quantitation of rhodamines and amino acids in food and cosmetics was confirmed by standard addition recoveries (87.3-106.9% and 89.9-117.4%).

Conclusions:

  • The developed dynamic coated MCE system with an on-chip micropump significantly improves separation performance.
  • The integrated system demonstrates robust application potential for fast, onsite analysis of complex samples.
  • This technology offers a promising solution for sensitive and efficient multi-analyte determination in various fields.