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  • Column liquid chromatography  (3)
  • 04. Solid Earth::04.04. Geology::04.04.07. Rock geochemistry
  • Chemistry
  • Springer  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Simultaneous determination of triprolidine, pseudoephedrine, paracetamol and dextromethorphan by HPLC (1996)
    Springer
    Chromatographia 43 (1996), S. 496-500 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Pharmaceutical formulations ; Triprolidine ; Pseudoephedrine ; Paracetamol ; Dextromethorphan
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A simple, rapid and specific HPLC method has been developed for the determination of triprolidine, pseudoephedrine, paracetamol and dextromethorphan, in combination, in different pharmaceutical dosage forms, using a reversed-phase C18 column, gradient elution, and UV detection at 254 and 280 nm. No preliminary extraction procedure is required for liquid formulations and a very simple extraction procedure is required for tablets and creams. The recovery of the drugs ranged from 96.0 to 98.7%. The assay results obtained for eight commercially available formulations were in agreement with the amounts declared. The linearity and precision of the method have been assessed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02293000
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  • 2
    Electronic Resource
    Electronic Resource
    HPLC analysis of boldine in pharmaceuticals (1997)
    Springer
    Chromatographia 44 (1997), S. 619-622 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Boldine in pharmaceuticals
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A method is proposed for extraction, separation, identification and quantitative measurement of boldine (I) in pharmaceuticals. The extraction of (I) from the matrix (syrups, tablets, extracts) was realized with aqueous ammonium chloride (0.02 M, pH=3.0 with perchloric acid) and the clean-up of the extract was performed by solid-phase extraction by means of cartridges containing a strong cation-exchange sorbent, from which (I) was eluted with aqueous ammonium chloride (1 M, pH=10.0 with ammonia). The final eluate was examined by HPLC. Chromatography was performed on a C-8 column with a gradient elution from 15:85 to 30:70 of acetonitrile-water containing 0.1 M sodium perchlorate (pH=3.0), in 20 min. A diode array detector was used at 302 nm for detection. The method gives recovery values greater than 98% and the reproducibility is within 6.0%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02466665
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  • 3
    Electronic Resource
    Electronic Resource
    HPLC determination of rhodamine B (C.I. 45170) in cosmetic products (1996)
    Springer
    Chromatographia 43 (1996), S. 76-78 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Rhodamine B in cosmetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A method is proposed for the extraction, separation, identification and quantitative measurement of rhodamine B in cosmetics samples The colour is extracted with a solution of orthophosphoric acid in either water or DMF (depending on the type of cosmetic) adsorbed on a polyamide column, and then eluted with water and methanol. Further clean-up of the extract is performed by means of a Bond Elut C-18 cartridge, from which rhodamine B is eluted with methanol-water (8∶2). The final eluate is examined by HPLC. Chromatography is performed on a C-18 column with a gradient elution from 50∶50 to 70∶30 of acetonitrile-water, containing 0.1 M sodium perchlorate, in 15 min. A diodearray detector enables peak purity analysis. The method gives recovery values of approximately 90%, or better, and the reproducibility is within 4%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02272825
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