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  • 1
    Electronic Resource
    Electronic Resource
    Synthesis and evaluation of selective reversed phase packing materials for HPLC (1986)
    Springer
    Chromatographia 21 (1986), S. 392-396 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Bonded phases ; Specific selectivity ; Polynuclear aromatic hydrocarbons
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A method for preparing selective phases for reversed phase chromatography is described. Five different polymeric modified silica gel phases were prepared by simultaneously bonding with silanes, the first phase one line is missing according to the manuscript should read: the first phase being modified with ODS. Modification of the other four phases was achieved by treatment with ODS and cyanopropyl- or cyanodecyl-trichlorosilane, thus yielding reversed phase materials of different properties. The chromatographic selectivity of each phase was demonstrated by elution of a number of standard mixtures containing polyaromatic compounds. The selectivity is described with respect to carbon load and the ODS/CN-ratio of the stationary phase for these compounds. Different PAHs are influenced to a greater or lesser degree. Through introduction of various functional groups in the network of C18 chains of a polymeric modified silica gel, it is possible to design columns with specific selectivities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02346138
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  • 2
    Electronic Resource
    Electronic Resource
    Modification of HPTLC-plates by in situ chemical bonding with non-polar and polar organosilanes (1980)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 3 (1980), S. 345-350 
    Details
    ISSN: 0935-6304
    Keywords: Thin-layer chromatography, HPTLC ; Chemical modification of HPTLC-plates ; Organosilanes, polar and non-polar ; Zwitter character of modified silica surface ; Advantageous separation through plate modification ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A method has been developed for the preparation of modified silica plates for high performance thin-layer chromatography (HPTLC). Some typical organosilanes were thus allowed to react in situ with the silica of Merck HPTLC-plates. This method was found to be highly reproducible, simple and cheap. Non-polar plates were prepared and compared with commercial plates from Merck, Whatman and Macherey-Nagel. Modification with cyanodecyltrichlorosilane resulted in plates that showed good coverage, efficiency and low residual silica activity. Silica modified with a multifunctional silane has different properties in different organic solvents. It will appear to be non-polar in a polar solvent and vice versa. New advantageous separation systems are thus made feasible by the presence of cyano groups on the plate.The utility of modified thin-layer plates is demonstrated by the separation of some homologues of p-hydroxybenzoic acid esters and of some polycyclic aromatic hydrocarbons.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240030707
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