in order to examine the suitability of our four established methods for the analysis of tetracyclines ( high-performance liquid chromatography , reversed-phase thin-layer chromatographic densitometry , reversed-phase thin-layer chromatographic spray reagents and silica gel high-performance thin-layer chromatographic densitometry ) for the determination of impurities in tetracycline pharmaceutical preparations , sixteen samples available on the japanese market were analysed .
C0039651
tetracyclines
C0039644
tetracycline