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Related Concept Videos

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.
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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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A number of natural and synthetic materials exhibit selective permeation, meaning that only molecules or ions of a certain size, shape, polarity, charge, and so forth, are capable of passing through (permeating) the material. Biological cell membranes provide elegant examples of selective permeation in nature, while dialysis tubing used to remove metabolic wastes from blood is a more simplistic technological example. Regardless of how they may be fabricated, these materials are generally...
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Electrophoresis: Overview01:20

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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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Transport Number01:31

Transport Number

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The transport number is the fraction of the total current carried by an ion in an electrolyte solution. It is defined as the ratio of the current carried by a specific ion to the total current flowing through the solution. The transport number, t, is central to understanding ionic mobility, which describes how fast an ion moves under the influence of an electric field. This link connects the physical behavior of ions in solution to the chemical processes that occur during electrochemical...
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Extraction: Advanced Methods00:56

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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...
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Related Experiment Video

Updated: Apr 1, 2026

Author Spotlight: Optimizing Hollow-Fiber Membranes for Continuous Liquid-Liquid Extraction of Medium-Chain Fatty Acids
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Mass transfer in electromembrane extraction--The link between theory and experiments.

Chuixiu Huang1,2, Henrik Jensen3, Knut Fredrik Seip1

  • 1School of Pharmacy, University of Oslo, Oslo, Norway.

Journal of Separation Science
|October 1, 2015
PubMed
Summary

Electromembrane extraction (EME) is a novel sample preparation technique for charged analytes. This review details mass transfer principles in EME, enhancing scientific understanding of this hybrid electrokinetic and liquid-liquid extraction method.

Keywords:
Electromembrane extractionMass transferMicroextractionSample preparation

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Area of Science:

  • Analytical Chemistry
  • Separation Science
  • Electrochemistry

Background:

  • Electromembrane extraction (EME) introduced in 2006 is a sample preparation technique for charged analytes in aqueous samples.
  • EME utilizes electrokinetic migration through a supported liquid membrane into a small acceptor volume under an electrical field.
  • Applications include extraction of drugs, amino acids, peptides from biological fluids, and micropollutants from environmental samples, often coupled with chromatography or mass spectrometry.

Purpose of the Study:

  • To review recent advancements in describing the fundamental mass transfer principles of electromembrane extraction.
  • To provide an updated understanding of the processes involved in EME.
  • To address the need for detailed mass transfer descriptions for broader scientific acceptance.

Main Methods:

  • Review of approximately 125 published research papers on electromembrane extraction.
  • Analysis of fundamental principles governing mass transfer in EME.
  • Synthesis of current understanding of EME processes.

Main Results:

  • Electromembrane extraction is a hybrid of electrophoresis and liquid-liquid extraction.
  • Fundamental mass transfer principles in EME have been partially investigated.
  • Recent research efforts focus on elucidating these mass transfer mechanisms.

Conclusions:

  • Further detailed investigation into mass transfer is crucial for the scientific validation of electromembrane extraction.
  • A comprehensive understanding of EME's fundamental principles will foster wider adoption.
  • This review consolidates current knowledge on EME mass transfer, paving the way for future research.