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How does chromatography differ from electrophoresis?
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chromatography
Overview of the chemical technique of chromatography.
While both chromatography and electrophoresis are techniques used to separate components of a mixture based on differential migration, they differ fundamentally in their driving forces and mechanisms.1
- Driving Force: In chromatography, the separation is driven by a moving fluid stream (the mobile phase) that transports solutes through a stationary phase. In contrast, electrophoresis relies on an electric field to exert forces on solutes based on their ionic charge.123
- Resistive Force: Chromatography separation is determined by the solute's affinity for the stationary phase relative to the mobile phase. In electrophoresis, the resistive force is provided by the viscosity of the nonflowing solvent.12
Essentially, chromatography separates substances based on their distribution between two phases, whereas electrophoresis separates charged particles based on their mobility within an electric field. Both are widely used in biochemical research for the analysis and purification of biological substances.132