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Liquid chromatography chromatographic material

Stella, C., Rudaz, S., Veuthey, J. L, Tchapla, A. Silica and other materials as supports in liquid chromatography. Chromatographic tests and their importance for evaluating these supports. Part 1. Chromatographia 2001, 53, S-113-S-131. [Pg.351]

Heilman, M. Y., in Chromatographic Science Series, Vol. 8, Liquid Chromatography of Polymers and Related Materials, J. Cazes, ed., Dekker, New York, 1977, p. 29. [Pg.106]

Gas-chromatographic determination for plant materials liquid chromatography/mass spectrometric determination for water and soil... [Pg.1177]

It was known from gas chromatographic theory that efficiency could be improved if the particle size of the stationary phase materials used in lc could be reduced. High performance liquid chromatography developed steadily during the late 1960s as these high efficiency materials were produced, and as improvements in instrumentation allowed the full potential of these materials to be realised. As hplc has developed, the particle size of the stationary phase used has... [Pg.17]

FIGURE 9.1 Liquid chromatography workflow strategy options in proteomics. (a) bottom-up approach (b) top-down approach (c) selective sample cleanup directly combined with chromatographic separation (d) peptide capture with affinity restricted access material. [Pg.208]

One of the most powerful methods for determining enantiomer composition is gas or liquid chromatography, as it allows direct separation of the enantiomers of a chiral substance. Early chromatographic methods required the conversion of an enantiomeric mixture to a diastereomeric mixture, followed by analysis of the mixture by either GC or HPLC. A more convenient chromatographic approach for determining enantiomer compositions involves the application of a chiral environment without derivatization of the enantiomer mixture. Such a separation may be achieved using a chiral solvent as the mobile phase, but applications are limited because the method consumes large quantities of costly chiral solvents. The direct separation of enantiomers on a chiral stationary phase has been used extensively for the determination of enantiomer composition. Materials for the chiral stationary phase are commercially available for both GC and HPLC. [Pg.26]

To increase Vs, the chromatographer can increase the surface area of the stationary phase materials in normal-phase liquid chromatography, increase the stationary phase volume in reversed-phase or partition liquid chromatography, or increase the ion-exchange capacity in ion-exchange liquid chromatography. In general, if the internal diameter of a column is constant, the retention time... [Pg.99]

Enthalpy can be measured by liquid chromatography where enthalpy is a slope of the relationship between In k and the inverse value of the absolute temperature. A schematic diagram is shown in Figure 6.7. The slope depends upon the solutes being retained by the same liquid chromatographic mechanism. An example is given in Table 6.4. The results, measured on an octadecyl-bonded vinyl alcohol copolymer gel, did not show a simple linear relationship. This is due to a conformation change of the octadecyl-bonded vinyl alcohol copolymer gel stationary phase material, which has a phase transition point at about 33 °C. [Pg.129]


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