Jastine powerpoint (chromatography)
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Chromatography
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Adsorption Chromatography
Adsorption chromatography is probably one of the oldest types ofchromatography around. It utilizes a mobile liquid or gaseous phase thatis adsorbed onto the surface of a stationary solid phase. The equilibriationbetween the mobile and stationary phase accounts for the separation ofdifferent solutes.
Partition Chromatography
This form of chromatography is based on a thin film formedon the surface of a solid support by a liquid stationary phase.Solute equilibriates between the mobile phase and thestationary liquid.
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Molecular Exclusion Chromatography
Also known as gel permeation or gel filtration, this type ofchromatography lacks an attractive interaction between thestationary phase and solute.
Ion Exchange Chromatography
In this type of chromatography, the use of a resin (thestationary solid phase) is used to covalently attach anions orcations onto it. Solute ions of the opposite charge in themobile liquid phase are attracted to the resin by electrostaticforces.
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Affinity Chromatography
This is the most selective type of chromatography employed.It utilizes the specific interaction between one kind of solutemolecule and a second molecule that is immobilized on astationary phase. For example, the immobilized molecule maybe an antibody to some specific protein. When solutecontaining a mixture of proteins are passed by this molecule,only the specific protein is reacted to this antibody, binding itto the stationary phase. This protein is later extracted bychanging the ionic strength or pH.
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Applications of CHROMATOGRAPHY
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