Stationary chromatography

Ca.rhora.nes, These are used in neutron capture therapy (254), and as bum rate modifiers in gun and rocket propellants. They are used as high temperature elastomers and other unique materials, high temperature gas—Hquid chromatography stationary phases, optical switching devises (256), and gasoline additives (257). 

Poly crystalline silicon, 9 732 Poly [cyanopropylmethylf 14%)-dimethyl(86%)] siloxane, gas chromatography stationary phase, 4 617t... 

Polystyrene-co-butylacrylate, 7 608t Poly (styrene-co-divinylbenzene), 73 113 Poly(styrene-co-vinylpyridinium methyl iodide) ionomer system, 74 480 Poly(styrenedivinylbenzene) (PSDVB) liquid chromatography stationary phase, 4 623... 

Name of Chromatography Stationary Phase Mobile Phase Types of Compounds Amenable to Separation... 

Sunseri, J.D., Gedris, T.E., Stiegman, A.E., and Dorsey, J.G., Complete methylation of silica surfaces next generation of reversed-phase liquid chromatography stationary phases, Langmuir, 19, 8608, 2003. 

Sentell, K.B. and Dorsey, J.G, Retention mechanisms in reversed-phase chromatography. Stationary-phase bonding density and solute selectivity, J. Chromatogr., 461, 193, 1989. 

Lantz, A.W., Pino, V., Anderson, J.L., and Armstrong, D.W., Determination of solute partition behavior with room-temperature ionic liquid based micellar gas-liquid chromatography stationary phases using the pseudophase model, /. Chromatogr. A, 1115, 217-224, 2006. 

Baltazar, Q.Q., Leininger, S.K., and Anderson, J.L., Binary ionic liquid mixtures as gas chromatography stationary phases for improving the separation selectivity of alcohols and aromatics compounds, /. Chromatogr. A., 1182, 119-127, 2008. 

If the molecular masses of solutes are >2 000 and if they are soluble in organic solvents and their molecular diameter is >30 nm. Figure 25-14 tells us to try molecular exclusion chromatography.. Stationary phases for this type of separation are described in Chapter 26. If the molecular masses of solutes are >2 000, and they are soluble in water, but not ionic, and have diameters <30 nm, the decision tree says to use reversed-phase chromatography, or hydrophobic interaction chromatography. 

What does the designation 200/400 mesh mean on a bottle of chromatography stationary phase What is the size range of such particles (See Table 28-2.) Which particles are smaller, 100/200 or 200/400 mesh ... 

A typical SPE cartridge is displayed in Fig. 26. Sorbents are very similar to those for liquid chromatography stationary phase. The analyst can take advantage of the following... 

Fig.4.38. Separation of carboxylic acids by ion-pair chromatography. Stationary phase N,N-dimethyl-protriptyline, 0.036 M, pH 9.0 (30% on cellulose). Mobile phase cyclohexane-chloroform-1-pentanol (15 4 1). Mobile phase speed 2 mm/sec. Column 300 X 2.7 mm I.D. Peaks B benzilic acid (0.7 nmole) P = phenylbutyric acid (1.1 nmoles) S = salicylic acid (1.4 nmoles).

Sokoliess, T., Menyes, U., Roth, U., and Jira, T. (2002) Separation of Cis- and Trans-isomers of Thioxanthene and Dibenz[b,e]oxepin Derivatives on Calixarene- and Resorcinarene-bonded High-performance Liquid Chromatography Stationary Phases, J. Chromatogr. A 948, 309-319. 

Nguyen HP, Yang SH, Wigginton JG, Simpkins JW, Schug KA (2010) Retention behavior of estrogen metabolites on hydrophilic interaction chromatography stationary phases. J Sep Sci 33 793-802... 

OV-101 is a alkylpolysiloxane, a non-polar gas chromatography stationary phase, and C-20M a polyethylene glycol with a molecular weight of approximately 20,000 which is considered a polar gas chromatography stationary phase. 

Anderson, J.L. and Armstrong, D.W. 2005. Immobilized ionic liquids as high-selectivity/ high-temperature/high-stability gas chromatography stationary phases. Analytical Chemistry, 77 6453-62. 

J. Layne, Characterization and comparison of the chromatographic performance of conventional, polar-embedded, and polar-endcapped reversed-phase liquid chromatography stationary phases, /. Chromatogr. A 957, (2002), 149-164. 

There are growing numbers of reports indicating that chiral ionic liquids may be useful in many areas of science and technology, though synthesis and use of chiral ILs is in its infancy. For example, the use of ephedrinium-based chiral ILs (Fig. 5) as a gas chromatography stationary phase has been reported [12], Chiral ILs can be prepared either from chiral starting materials (Scheme lb) or using asymmetric synthesis (Scheme la) [13]. 

KB Sentell, JG Dorsey. Retention mechanisms in reversed-phase liquid chromatography stationary-phase bonding density and partitioning. Anal Chem 61 930-934, 1989. 

K. H. Enantioselective separation of racemic secondary amines on a chiral crown ether-based liquid chromatography stationary phase, J. Chromatogr. A, 2002,... 

The efficiency and selectivity of fuUerenes as adsorbents from aqueous solutions has resulted in a number of analytical applications of C g and C g as chromatography stationary phases, as chemical sensors and, especiaUy, as sorbents for the preconcentration of analytes. In the latter case, the adsorption properties of fuUerenes are more useful for inorganic and organometaUic compounds than for organic compounds. On the other hand, the fuUerenes exhibit a selectivity for aromatic compounds and planar molecules that makes them very attractive as stationary phases for liquid chromatography. 

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