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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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Extraction: Advanced Methods00:56

Extraction: Advanced Methods

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Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
446
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,...
393
Electrophoresis: Overview01:20

Electrophoresis: Overview

2.0K
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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Ion-Exchange Chromatography01:09

Ion-Exchange Chromatography

450
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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Dialysis01:15

Dialysis

645
Dialysis is a diffusion-based purification process that separates analyte molecules from a complex matrix. This is accomplished by allowing molecules in the solution to pass through a semipermeable membrane into a liquid on the other side. The membrane is usually made of cellulose acetate or cellulose nitrate, and the second liquid must be miscible with the solution. Ions (e.g., chloride or sodium) or organic molecules (e.g., glucose) can pass through the membrane pores, which generally have...
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Conductive vial electromembrane extraction - Principles and practical operation.

Maria Schüller1, Frederik André Hansen1, Tonje Gottenberg Skaalvik1,2

  • 1Department of Pharmacy University of Oslo, Blindern Oslo Norway.

Analytical Science Advances
|May 8, 2024
PubMed
Summary
This summary is machine-generated.

Electromembrane extraction (EME) is a green microextraction technique offering high selectivity for charged analytes. This tutorial explains EME principles and practical application, aiding method development and operation.

Keywords:
conductive vial electromembrane extractionmicroextractionsample preparationtutorial

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Area of Science:

  • Analytical Chemistry
  • Separation Science
  • Green Chemistry

Background:

  • Electromembrane extraction (EME) is a selective microextraction technique.
  • It utilizes an electric field to drive charged analytes across a liquid membrane.
  • EME is recognized for its environmental friendliness and high selectivity.

Purpose of the Study:

  • To provide a tutorial on the principles and practical aspects of Electromembrane Extraction (EME).
  • To guide readers in method development and operation of EME systems.
  • To highlight common pitfalls and best practices in EME.

Main Methods:

  • Charged analytes are extracted from an aqueous sample.
  • Extraction occurs through a liquid membrane into an aqueous acceptor.
  • An external electric field controls analyte transport, selectivity, and efficiency.

Main Results:

  • EME offers high selectivity, tunable by electric field parameters, membrane composition, and pH.
  • Commercial prototype equipment is now available, increasing interest in EME.
  • The tutorial provides foundational knowledge for effective EME implementation.

Conclusions:

  • EME is a powerful and green analytical technique for charged analytes.
  • Understanding EME principles is crucial for successful method development and operation.
  • This tutorial serves as a valuable resource for researchers new to EME.