The high-speed liquid chromatographic behavior of 15 tetracyclines on anionand cation-exchange columns is described and illustrated by typical separations of a number of tetracycline derivatives on several systems, as well as by the resolution of tetracycline from its degradation products epi-, epianhydro-, and anhydrotetracycline. These serve as a basis for a rapid, convenient, and precise method for the direct detection of the tetracycline antibiotics and their degradation products.Tetracycline has been analyzed by titrimetric

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