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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...
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,...
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...
High-Performance Liquid Chromatography: Types of Detectors01:15

High-Performance Liquid Chromatography: Types of Detectors

The role of the detectors in High-Performance Liquid Chromatography (HPLC) is to analyze the solutes as they exit from the chromatographic column. The detector recognizes the solute's property and generates corresponding electrical signals, which are converted into a readable graph of the detector's response versus elution time called a chromatogram at the computer. There are several types of HPLC detectors, each with its own advantages and limitations, depending on the analyte properties and...
Ion-Exchange Chromatography01:09

Ion-Exchange Chromatography

Ion-exchange chromatography, or IEC, is a technique for separating ions based on their affinity for the stationary phase. The stationary phase is a cross-linked polymer resin with covalently attached ionic functional groups. The functional groups can be either positively charged (cation exchangers) or negatively charged (anion exchangers). A cation exchanger consists of a polymeric anion and active cations, while an anion exchanger is a polymeric cation with active anions. The choice of...

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Label-free Isolation and Enrichment of Cells Through Contactless Dielectrophoresis
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Published on: September 3, 2013

Contactless conductivity detection for electrophoretic microseparation techniques.

Thanh Duc Mai1, Peter C Hauser

  • 1University of Basel, Department of Chemistry, Spitalstrasse 51, 4056 Basel, Switzerland.

Chemical Record (New York, N.Y.)
|December 2, 2011
PubMed
Summary
This summary is machine-generated.

Capacitively coupled contactless conductivity detection offers unique advantages for electrophoretic separations by integrating ionic and electronic conduction. This method enables novel applications, including hydrodynamic pumping, not feasible with traditional UV detection.

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Area of Science:

  • Analytical Chemistry
  • Separation Science

Background:

  • Electrophoretic separations rely on ion movement in electric fields.
  • Contactless conductivity detection (CCD) is an advanced detection technique.

Purpose of the Study:

  • To discuss capacitively coupled contactless conductivity detection (C4D) for electrophoretic separations.
  • To highlight the integration of C4D with electrophoretic techniques.
  • To explore the unique aspects of C4D's interfacing with detector circuitry.

Main Methods:

  • Review of capacitively coupled contactless conductivity detection principles.
  • Discussion of fundamental mechanisms and historical context.
  • Analysis of the interface between ionic conduction in the measuring cell and electronic conduction in the detector.

Main Results:

  • C4D offers a unique approach to detecting ionic conduction in electrophoretic separations.
  • The intimate interfacing between the measuring cell and detector circuitry is crucial for C4D performance.
  • Hydrodynamic pumping is a novel feature enabled by C4D in capillary electrophoresis.

Conclusions:

  • Capacitively coupled contactless conductivity detection is a powerful technique for electrophoretic separations.
  • C4D provides capabilities, such as hydrodynamic pumping, beyond standard UV detection methods.
  • The method has a broad scope of applications in various analytical fields.