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How does reverse-phase chromatography separate substances?
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In reverse-phase chromatography, substances are separated based on their relative affinity for a nonpolar stationary phase and a polar mobile phase.12
The process functions through the following mechanisms:
- Stationary Phase: The surface of the stationary phase is nonpolar or hydrocarbon-like.2
- Mobile Phase: The mobile phase is typically a polar mixture, such as water combined with an organic solvent like methanol or acetonitrile.2
- Separation Principle: As the sample is transported through the column, components distribute themselves between the two phases based on their nonpolar characteristics. Substances interact more strongly with the nonpolar stationary phase if they are less polar, causing them to be retained longer.23
- Elution Order: Because of this interaction, substances are eluted from the column in order of increasing polarity—meaning more polar substances emerge first, while less polar (more hydrophobic) substances emerge later.2
This method is widely used in analytical chemistry for the separation of various organic substances, including peptides and other complex biological molecules.2