Results 151 to 160 of about 137,428 (211)
Some of the next articles are maybe not open access.
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
Retention of β blockers on native titania stationary phase
Journal of Separation Science, 2011AbstractIn recent years, metal oxides such as titania have been commercially available as chromatographic beds that can potentially be used to achieve novel separations of polar compounds. For example β blockers, which are more often encountered in environmental sciences, have a wide range of polarity, and their basic character leads to difficult ...
El Debs, Racha +4 more
openaire +4 more sources
Isothermal retention indices on poly(3,3,3-trifluoropropylmethylsiloxane) stationary phases
Journal of Chromatography A, 2007Isothermal retention indices (I) of 56 solutes of varied chemical nature and polarity were determined by a well-proven accurate method on poly(3,3,3-trifluoropropylmethylsiloxanes) with trifluoropropyl group percentages between 0 and 50% within the 353-413 K temperature range.
Rosa, Lebrón-Aguilar +3 more
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 characteristics of a new butylimidazolium-based stationary phase
Analytical and Bioanalytical Chemistry, 2005A new HPLC stationary phase has been synthesized based on the ionic liquid n-butylimidazolium bromide. Imidazolium was covalently immobilized on a silica substrate through an n-alkyl tether and the retention characteristics of the resulting stationary phase were evaluated systematically.
Y, Sun +4 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
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
Riboflavin binding protein—Chiral stationary phase: Investigation of retention mechanism
Chromatographia, 2002The chiral recognition mechanism of Riboflavin Binding Protein (RfBP) stationary phase has been investigated by studying the influence of temperature on the retention process.
CALLERI, ENRICA +5 more
openaire +2 more sources
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
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