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Mechanism for the Separation of Large Molecules Based on Radial Migration in Capillary Electrophoresis
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posted on 2003-07-02, 00:00 authored by Jinjian Zheng, Edward S. YeungWe demonstrate a novel separation mechanism for large
molecules based on their radial migration in capillary
electrophoresis with applied hydrodynamic flow (HDF).
The direction of radial migration depends on the direction
of the applied HDF relative to the electric field. The radial
migration velocities are size-dependent, which could be
attributed to the different degree of deformation under
shear flow. Analytical separation was demonstrated on a
sample plug containing λ DNA (48 502 bp) and φX174
RF DNA (5386 bp) with baseline separation. Alternatively, this separation mode can be performed continuously and is thus applicable to preparative separations.
Without the need for gel/polymer or complex instrumentation, this separation technique is complementary to
capillary gel electrophoresis and field-flow fractionation.
Although large DNA molecules were used to demonstrate
the separation mechanism here, these protocols could
also be applied to the separation of proteins, cells, or
particles based on size, shape, or deformability.
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- Biophysics
- Biochemistry
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Keywords
separation techniqueRadial Migrationcapillary gel electrophoresisLarge Moleculesseparation mechanismbaseline separationRFsample plugcapillary electrophoresisnovel separation mechanismseparation modemigration velocitiesHDFDNA moleculeshydrodynamic flowCapillary ElectrophoresisAnalytical separationshear flow
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