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  • 1
    Electronic Resource
    Electronic Resource
    An HPLC fluorescence detection system for amines (1979)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 2 (1979), S. 11-14 
    Details
    ISSN: 0935-6304
    Keywords: Liquid chromatography ; Fluorescence ; Ion-pair extraction ; Amines ; Post-column reaction ; Auto-analyser ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A detection system is described which is based on fluorescent ion-pair formation between tertiary amine drugs and dimethoxyanthracene sulphonate. A dynamic micro-extraction principle is then used to isolate the ion-pairs from the excess reagent. The band broadening of this extraction detector was kept below 20% using standard auto-analyser equipment. With the enhanced selectivity and sensitivity of this approach it was possible to analyse chloropheniramine in urine at ppb concentrations using a pre-column clean-up trace enrichment step.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240020106
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The use of chemically bonded stationary phases in HPTLC (1979)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 2 (1979), S. 79-81 
    Details
    ISSN: 0935-6304
    Keywords: Thin Layer Chromatography TLC ; Chemically bonded C8 on precoated HPTLC plates tested 6 dialcylphthalates used as test substances ; 15-20% (v/v) water in organic solvents, upper practical limit as mobile phase composition ; 11-50 min migration time for linear TLC, 50 mm height ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240020210
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Liquid chromatographic trace enrichment with on-line capillary gas chromatography for the determination of organic pollutants in aqueous samples (1987)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 10 (1987), S. 17-24 
    Details
    ISSN: 0935-6304
    Keywords: Coupled LC-GC ; Retention gap ; LC trace enrichment ; Aqueous samples ; Organic pollutants ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Trace enrichment for the GC analysis of a series of chlorinated pesticides and polychlorinated biphenyls (PCBs) in aqueous samples has been achieved through a simple on-line technique involving sorption on an LC micro-precolumn followed by direct elution into a gas chromatograph with hexane. A 5-m retention gap coupled to the capillary GC column served as the recipient of a relatively large sample volume (ca. 100 μl) introduced into the GC. Partially concurrent solvent evaporation during sample introduction allowed a large sample capacity. Recoveries of more than 95% were observed for the majority of the compounds studied. Using 1.0 ml aqueous samples, detection limits of less than 1 ppt were found. The applicability of the developed method was demonstrated for a river water sample.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240100104
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Coupling of column liquid chromatography and thermospray mass spectrometry via phase-system switching with an ion-exchange trapping column (1992)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 21 (1992), S. 305-314 
    Details
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A benzenesulphonic acid-type cation exchanger (pKa 〈 1) is used as trapping-column material in a phase-system switching for the on-line coupling of column liquid chromatography and thermospray mass spectrometry. Phase-system switching is used to remove non-volatile constituents from the mobile phase, so that eluents containing non-volatile buffers and ion-pairing agents can be used without contaminating the mass spectrometer. The total analytical system is optimized using four benzalkonium test compounds (quaternary ammonium compounds). The reversed-phase separation of the test compounds as well as the parameters involved in the sorption on and desorption from the trapping column are studied. Important parameters during sorption are the concentration of the phosphate buffer and the percentage of acetonitrile in the mobile phase. During desorption of the test compounds from the ion-exchanger the percentage of acetonitrile in the desorption eluent and the pH are the most important factors. As an example, the analysis of domiphen in nasal drops is shown.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200210607
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    On-line post-column Diels-Alder derivatization for the determination of vitamin D3 and its metabolites by liquid chromatography/thermospray mass spectrometry (1993)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 22 (1993), S. 621-632 
    Details
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Liquid chromatography/thermospray mass spectrometry (LC/TSP MS) has been used for the determination of vitamin D3 and some of its metabolites, i.e. 1α(OH) vitamin D3, 25(OH) vitamin D3, 1α,25(OH)2 vitamin D3 and 24,25(OH)2 vitamin D3, using positive and negative ion detection. Using these two modes positional isomers can be identified. Detection in the negative ion mode was preferred because of the slightly higher sensitivity. The limits of detection, using multiple ion detection, are 50-100 nM (6-12 pmol injected). On-line post-column derivatization based on [4 + 2] cyclo-addition (Diels-Alder reaction) proceeds within 1 min at room temperature. If this step is included in LC/TSP MS, the detection limits of the analytes can be improved 7-70-fold depending on the analyte tested. The best results (detection limits down to 1 nM, i.e. 0.12 pmol injected) are obtained with discharge ionization in the negative ion mode.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200221102
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    The use of chemically bonded stationary phases in thin-layer chromatography-a surveyBased on a paper presented at the Second Intemational Symposium on Instrumental High Performance Thin Layer Chromatography, Interlaken, May 1982. (1982)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 5 (1982), S. 476-482 
    Details
    ISSN: 0935-6304
    Keywords: Thin-layer chromatography, TLC ; Reversed phase TLC ; Chemically bonded stationary phases ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: An overview is given of the literature publisned in the field of thin-layer chromatography on chemically bonded phases. Aspects which merit further attention are: quantitative analysis, organic solvent selection, stationary phase characteristics, surface modification of precoated silica plates, ion-pair chromatography and correlation of thin-layer and column chromatographic data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240050905
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  • 7
    Electronic Resource
    Electronic Resource
    Extraction of Metal Chloro Anions from aqueous chloride solutions using liquid anion-exchangers (1967)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 351 (1967), S. 73-80 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Bei der Extraktion von FeIII, ZnII, CdII, CoII und CuII aus wäßrigen Chloridlösungen durch Lösungen substituierter Ammoniumchloride oder hochmolekularer Aminhydrochloride in Toluol gehen die Metalle höchstwahrscheinlich als MIIICl4- bzw. MIICl42- Anionen in die organische Phase. Extraktionsversuche mit unverdünnten flüssigen Anionenaustauschern legen nahe, daß die gleichen Chloroanionen auch in der nichtwäßrigen Phase früher beschriebener chromatographischer Trennsysteme auftreten.
    Notes: An analysis has been made of the organic extracts obtained when Fe(III), Zn(II), Cd(II), Co(II) or Cu(II) are extracted from aqueous chloride solutions by substituted ammonium chlorides or high-molecular-weight amine hydrochlorides in toluene. It is shown that most probably the extracted species contain the M(III)Cl4- and M(II)Cl42- anions in all cases. Extraction experiments using undiluted liquid anion-exchangers strongly point to the presence of the same metal-containing anions in the non-aqueous phase of the chromatographic experiments previously described.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19673510111
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