Related Experiment Video
Updated: May 15, 2026
10:46
Size Exclusion Chromatography for Separating Extracellular Vesicles from Conditioned Cell Culture Media
Published on: May 13, 2022
Cyclodextrin-mediated enantioseparation in microemulsion electrokinetic chromatography
Claudia Borst1, Ulrike Holzgrabe
1Institute of Pharmacy and Food Chemistry, University of Würzburg, Würzburg, Germany.
Methods in Molecular Biology (Clifton, N.J.)
|January 4, 2013
Summary
This study introduces microemulsion electrokinetic chromatography with sulfated cyclodextrins for chiral separation of ephedrine derivatives. This advanced technique effectively resolves enantiomers and aids in impurity profiling.
Area of Science:
- Analytical Chemistry
- Separation Science
- Chiral Separations
Background:
- Cyclodextrins are traditionally used for chiral separations in capillary electrophoresis.
- Microemulsion electrokinetic chromatography (MEKC) is a novel technique offering unique separation capabilities.
Purpose of the Study:
- To develop and validate a chiral separation method using MEKC.
- To investigate the efficacy of sulfated cyclodextrins as a pseudostationary phase in MEKC for chiral analytes.
Main Methods:
- Utilized microemulsion electrokinetic chromatography with a specific microemulsion composition (SDS, 1-butanol, 2-propanol, ethylacetate, phosphate buffer).
- Incorporated sulfated beta-cyclodextrin as a secondary pseudostationary phase.
- Analyte partitioning between aqueous buffer and microemulsion phases facilitated enantiomeric separation.
Main Results:
- Successfully separated enantiomers of ephedrine derivatives using the developed MEKC method.
- Demonstrated the formation of transient diastereomeric complexes between enantiomers and cyclodextrins.
- The method proved effective for resolving a series of chiral phenethylamines.
Conclusions:
- Microemulsion electrokinetic chromatography with sulfated cyclodextrins is a viable method for chiral separations.
- This technique is suitable for enantiomeric excess determination and impurity profiling of chiral compounds.
More Related Videos
10:41Ion Exchange Chromatography (IEX) Coupled to Multi-angle Light Scattering (MALS) for Protein Separation and Characterization
Published on: April 5, 2019
06:28Single Step Isolation of Extracellular Vesicles from Large-Volume Samples with a Bifurcated A4F Microfluidic Device
Published on: February 2, 2024
Related Concept Videos
01:30Capillary 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,...
Capillary zone electrophoresis (CZE) separates ionic components based on their electrophoretic mobility. It has been used to separate proteins, amino acids,...
01:09Ion-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...
01:08Size-Exclusion Chromatography
In size-exclusion chromatography (SEC), also known as molecular-exclusion or gel-permeation chromatography, molecules are separated based on their sizes. This technique is important for separating large molecules such as polymers and biomolecules. The two classes of micron-sized stationary phases encountered in SEC are silica particles and cross-linked polymer resin beads. Both materials are porous, but their pore sizes vary significantly.
Silica particles offer advantages such as rigidity,...
Silica particles offer advantages such as rigidity,...
01:20Electrophoresis: 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...
There...
01:20Capillary 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...
02:30Racemic Mixtures and the Resolution of Enantiomers
A racemic mixture, or racemate, is an equimolar mixture of enantiomers of a molecule that can be separated using their unique interaction with chiral molecules or media. Racemic mixtures are denoted by the (±)- prefix. This ‘optical rotation descriptor’ applies to the whole solution of a racemic mixture rather than a specific stereoisomer. Enantiomers typically have the same physical and chemical properties. Hence, they are not easily separable. However, enantiomers can exhibit different...