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Related Concept Videos

Capillary Electrophoresis: Applications01:30

Capillary Electrophoresis: Applications

517
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,...
517
Capillary Electrophoresis: Instrumentation01:20

Capillary Electrophoresis: Instrumentation

326
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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High-Performance Liquid Chromatography: Elution Process01:05

High-Performance Liquid Chromatography: Elution Process

627
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...
627

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Large-scale Top-down Proteomics Using Capillary Zone Electrophoresis Tandem Mass Spectrometry
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In-line sample concentration in capillary electrophoresis by cyclodextrin to admicelle microextraction.

Andaravaas Patabadige Jude P Vaas1, Raymond B Yu1,2, Joselito P Quirino3

  • 1Australian Centre for Research On Separation Science (ACROSS), School of Natural Sciences-Chemistry, University of Tasmania, Private Bag 75, Hobart, TAS, 7001, Australia.

Analytical and Bioanalytical Chemistry
|August 17, 2022
PubMed
Summary

Cyclodextrins enable a new in-line sample concentration technique for capillary electrophoresis. This method, cyclodextrin to admicelle microextraction, significantly enhances sensitivity for analyzing anionic analytes in complex matrices like urine.

Keywords:
Capillary zone electrophoresisCyclodextrinElectroosmotic flowMicroextractionPseudophaseSample concentration

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Area of Science:

  • Analytical Chemistry
  • Separation Science

Background:

  • Capillary Zone Electrophoresis (CZE) is a powerful separation technique.
  • In-line sample pre-concentration is crucial for improving CZE sensitivity.
  • Pseudophase-to-pseudophase microextraction (P²ME) offers novel extraction mechanisms.

Purpose of the Study:

  • To introduce and validate a novel in-line sample concentration technique for CZE.
  • To develop a cyclodextrin (CD) to admicelle microextraction (ME) method for enhanced analyte detection.
  • To assess the efficiency and applicability of CD to admicelle ME for anionic analytes.

Main Methods:

  • Development of a CD to admicelle ME mode within CZE.
  • Utilizing cetyltrimethylammonium bromide (CTAB) admicelles for analyte trapping on the capillary surface.
  • Employing cyclodextrins to release analytes and achieve concentration.
  • Optimization of CD concentration, sample injection time, and injection ratio.
  • Analysis of five model anionic analytes and artificial urine samples.

Main Results:

  • Achieved sensitivity enhancement factors (SEFs) between 112 and 168 for model anionic analytes.
  • Demonstrated SEFs comparable to time-consuming off-line microextraction techniques.
  • Obtained excellent linearity (R² ≥ 0.999) and low limits of quantification (0.0125–0.05 µg/mL).
  • Showcased good intra- and inter-day repeatability (1.5–4.8%).
  • Successfully applied the method to the analysis of artificial urine samples.

Conclusions:

  • CD to admicelle ME is an effective in-line sample concentration technique for CZE.
  • The method offers significant sensitivity improvements for anionic analytes.
  • It provides a rapid and efficient alternative to traditional off-line extraction methods.
  • The technique shows promise for the analysis of real-world samples, including biological fluids.