Sephadex Sephadex is a cross-linked dextran gel used for gel filtration . It was launched by Pharmacia in 1959, after development work by Jerker Porath and Per Flodin . The name is derived from se paration Pha rmacia dex tran. It is normally manufactured in a bead form and most commonly used for gel filtration columns . By varying the degree of cross-linking, the fractionation properties of the gel can be altered. These highly specialized gel filtration and chromatographic media are composed of macroscopic beads synthetically derived from the polysaccharide dextran. The organic chains are cross-linked to give a three-dimensional network having functional ionic groups attached by ether linkages to glucose units of the polysaccharide chains. Available forms include anion and cation exchangers, as well as gel filtration resins, with varying degrees of porosity; bead sizes fall in discrete ranges between 20 and 300 µm . Sephadex is also used for ion-exchange chromatography .Applications Sephadex is used to separate molecules by molecular weight . Sephadex is a faster alternative to dialysis, requiring a low dilution factor, with high activity recoveries. Sephadex is also used for buffer exchange and the removal of small molecules during the preparation of large biomolecules, such as ampholytes , detergents, radioactive or fluorescent labels, and phenol . A special hydroxypropylated form of Sephadex resin, named Sephadex LH-20, is used for the separation and purification of small organic molecules such as steroids, terpenoids, lipids. An example of use is the purification of cholesterol.Fractionation Exclusion chromatography . Fractionation Range of Globular Proteins and Dextrans.Ion-exchange chromatography.Description Functionality Bead size Sephadex-CM C-25 carboxymethyl 40-120 Sephadex-CM C-50 carboxymethyl 40-120 Sephadex-DEAE A-25 2-ethyl 40-120 Sephadex-DEAE A-50 2-ethyl 40-120 Sephadex-QAE A-25 quaternary aminoethyl40-120 Sephadex-QAE A-50 quaternary aminoethyl 40-120 Sephadex-SP C-25 sulfopropyl 40-120 Sephadex-SP C-50 sulfopropyl 40-120
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