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  • 1
    Digitale Medien
    Digitale Medien
    Use of non-segmented flow, post-columns reaction detection with miniaturized HPLC systems (1983)
    Springer
    Chromatographia 17 (1983), S. 125-131 
    Details
    ISSN: 1612-1112
    Schlagwort(e): Miniaturized HPLC ; Post-column reaction detection ; Catecholamines ; Packed-bed reactors ; Non-segmented open-tubular reactors
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary The use of non-segmented flow, post-column reaction detection is evaluated for use with miniaturized HPLC. Non-segmented open-tubular reactors with internal diameters 0.1 mm to 0.25 mm and packed-bed reactors with internal diameters of 1 mm, filled with 5 and 10 μm particles are evaluated theoretically and experimentally with respect to band broadening and pressure drop characteristics. An integrated system consisting of miniaturized HPLC (1 mm i. d.) columns and compatible hardware is described. An example of the separation of catecholamines is given.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02271034
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  • 2
    Digitale Medien
    Digitale Medien
    Design and application of a post-column extraction system compatible with miniaturized liquid chromatography (1984)
    Springer
    Chromatographia 18 (1984), S. 5-10 
    Details
    ISSN: 1612-1112
    Schlagwort(e): Miniaturized HPLC ; Post-Column Extraction Detection ; Segmented-Flow Open-Tubular Reactors ; Membrane Phase Separator ; Anti-Cancer Drugs
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract An on-line, post-column, extraction system suitable for use with miniaturized HPLC (0.7–1 mm i.d. columns) is described. The system consists of a 30° angle segmenting tee, a PTFE extraction coil of variable length and a membrane phase separator. The internal volume of the phase separator is less than 1 μl. The total variance contribution of the system is between 1 and 6 sec2. The determination of the anti-cancer drugs VP 16 and VM 26 in urine by means of reversed-phase HPLC and fluorescence detection, using both on-column preconcentration and the present miniaturized post-column extraction system is presented as an application.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02279454
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Optimization of a peroxyoxalate chemiluminescence detection system for the liquid chromatographic determination of fluorescent compounds (1984)
    Springer
    Chromatographia 18 (1984), S. 129-133 
    Details
    ISSN: 1612-1112
    Schlagwort(e): Chemical excitation source ; Chemiluminescence detector ; Chemical band narrowing ; Dansyl derivative ; Serum
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary A peroxyoxalate chemiluminescence detection system for liquid chromatography is described. The excitation of fluorophores is generated by the reaction of bis-(2,4,6-trichlorophenyl)oxalate or bis(2,4-dinitrophenyl)oxalate and hydrogen peroxide, which are added to the column effluent. The influence of the solvents and the concentrations of the reagents have been investigated. The influence of the flow cell volume on sensitivity and on band broadening have also been studied and a “chemical band narrowing effect” has been observed. Different types of apparatus have been compared for detection of the emitted light. The system has been used for the detection of the dansyl derivative of a drug with a secondary amine functional group in serum samples. The detection limits are in the 1–10pg range.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02258768
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