title: Analysis of tetracycline in pharmaceutical preparations by improved high-performance liquid chromatographic method.
abstract: The analysis of tetracycline in pharmaceutical preparations by an improved high-performance liquid chromatographic (HPLC) method is described. The improved method uses a 30-cm long stainless steel column packed with octadecylsilane bonded on 10-mum silica gel, with a linear gradient from 10 to 60% acetonitrile in pH 2.5, 0.02 M phosphate buffer in 11 min at a flow rate of 1.0 ml/min (68 atm). The resolution functions obtained between 4-epitetracycline and tetracycline and between 4-epianhydrotetracycline and anhydrotetracycline were improved 150 and 250%, respectively. The analysis of a tetracycline sample takes approximately 16 min; the original method required more tan 25 min. The relative standard deviation for the analysis of tetracycline powder was 0.66%, and the recovery of 4-epianhydrotetracycline added in tetracycline was linear over the 0.3-100% range. Recovery of tetracycline from products was better than 99.6% at label concentration. The drug content of products as calculated from the HPLC data agreed well with those of the microbiological assay methods.
mesh_terms: D001681:Biological Assay; D002214:Capsules / Q000032:analysis; D002851:Chromatography, High Pressure Liquid; D008722:Methods; D009675:Novobiocin / Q000032:analysis; D009761:Nystatin / Q000032:analysis; D011208:Powders / Q000032:analysis; D013535:Suspensions / Q000032:analysis; D013608:Tablets, Enteric-Coated / Q000032:analysis; D013752:Tetracycline / Q000032:analysis*; D013754:Tetracyclines / Q000302:isolation & purification
chemical_list: D002214:Capsules; D011208:Powders; D013535:Suspensions; D013608:Tablets, Enteric-Coated; D013754:Tetracyclines; D009761:Nystatin; D009675:Novobiocin; D013752:Tetracycline