Results 161 to 170 of about 137,428 (211)
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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
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Analytical Chemistry, 1989
The partitioning model of retention for reversed-phase liquid chromatography, described by mean-field statistical thermodynamic theory, asserts that one principal driving force for solute retention is the creation of a solute-sized cavity in the stationary phase. Beyond a critical stationary phase bonding density, increased grafted chain density should
K B, Sentell, J G, Dorsey
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The partitioning model of retention for reversed-phase liquid chromatography, described by mean-field statistical thermodynamic theory, asserts that one principal driving force for solute retention is the creation of a solute-sized cavity in the stationary phase. Beyond a critical stationary phase bonding density, increased grafted chain density should
K B, Sentell, J G, Dorsey
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Analytical Chemistry, 1992
The retention mechanism in reversed-phase liquid chromatography (RPLC) has been investigated by examining the temperature dependence of retention, with emphasis on the role of the stationary phase in the retention process. Both chromatographic temperature studies and differential scanning calorimetry were used to examine the role of alkyl chain bonding
L A, Cole, J G, Dorsey
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The retention mechanism in reversed-phase liquid chromatography (RPLC) has been investigated by examining the temperature dependence of retention, with emphasis on the role of the stationary phase in the retention process. Both chromatographic temperature studies and differential scanning calorimetry were used to examine the role of alkyl chain bonding
L A, Cole, J G, Dorsey
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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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Understanding Mixed-Mode Retention Mechanisms in Liquid Chromatography with Hydrophobic Stationary Phases [PDF]
Analytical Chemistry, 2014 The chromatographic retention mechanisms of two hydrophobic bonded phases, octadecyl ethyl-bridged organic/inorganic (BEH-C18) and straight-chain perfluorohexylpropyl silica (C6F13), have been investigated by using a homologous series of alkyl-benzenes and perfluoroalkyl acids as test compounds in a variety of acetonitrile/water mobile phases and at ...
CAVAZZINI, Alberto +6 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).
Mateusz Kaczmarek +4 more
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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
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Retention of long-chain acetylenic hydrocarbons on non-polar stationary phases
Journal of Chromatography A, 2009The retention indices of methyl and trimethylsilyl esters of octadeca-, eicosa- and tricosa-ynoic fatty acids containing acetylenic bonds were measured on non-polar stationary phase (dimethylsilicone with 5% phenyl groups). An unusually large increase in retention is observed for compounds containing conjugated and methylene interrupted acetylenic ...
K V, Tretyakov, V I, Babushok
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Journal of Separation Science, 2010
AbstractEstrogens and estrogen metabolites are important biological mediators of the endocrine system. They have also been implicated in detrimental carcinogenesis and beneficial neuroprotective processes. The retention behavior of estrogen metabolites was investigated on five polar stationary phases, used for hydrophilic interaction chromatography ...
Hien P, Nguyen +4 more
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AbstractEstrogens and estrogen metabolites are important biological mediators of the endocrine system. They have also been implicated in detrimental carcinogenesis and beneficial neuroprotective processes. The retention behavior of estrogen metabolites was investigated on five polar stationary phases, used for hydrophilic interaction chromatography ...
Hien P, Nguyen +4 more
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Gas chromatographic retention of alkyl phosphates on ionic liquid stationary phases
Journal of Chromatography A, 2013Retention behaviors of alkyl phosophates were studied on a series of ionic liquid gas chromatography columns. The selectivity of the IL columns for alkyl phosphates were compared with a 5% phenyl column as a route to evaluating the potential use of IL columns in the analysis of alkyl phosphates in petroleum samples in both one- and multi-dimensional GC.
Brandon M, Weber, James J, Harynuk
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