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Cellulose liquid chromatography analysis

Haworth methylation of methyl /3-D-glucopyranoside and its 4-benzyl and 4-(tetrahydropyran-2-yl) ethers was investigated in connection with partial-methylation studies on cellulose.267 For the unsubstituted glycoside, the ratios of relative rate-constants k2 k3 k4 k were estimated to be 8 2 1 8, and, for the 4-ethers, it was found that ke> k2> k3 best agreements between calculated and experimental yields were found with the assumption that the rate constant for reaction at HO-3 is doubled when HO-2 is substituted. Later methylation studies,268 performed to low degrees of substitution, with analysis by gas-liquid chromatography, gave k2> k4> k3 for the reactivity... [Pg.56]

Ion-exchange supports based on derivatized cellulose and agarose have been popular since the 1960s, particularly for protein analysis. For high-performance liquid chromatography (HPLC), less compressible supports, such as silica and cross-Unked polymers, are most commonly used. [Pg.869]

The scheme summarises all modern analytical and preparative chromatography protocols, such as high-performance liquid chromatography (HPLC) and gas-liquid chromatography (GLC), with all their conceivable variations. Reverse-phase HPLC or GLC , in which a non-polar liquid is adsorbed onto the solid - the stationary phase - is more appropriate for the analysis of mixtures of derivatives of amino acids and peptides. Cellulose in the above scheme would be replaced by a less-polar medium, such as acetylated cellulose, silanised silica gel, etc. in standard reversed-phase HPLC. [Pg.80]

Straka, R.J. Johnson, K.A. Marshall, P.S. Remmel, R.P. Analysis of metoprolol enantiomers in human serum by liquid chromatography on a cellulose-based chiral stationary phase. J.Chromatogr., 1990, 530, 83-93... [Pg.892]

In liquid chromatography greater efficiencies and faster analysis times have resulted from the use of smaller particle diameters, within the pressure limitations imposed by instrumentation and support materials. While HPLC has demonstrate improved column efficiencies due to the use of superior support properties, the low-pressure modihed-cellulose and liquid-coated materials have often shown superior selcctivities with regard to nu cleic acid compounds. [Pg.31]

Floyd [49] used two-dimensional SEC/reversed phase liquid chromatography in the analysis of additives in cellulose acetate. [Pg.158]

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See also in sourсe #XX -- [ Pg.39 ]



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