Techniques of Chromatography

Chromatography was used for separation of yellow and green plant pigments, Chromatography has since evolved into a very general separation method for many types of mixtures.Chromatographic methods are essential in the analytical and preparative separation of biological samples. Gel filtration chromatography (size exclusion chromatography) is often the method of choice to purify macromolecules, taking advantage of their different sizes and shapes. Ion exchange chromatography is also useful for the separation of macromolecules, operating based on the various net charges on their surface, which can be tuned via the pH of the medium. Biological specificity in enzyme-substrate, enzyme-inhibitor, receptor-ligand, antigen-antibody (and other) interactions is utilised in affinity chromatography. In this method, one interaction partner is immobilised on a solid surface (stationary phase) and can selectively bind its interacting partner from a mixture in the mobile phase. The other components of the mixture can then be removed by replacing the mobile phase (washing). The pure material is then eluted by applying a mobile phase that disrupts the specific interaction.

  • Chromatographic bed shape techniques
  • Physical state of mobile phase techniques of Chromatography
  • Techniques by separation mechanism
  • Special techniques

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