Stationary phases in chromatography

Aluminum oxide, A1203, is known almost universally as alumina. It exists with a variety of crystal structures, many of which form important ceramic materials (see Section 14.22). As a-alumina, it is the very hard, stable, crystalline substance corundum impure microcrystalline corundum is the purple-black abrasive known as emery. Some impure forms of alumina are beautiful, rare, and highly prized (Fig. 14.25). A less dense and more reactive form of the oxide is y-alumina. This form absorbs water and is used as the stationary phase in chromatography. 

Grushka G (ed) (1974) Bonded Stationary Phases in Chromatography. Ann Arbor Science, Ann Arbor, Mich. 

What is the difference between the mobile phase and the stationary phase in chromatography ... 

Stationary phase in chromatography, the porous solid or hquid phase through which an introduced sample passes. The different affinities the stationary phase has for a sample allow the components in the sample to be separated, or resolved. 

The first report of surface-immobilized dendrimers was in 1994 [54]. Subsequently, our research group showed that the amine-terminated PAMAM and PPl dendrimers could be attached to an activated mercaptoimdecanoic acid (MUA) self-assembled monolayer (SAM) via covalent amide linkages [55, 56]. Others developed alternative surface immobilization strategies involving metal com-plexation [10] and electrostatic binding [57]. These surface-confined dendrimer monolayers and multilayers have found use as chemical sensors, stationary phases in chromatography, and catalytic interfaces [41,56,58,59]. Additional applications for surface-confined dendrimers are inevitable, and are dependent only on the synthesis of new materials and the development of clever, new immobilization strategies. 

Coordination polymers can also play a useful role as stationary phases in chromatography (see Section 10.7.3.3). 

The solubility parameter may be used to characterize the overall polarity of compounds (solutes, mobile and stationary phases) in chromatography. It may also be used to predict the polarity (solvent strength) of mixtures (see section 3.2). 

Crown ethers as components of selective mobile and stationary phases in chromatography 93ZAK582. 

Polystyrene alone, or polystyrene having different degrees of crosslinking with divinylbenzene is commonly used in numerous copolymers with special purposes. Polymers used as stationary phases in chromatography may include groups such as C18 chains, pyridine, N-vinylpyrrolidone, or iminodiacetic acid groups. The structures of such copolymers are indicated below ... 

The stationary phase in chromatography is fixed in piace either in a column or on a planar surface. 

Stationary phase In chromatography, a solid or an immobilized liquid on which analyte species are partitioned during passage of a mobile phase. 

Advances in ILs have made synthesis of chiral ILs a subject of intense study in recent years.The popularity stems from the fact that it is possible to use chiral ILs as chiral solvents for optical resolutions, for asymmetric induction in synthesis and as chiral stationary phase in chromatography. It may also be possible to use chiral IL to replace the solvent as well as the added carbohydrate compound for tire enantiomeric purity determination method. Specifically, the chiral IL with its high solubility... 

Fig. 12 Scanning Electron Microscopy images of MIP used as stationary phase in chromatography (1) MIP particles obtained by grinding, grading and sedimentation (2) beads prepared by an emulsion process (from [114])...

Do the products have a functional group available for derivatization by a chiral or achiral reagent, or for interaction with a stationary phase in chromatography or with a chiral agent in solution ... 

For use as the stationary phases in chromatography, acidic, neutral and basic forms of alumina are commercially available. 

Bonded Stationary Phases in Chromatography Grushka, E., Ed. Ann Arbor Science Publishers Ann Arbor, MI, 1974. 

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