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  • 1
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Chlortetracycline and related substances ; Poly(styrene-divinylbenzene)copolymer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary An isocratic high performance liquid chromatographic method has been developed for assay and purity control of chlortetracycline, which is separated from all related compounds. The stationary phase is poly(styrene-divinylbenzene)copolymer (PSDVB), which is heated at 60°C. The mobile phase is 2-methyl-2-propanol-1.0 M perchloric acid (5.0 ml)-water (up to 100 ml). The amount of alcohol modifier varies between 2.5 and 6.5% m/v depending upon the brand and porosity of PSDVB used. The flow rate is 1.0 ml/min and UV detection is at 254 nm. The total analysis time does not exceed 40 min. Although the method has been shown to be applicable with several brands of 100 Å PSDVB e.g. PLRP-S, PRP-1, RoGeL and TSK-Gel, the best separations were obtained on the wide pore material PLRP-S 100 Å.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Official methods of analysis ; Method evaluation ; Minocycline
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The liquid chromatographic methods laid out for the analysis of minocycline hydrochloride in the British Pharmacopoeia 1988, the United States Pharmacopeia XXII and the Pharmacopée Française 10 were examined. The major difference between these methods lies in the adjustment of the pH of the mobile phase. The analyst has to obtain the right pH of the mobile phase for his available column. This was found to be a less than easy task for the occasional analyst. Other disadvantages observed were poor solubility of the components of the mobile phase, reduced sensitivity due to UV absorbance by the mobile phase, rather high back pressure, the elution order for 9-minocycline depending on the brand of stationary phase, and above all, poor stability of the stationary phase.
    Type of Medium: Electronic Resource
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