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Related Concept Videos

Capillary Electrophoresis: Instrumentation01:20

Capillary Electrophoresis: Instrumentation

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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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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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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,...
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Gas Chromatography: Sample Injection Systems01:08

Gas Chromatography: Sample Injection Systems

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In gas chromatography, the sample is introduced as a vapor plug into the carrier gas stream for high efficiency and resolution. A microsyringe injects the sample solution into a heated sample port, vaporizing it and mixing it with the carrier gas. This process is important to ensure the sample is properly prepared for analysis. Thermally sensitive samples can be injected directly into the column and volatilized by slowly increasing the column temperature.
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UV–Vis Spectrometers01:14

UV–Vis Spectrometers

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The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell.
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High-Performance Liquid Chromatography: Elution Process01:05

High-Performance Liquid Chromatography: Elution Process

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In High-Performance Liquid Chromatography (HPLC), the elution process is critical to the separation of analytes and the quality of chromatographic results. Elution describes how compounds move through the column and separate based on their interactions with the mobile and stationary phases. This process determines the resolution, peak shape, and retention times in the chromatogram, which are essential for identifying and quantifying components in complex mixtures. Understanding the elution...
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Related Experiment Video

Updated: Apr 11, 2026

High-throughput and Comprehensive Drug Surveillance Using Multisegment Injection-Capillary Electrophoresis-Mass Spectrometry
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Sequential capillary electrophoresis analysis using optically gated sample injection and UV/vis detection.

Xiaoxia Liu1, Miaomiao Tian1, Mohamed Amara Camara1

  • 1Faculty of Chemistry, Northeast Normal University, ChangChun, Jilin, P. R. China.

Electrophoresis
|June 5, 2015
PubMed
Summary

This study introduces a new method for analyzing amino acids and enzyme reactions using sequential capillary electrophoresis (CE) with optically gated injection. This technique enables precise, real-time monitoring of biochemical processes.

Keywords:
Capillary electrophoresisOnline derivatizationOptically gated injectionSequential analysisUV/vis

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Sheathless Capillary Electrophoresis–Mass Spectrometry for Metabolic Profiling of Biological Samples
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Area of Science:

  • Analytical Chemistry
  • Biochemistry
  • Separation Science

Background:

  • Traditional enzyme assays can be time-consuming and lack real-time kinetic data.
  • Online monitoring of biochemical reactions requires sensitive and reproducible analytical techniques.

Purpose of the Study:

  • To develop and validate a sequential capillary electrophoresis (CE) method for analyzing amino acids and L-asparaginase enzyme kinetics.
  • To integrate on-line derivatization and optically gated (OG) injection with UV-Vis detection for real-time biochemical analysis.

Main Methods:

  • Sequential capillary electrophoresis (CE) with on-line derivatization and optically gated (OG) injection.
  • UV-Vis detection for monitoring substrate consumption and product formation.
  • Optimization of experimental conditions using a standard amino acid mixture.

Main Results:

  • High reproducibility in sequential CE analysis (RSD < 2.6% for peak heights/areas, < 0.8% for migration times).
  • Achieved low limits of detection (LOD) for asparagine (5.0 μM) and aspartic acid (2.0 μM).
  • Successfully monitored L-asparaginase enzyme kinetics in real-time, obtaining Michaelis constants consistent with traditional methods.

Conclusions:

  • The integrated OG injection and UV/Vis detection system provides a feasible and reliable platform for sequential online CE analysis.
  • This method offers potential for real-time monitoring of various chemical reactions and bioprocesses.
  • The developed technique enhances the efficiency and accuracy of enzyme kinetic studies.