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  • 1
    Electronic Resource
    Electronic Resource
    Use of a displacement model for solvent sorption to study non-specific selectivity in reversed-phase liquid chromatography (1991)
    Springer
    Chromatographia 32 (1991), S. 13-18 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Alkyl bonded phases ; Non-specific selectivity ; Hydro-organic mobile phases ; Retention of alkanoate esters
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A thermodynamic equation is derived for the non-specific selectivity of alkyl bonded phases as a function of the mobile phase composition using a displacement mechanism to model the sorption of solvents into the bonded phase. The equation is used to calculate the thermodynamic parameters which characterize the incremental behavior of a hydrophobic group in ethyl alkanoate and methyl perfluoroalkanoate ester solutes chromatographed with water-methanol and water-acetonitrile mobile phases on both octyl and octadecyl bonded phases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02262459
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  • 2
    Electronic Resource
    Electronic Resource
    Dependence of the methylene selectivity on the composition of hydro-organic eluents for reversed-phase liquid chromatographic systems with alkyl bonded phases (1990)
    Springer
    Chromatographia 30 (1990), S. 393-399 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Alkyl bonded phases ; Hydro-organic mobile phases ; Methylene selectivity ; Stationary phase composition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A theoretical treatment is presented which considers differences between the composition of the mobile phase and solvents that are incorporated into the bonded phase via preferential sorption. Equations are derived and used to analyze retention data for various homologs chromatographed under reversed-phase conditions using alkyl bonded phases and combinations of water-methanol, water-acetonitrile and watertetrahydrofuran as mobile phases. In the case of water-methanol the surface phase and bulk mobile phase compositions are similar. However, significant differences in composition between the two phases are observed when binary combinations of water-acetonitrile and water-tetrahydrofuran are used as the cluents.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02328504
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  • 3
    Electronic Resource
    Electronic Resource
    Chromatographic and related studies of alkylamide phases (1994)
    Springer
    Chromatographia 39 (1994), S. 155-161 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Chemically bonded phase (CBP) ; Alkylamide phase ; Surface characterization ; Thermal stability ; Packings evaluation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A series of chemically bonded phases has been prepared with amide groups localized by means of hydrophobic ligands. The physicochemical and chromatographic properties of such phases with chain lengths ranging from C5 to C8 have been examined by porosimetry, elemental analysis, solid-state NMR, and liquid chromatography. Subsequently, the conformational dynamics of these phases have been investigated by analyzing the dependence of the capacity factor (k) on the reciprocal of temperature for different organic compounds. Special emphasis has been given to the reproducibility of retention data obtained before and after temperature-dependent measurements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02274494
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