Liquid chromatography, classification

However, not withstanding the above objections, further discussion of the Snyder solvent triangle classification method is justified by its common use in many solvent optimization schemes in liquid chromatography. The polarity index, P, is given by the sum of the logarithms of the polar distribution constants for ethanol, dioxane and nltromethane and the selectivity parameters, X, as the ratio of the polar distribution constant for solute i to... 

Scheme 4.4 Classification of liquid chromatography according to the retention mechanism. After Weston and Brown [365], Reprinted from A. Weston and P.R. Brown, HPLC and CE. Principles and Practice, Academic Press, Copyright (1997), with permission from Elsevier...

Liquid chromatography (LC) activated alumina applications, 2 400 adsorption, 1 610-611 of ascorbic acid, 25 760 basic principles, 4 603-606 classification of solvents for, 23 87... 

B. Berente, D.D.C. Garcia, M. Reichenbacher and K. Danzer, Method development for the determination of anthocyanins in red wines by high-performance liquid chromatography and classification of German red wines by means of multivariate statistical methods. J. ChromatogrA 871 (2000) 95-103. 

GLC see Gas-liquid chromatography Globally harmonized system (GHS), chemicals classification, 745-6 Global Ozone Monitoring Experiment (GOME), 605... 

Peracid Classification. Peracids can be broadly classified into organic and inorganic peracids, based on standard nomenclature. The limited number of inorganic peracids has required no subclassification scheme (4). However, the tremendous number of new organic peracids developed (85) has resulted in proposals for classification. For example, a classification scheme based on liquid chromatography retention times and critical micellization constants (CMC) of the parent acids has been proposed (89). The parent acids are used because of the instability of the peracids under chromatographic and micellization measurement conditions. This classification scheme is shown in Table 1. 

The future promise of HPLC is indicated by its classification as modern liquid chromatography when compared to other forms of column-liquid chromatography, now referred to as classical or traditional. Compared to the classical forms of liquid chromatography (paper, TLC, column), HPLC has several advantages ... 

Specific and essentially stand-alone mode of liquid chromatography is associated with the absence or suppression of any analyte interactions with the stationary phase, which is called size-exclusion chromatography (SEC). In SEC the eluent is selected in such a manner that it will suppress any possible analyte interactions with the surface, and the separation of the analyte molecules in this mode is primarily based on their physical dimensions (size). The larger the analyte molecules, the lower the possibility for them to penetrate into the porous space of the column packing material, and consequently the faster they will move through the column. The schematic of this classification is shown in Figure 1-1. 

R. Kaliszan,M. A. van Straten,M. Markuszewski, C. A. Cramers and H. A. Claessens, Molecular mechanism of retention in reversed-phase high-performance liquid chromatography and classification of modern stationary phases by using quantitative structure-retention relationships,/. Chromatogr. A 855 (1999),455-486. 

M. Euerby, A. McKeown, and R Petersson, Chromatographic classification and comparison of commercially available perfluorinated stationary phases for reversed-phase liquid chromatography using principal component analysis,/. Sep. 

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