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  • 1
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Chirality 6 (1994), S. 25-40 
    ISSN: 0899-0042
    Keywords: Review ; capillary electrophoresis ; enantiomeric resolution ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The preconditions are outlined for enantioselective separations in capillary electrophoresis (CE) with chiral selectors as additives to the background electrolyte. Free solution capillary electrophoresis conditions are characterised by a single solution phase. Chiral separations are reviewed by selector type (chiral ligand exchange, cyclodextrins, crown ethers, glycoproteins) with the extensive studies on cyclodextrins grouped into sections on amino acids, pharmaceuticals, and speciality chemicals, optimisation, biological fluids, and quantitative aspects. In micellar electrokinetic capillary chromatography, enantioselective discrimination occurs by partition in a two-phase system, with a chiral micellar phase as selector. Optimum separation conditions can be readily predicted for a given selector-selectand combination, and absolute values of binding constants determined by CE. Advantages of CE in comparison with HPLC using a chiral stationary phase include robust, rapid assays and the use of small volumes of aqueous solutions; disadvantages include less favourable detection limits. © 1994 Wiley-Liss, Inc.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Electrophoresis 15 (1994), S. 808-817 
    ISSN: 0173-0835
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: The enantiomeric resolution of salbutamol and its chiral and achiral related impurites is investigated using capillary electrophoresis. The effects of nine varieties of cyclodextrin, cyclodextrin concentration and organic modifier concentration were studied in an attempt to resolve all possible analytes in a complex mixture of salbutamol-related solutes. Eleven components including three enantiomeric pairs were baseline resolved using 112 mM dimethyl-β-cyclodextrin at pH 2.5 in a citric acid/phosphate buffer. Both methanol and iso-propyl alcohol at up to 20% were found to have a deleterious effect on the separation. Binding constants and mobility values for the free and complexed forms for each solute were determined. The results are interpreted by considering the physical properties of the molecules under the conditions employed and a rationale proposed for the underlying basis for chiral and achiral selectivity.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Electrophoresis 15 (1994), S. 824-827 
    ISSN: 0173-0835
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: The separation and quantitation of enantiomers is an important application of capillary electrophoresis. This paper reviews the performance and validation of capillary electrophoretic methods for this application. Limits of detection of 〈 0.1% are shown for determinations of minor enantiomer levels. Application areas include enantiomeric purity testing of pharmaceuticals and herbicides, reaction rate monitoring, stability testing, and clinical analysis. It is concluded that the number of quantitative application areas will undoubtedly expand as capillary electrophoresis becomes more widely established as an alternative and complement to high-performance liquid chromatography.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 22 (1999), S. 55-58 
    ISSN: 0935-6304
    Keywords: Micellar electrokinetic capillary chromatography ; sample dissolving solvent ; 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
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 21 (1998), S. 193-196 
    ISSN: 0935-6304
    Keywords: capillary electrophoresis ; dissolving solvent selection ; optimization ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 0173-0835
    Keywords: Capillary electrophoresis ; Experimental design ; Optimisation ; Robustness ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Various chemometric experimental designs have been employed for the optimisation of capillary electrophoresis (CE) methods. Similar designs have been utilised in the assessment of the robustness of CE methods. The designs employed include central composites, fractional factorials, Plackett-Burman, simplex and overlapping-resolution mapping. Optimisation studies have largely concentrated on the use of these designs on selection of the optimal electrolyte composition. The robustness testing studies performed have involved the use of screening designs to identify the critical parameters affecting responses such as migration times and resolution. Further designs such as central composites have then been employed to set method limits following robustness studies. It is concluded that the use of experimental designs and statistical data evaluation in conjunction with personal computer-controlled CE autosamplers and instruments are of great benefit in the optimisation and robustness evaluation of CE methods.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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