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A liquid chromatographic (LC) method for determination of etoposide in dog blood is described. The technique includes solvent extraction of etoposide using a dichloroethane-hexane mixture and reconstitution of the drug in an aqueous reconstitution solution. The samples are analyzed by reversed-phase LC with electrochemical detection. Validation of the method demonstrated good sensitivity, precision and reproducibility. The method is useful for the study of etoposide pharmacokinetics in the dog.

A novel water-soluble polymer, poly[(chloromethoxytrialanine methyl ester)phosphazene] (poly-Tame), was characterized and evaluated using high-performance size-exclusion chromatography, gradient reversed-phase high-performance liquid chromatography and ion chromatography. These novel liquid chromatographic methods were validated for application to in vitro biodegradation experiments of poly-Tame in aqueous solutions. Results from method validation experiments are presented.