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  • 1
    Electronic Resource
    Electronic Resource
    Evaluation of phenyldimethylethoxysilane treated high-performance thin-layer chromatographic plates. Application to analysis of flavonoids inScutellariae radix (1993)
    Springer
    Chromatographia 35 (1993), S. 281-284 
    Details
    ISSN: 1612-1112
    Keywords: Thin-layer chromatography ; Monophenyl-treated thin layer plate ; Phenyldimethylethoxysilane treated plate ; Flavonoids inScutellariae radix ; Baicalin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The retention and selectivity of flavonoids (baicalin, baicalein, wogonin, oroxylin A) inScutellariae radix have been studies by high-performance thin-layer chromatography on phenyldimethylethoxysilane-treated silica plates. The silica plates treated with phenyl groups were used for physical and chemical analysis. From elemental carbon analysis, the maximum number of bonded phenyl surface groups per gram was calculated to be 0.467×1021 (Oginal silica plate: Merck Art. 15109, Silica gel 100 F254). With methanol-1/15 M phosphate buffer (pH 6.2) mixtures as mobile phase, baicalin, baicalein, wogonin, and oroxylin A inScutellariae radix were separated. It has been shown that phenyl-treated plates are more suitable for selective separation of baicalin, baicalein, wogonin, and oroxylin A than octadecyl-treated plates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02277510
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Determination of chenodeoxycholic acid on 3-cyanopropyltrichlorosilane-treated high-performance thin-layer chromatographic plates (1987)
    Springer
    Chromatographia 23 (1987), S. 601-603 
    Details
    ISSN: 1612-1112
    Keywords: High-performance, thin-layer chromatography (HPTLC) ; 3-Cyanopropyltrichlorosilane-treated plates ; Chenodeoxycholic acid
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Chenodeoxycholic acid in commerical drugs was analyzed by high-performance, thin-layer chromatography (HPTLC) using a cyanoalkyl chemically-bonded stationary phase, prepared by treating pre-coated silica with 3-cyanopropyltrichlorosilane (3CPTS). The 3CPTS-treated plates were used to evaluate commerical chenodeoxycholic acid in drug capsules. After development with methanol on the 3CPTS-treated plate, the chenodeoxycholic acid spot in the chromatogram was measured with a TLC densitometer equipped with a dual-wave length TLC scanner at λ=370nm. By this method, the fluorescence intensity of chenodeoxycholic acid was measured within 2.6% error over the range 30–240ng and the limit of detection was 30ng.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02324873
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Evaluation of thin layer chromatography—Fast atom bombardment mass spectrometry: Application to the determination of midazolam intoxication by use of 3-glycidoxypropyl-treated thin layer chromatographic plates (1993)
    Springer
    Chromatographia 36 (1993), S. 293-296 
    Details
    ISSN: 1612-1112
    Keywords: Thin layer chromatography ; Fast atom bombardment mass spectrometry ; TLC/FABMS ; 3-Glycidoxypropyldimethylethoxysilane treated TLC plate ; Midazolam intoxication
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The effectiveness of 3-glycidoxypropyl-treated thin layer chromatographic plates in the determination of midazolam intoxication has been studied by thin layer chromatography/fast atom bombardment mass spectrometry. Silica plates treated with 3-glycidoxypropyldimethylethoxysilane were used for the measurement of their physical composition and for chemical analysis. From elemental carbon analysis data, the maximum number of bonded 3-glycidoxypropyl surface groups per gram was calculated to be 0.417×1021. Midazolam in human serum from patients suffering from intoxication could be separated on a 3-glycidoxypropyl-treated thin layer chromatographic plate with chloroform as eluent. After applying the technique of diffused spot condensation on the 3-glycidoxypropyl-treated thin layer chromatographic plate, the established thin layer chromatography/fast atom bombardment mass spectrometry method was used for the identification of midazolam intoxication, and improved the detection limit for midazolam in the serum of an intoxication patient by 30 times.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02263880
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    Paper (German National Licenses)
    Fulltext
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