Results 211 to 220 of about 33,835 (260)
Some of the next articles are maybe not open access.
Retention mechanisms on metallic stationary phases
Journal of Chromatography A, 1989Abstract An electron-rich, porous graphitic carbon stationary phase for high-performance liquid chromatography has been shown to act as an electron-pair acceptor of solutes under non-polar conditions. The application of delocalized electron bands as chromatographic substrates was extended to other conductors, namely a palladium metal stationary phase,
Barbara J. Bassler +2 more
openaire +1 more source
Retention and selectivity of stationary phases for hydrophilic interaction chromatography
Journal of Chromatography A, 2011More and more polar stationary phases have become available for the separation of small polar compounds in the past decade as hydrophilic interaction chromatography (HILIC) continues to find applications in new fields (e.g., metabolomics and proteomics). Bare silica phases remain popular, especially in the bio-analytical area.
Yong, Guo, Sheetal, Gaiki
openaire +2 more sources
HPLC retention behavior on hydride‐based stationary phases
Journal of Separation Science, 2007AbstractTwo stationary phases attached to a silica hydride surface, cholesterol and bidentate C18, are investigated with a number of pharmaceutically related compounds in order to illustrate the various retention mechanisms that are possible for these bonded materials. The test solutes range from hydrophilic to hydrophobic based on log P (octanol/water
Joseph J, Pesek +2 more
openaire +2 more sources
Analytical Letters, 1997
Abstract A retention equation, , was developed to correlate the Kovats retention indices on polar stationary phases with that on non-polar stationary phases. Some differences of interaction forces of solutes on polar and non-polar stationary phases were taken into account.
Wenling Wang +3 more
openaire +1 more source
Abstract A retention equation, , was developed to correlate the Kovats retention indices on polar stationary phases with that on non-polar stationary phases. Some differences of interaction forces of solutes on polar and non-polar stationary phases were taken into account.
Wenling Wang +3 more
openaire +1 more source
Temperature effects on solute retention for hydride‐based stationary phases
Journal of Separation Science, 2007AbstractThe effect of solute retention is investigated for two hydride‐based stationary phases: bidentate C18 and cholesterol. Several small molecules and peptides are used as solutes. In the reversed‐phase mode, most compounds have the expected temperature behavior, i. e. decreasing retention with increasing temperature.
Joseph J, Pesek +3 more
openaire +2 more sources
Thermodynamic and QSRR Modeling of HPLC Retention on Modern Stationary Phases
Journal of Liquid Chromatography & Related Technologies, 2014This paper investigates correlations between the standard chromatographic parameter, log kw, obtained experimentally (classical thermodynamic) and obtained through the use of quantitative structure-retention relationships (QSRR) models (extrathermodynamic approach).
Kaczmarek, Mateusz +4 more
openaire +1 more source
Retention of Ions on Nonporous Charged Stationary Phases
Analytical Chemistry, 2000The interactions between ion-exchange resins and counterions consist of several mechanisms, such as ion-pair formation between active sites and counterions, specific adsorption, solvation changes, and double-layer accumulation. The double-layer accumulation of ions, which is a typical nonstoichiometric mechanism, is an important factor governing ...
openaire +2 more sources
Isothermal retention indices on poly(3-cyanopropylmethylsiloxane) stationary phases
Journal of Chromatography A, 2009Experimental isothermal retention indices (I) at 348, 363, 378 and 393 K of 52 solutes of varied polarity on seven different poly(cyanopropylmethylsiloxane) stationary phases with cyanopropyl group percentages between 0% and 75% have been determined by a well-proven, accurate method.
Ana María, Tello +3 more
openaire +2 more sources
Retention process in reversed phase TLC systems with polar bonded stationary phases
Journal of Separation Science, 2005AbstractThe retention of a solute in RP chromatography is a very complex process which depends on many factors. Therefore, the study of the influence of a mobile phase modifier concentration on the retention in different reversed phase chromatographic systems is very important for understanding the rules governing retention and mechanisms of substance ...
Wojciech, Zapała +1 more
openaire +2 more sources
Retention processes on α1-acid glycoprotein-bonded stationary phase
Journal of Chromatography A, 1992Stereoselective separations of charged enantiomers on CHIRAL-AGP can be controlled by varying the pH and adding charged and uncharged additives to the mobile phase. The interaction with the selector, alpha 1-acid glycoprotein, was studied by monitoring the effects of the variables on retention and by indirect detection, in part using a simple ...
E, Arvidsson, S O, Jansson, G, Schill
openaire +2 more sources