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  • 1
    Electronic Resource
    Electronic Resource
    A strategy for two-dimensional, high-performance thin-layer chromatography, applied to local anesthetics (1987)
    Springer
    Chromatographia 23 (1987), S. 407-411 
    Details
    ISSN: 1612-1112
    Keywords: High-performance TLC ; Two-dimensional identification ; Correlation criterion ; Local anesthetics ; Quantisation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A straightforward and simple strategy for the selection of the two systems in two-dimensional, high-performance thin-layer chromatography (HPTLC) is presented. The choice is based on the absolute values of the correlation matrix elements. The response function, expressed as a percentage, is also based on the correlation coefficient. The applicability and usefulness of this approach is demonstrated by the separation of fourteen local anesthetics. After identification, one-dimensional HPTLC can be used for quantisation by reflectance scanning by UV at the optimum wavelength.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02311815
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Evaluation of densitometric quantitation of ether phospholipids by high performance thin layer chromatography (1990)
    Springer
    Chromatographia 30 (1990), S. 414-420 
    Details
    ISSN: 1612-1112
    Keywords: Thin-layer chromatography ; Ether phospholipids ; Densitometry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary This paper reports on the use of uni-dimensional high performance thin layer chromatography on silica gel for the separation and detection of ether phospholipids involving in situ reflectance densitometry. Dipping reagents for charring (cupric sulfate-phosphoric acid and manganese chloride-sulfuric acid) or fluorescence enhancement (1-anilino-8-naphthalene sulfonate) were evaluated. Two lipophilic fluorescence reagents (2,5-bis-5′-tert-butylbenzoxazolyl-(2′))thiophene and 4-(N,N-dihexadecyl)amino-7-nitrobenz-2-oxa-1,3-diazole) which move in the mobile phase were tested. The latter reagent gave the more sensitive and stable measurements: nanogram amounts of ether phospholipids could be detected in a reproducible way. Since alkyl lysophospholipids are highly polar molecules, high performance thin layer chromatography is a challenge. Characteristics of sorbents and influence of mobile phases on detection and separation are discussed for the NBD-dihexadecylamine fluorescence detection method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02328508
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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