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  • 1
    Digitale Medien
    Digitale Medien
    Supercritical fluid extraction combined with solid phase extraction as sample preparation technique for the analysis of β-blockers in serum and urine (1998)
    Springer
    Fresenius' journal of analytical chemistry 360 (1998), S. 618-621 
    Details
    ISSN: 1432-1130
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract A method is developed for the determination of β-blockers in serum and urine at levels of 0.5 μg/mL. The technique uses a combination of solid phase extraction (SPE) with in situ derivatization and supercritical fluid extraction (SFE) with subsequent gas chromatography mass spectrometry. The optimization of the SFE step shows that a static extraction period can be eliminated. The method gives good linearity (r = 0.991–0.999) and repeatability in the concentration range of 0.5 to 5 μg/mL. Relative standard deviations for oxprenolol, propanolol and metoprolol were less than 5% in serum and 5–11% in urine.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s002160050769
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Volatile oil analysis of Thymus vulgaris L. by directly coupled SFE/GC (1992)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Microcolumn Separations 4 (1992), S. 3-7 
    Details
    ISSN: 1040-7685
    Schlagwort(e): capillary gas chromatography ; supercritical fluid extraction ; on-line SFE/GC ; dynamic SFE ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Dynamic supercritical fluid extraction (SFE) with CO2 as the supercritical fluid was coupled to capillary gas chromatography (GC). A cryotrap/thermal desorption unit external to the GC was used to collect the extracted compounds and introduce them into the GC column. The reproducibility of the SFE/GC system was tested through replicate analyses of thyme, and the recoveries of thyme components were compared with those obtained from hydrodistilled oil of thyme by GC. Excellent agreement was achieved, but the results showed that chromatographic valves and valve materials may be critical in obtaining good results.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/mcs.1220040102
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Analysis of chemical warfare agents in soil samples by off-line supercritical fluid extraction and capillary gas chromatography (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Microcolumn Separations 3 (1991), S. 505-512 
    Details
    ISSN: 1040-7685
    Schlagwort(e): supercritical fluid extraction ; off-line extraction ; capillary gas chromatography ; chemical warfare agents ; soil samples ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Nerve agents and two other chemical warfare agents were extracted from spiked soil with supercritical CO2. Supercritical fluid extraction (SFE) was used as an off-line technique. The extracts were analyzed with a two-channel capillary gas chromatograph, equipped with an autosampler and flame ionization and nitrogen-phosphorus detectors. Compounds were identified and quantified automatically with the help of retention index monitoring (RIM). Recoveries were equal to or better than those obtained with solvent extraction by sonication.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/mcs.1220030605
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