Results 141 to 150 of about 5,042,699 (188)
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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
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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
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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
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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
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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
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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 ...
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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
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Journal of Chromatography B: Analytical Technologies in the Biomedical and Life Sciences, 2017
The main goal of our work was to apply three different phenyl-bonded stationary phases in ion pair chromatography for the analysis of synthetic oligonucleotides of various sequences. The influence of the stationary phase structure and the impact of ion-pairing reagent concentration on the retention of oligonucleotides were tested.
Sylwia Studzińska +2 more
exaly +3 more sources
The main goal of our work was to apply three different phenyl-bonded stationary phases in ion pair chromatography for the analysis of synthetic oligonucleotides of various sequences. The influence of the stationary phase structure and the impact of ion-pairing reagent concentration on the retention of oligonucleotides were tested.
Sylwia Studzińska +2 more
exaly +3 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
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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
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Journal of Chromatography A, 2021
A 34-membered tetraazahexaphenylmacrocycle (N4Ph6) with a rigid π-conjugated moiety was chemically bonded to silica gel with 3-chloropropyltrimethoxysilane as the coupling agent to prepare a novel SiO2@N4Ph6 stationary phase. Several common organic analytes, including alkylbenzenes, polycyclic aromatic hydrocarbons, anilines, phenols, phthalates, and ...
Junnan, Li +6 more
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A 34-membered tetraazahexaphenylmacrocycle (N4Ph6) with a rigid π-conjugated moiety was chemically bonded to silica gel with 3-chloropropyltrimethoxysilane as the coupling agent to prepare a novel SiO2@N4Ph6 stationary phase. Several common organic analytes, including alkylbenzenes, polycyclic aromatic hydrocarbons, anilines, phenols, phthalates, and ...
Junnan, Li +6 more
openaire +2 more sources