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  • 1
    Electronic Resource
    Electronic Resource
    Reversed phase C18 packings for the separation of polycyclic aromatic hydrocarbons by high performance liquid chromatography (1994)
    Springer
    Chromatographia 39 (1994), S. 668-672 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Monomeric and oligomeric RP packings ; Preparation of RP stationary phases ; Polycyclic aromatic hydrocarbons
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The preparation of C18 stationary phases for the separation of polycyclic aromatic hydrocarbons has been investigated. The effect of the pore size of the silica, the endcapping procedure, the amount of reagent and the amount of water in the preparation was also examined. A good correlation between surface coverage and capacity factor was found. The maximum surface coverage available with our preparation method lies between 3–3.5 μmol m−2, slightly depending on the pore size of the silica. Oligomeric not endcapped C18 packing materials are optimal for the separation of polycyclic aromatic hydrocarbons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02274581
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Polymer coated stationary phases for liquid chromatography (1989)
    Springer
    Chromatographia 28 (1989), S. 19-23 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Preparation of stationary phases ; Polymer coated stationary phases ; Polymer-octyl bonded phase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Polymethyloctylsiloxane-coated stationary phases have been prepared for liquid chromatography, by thermal reaction. The influence of the reaction conditions on retention and efficiency of test substances with different structures has been discussed. The materials have good stability in both acidic and basic eluents.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02290376
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Rapid separation of some antiepileptic drugs in serum by HPLC (1991)
    Springer
    Chromatographia 32 (1991), S. 85-86 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Antiepileptic drugs ; Optimised separation ; Serum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A fast and easy, iscratic high-performance liquid chromatographic method for the simultaneous determination of primidone, phenobarbital, phenytoin, carbamazepine and thiobutabarbital from serum samples has been developed. The optimal eluent composition is 36% acetonitrile, 24% methanol and 40% phosphate buffer. Using a programmable wavelength detector very low (sub-therapeutic) levels of the drugs can be measured.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02262474
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Chromatographic packings made by solide phase synthesis (1987)
    Springer
    Chromatographia 23 (1987), S. 254-256 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Synthesis of stationary phases ; Influence of surface pH ; Influence of temperature, concentration and reaction ; time
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A new way to produce liquid chromatographic stationary phases is suggested. The method is based upon a solide-phase reaction between the silica surface and the adsorbed silane molecules. The role of surface pH is demonstrated. The influence of other reaction conditions (concentration of the silane solution, effect of temperature and reaction time) is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02311774
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Selectivity of some aromatic compounds and carotenoids on C18 packings made with different endcapping procedures (1990)
    Springer
    Chromatographia 30 (1990), S. 318-322 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Monomeric and polymeric phases ; Endcapping ; Carotenoids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Monomeric and polymeric reversed-phase (C18) column packing materials have been prepared for HPLC. Columns have been tested with aromatic hydrocarbons, acidic and basic solutes. Good separation of carotenoids can be achieved on well-endcapped phases, but at the separation of some pairs (e.g. carotenoids with ∈-and β-endgroups) nonendcapped materials give better resolution. The influence of coating structure and that of endcapping have been discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02319715
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Isolation and characterization of 3,5,6-trihydroxy-carotenoids from petals ofLilium tigrinum (1998)
    Springer
    Chromatographia 48 (1998), S. 27-31 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Lilium tigrinum ; Carotenoids ; Xanthins
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Reinvestigation by HPLC of the petals ofLilium tigrinum and the isolation of some minor compounds is reported. Using HPLC-controlled, preparative-column chromatography, 5,6-diakarpoxanthin (6), 6-epikarpoxanthin (2), 5,6-diacapsokarpoxanthin (8), and 9Z-antheraxanthin (9Z-13) were isolated and characterized. Based on spectroscopic data the absolute configurations of6 and8 were identical with those originating from paprika, thus the 5,6-diakarpoxanthin (6) and 5,6-diacapsokarpoxanthin (8) have the 3S, 5S, 6S configuration and 6-epikarpoxanthin (2) has the 3S, 5R, 6S configuration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02467511
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    Paper (German National Licenses)
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