High-performance liquid chromatography assay of bleomycin in human plasma and rat hepatocytes in culture

A sensitive and rapid linear-gradient, ion-paired, reversed-phase high-performance liquid chromatography technique using fluorescence detection was developed to quantify bleomycin (BLM) metabolites in the plasma of patients undergoing BLM therapy and in rat hepatocytes that had previously been incubated with 5 x 10(-5) M BLM. We could detect about 70 ng/ml using this procedure. BLM metabolites were assayed in the supernatant fractions of precipitated human plasma and in pellets of rat hepatocytes. Metabolite concentrations were below the level of detection in human plasma samples. In hepatocyte pellets, metabolites such as deamido-BLM A2 and deamido-BLM B2 were detected, indicating that isolated rat hepatocytes in culture can metabolize BLM analogues to the corresponding deamido-BLMs. The high-performance liquid chromatography procedure developed during this work can be used to study the metabolism of BLM in cell culture systems.

Determination of adriamycin and its fluorescent metabolites in human plasma by HPLC

We describe a method for measuring adriamycin and its metabolites, adriamycinol and adriamycinone in plasma, using reversed phase HPLC and fluorescence detection. The lower limit of detection is approximately 1 ng/mL for each compound. An extraction technique for serum is described which is capable of an almost equal recovery (greater than 93%) of adriamycin and metabolites without interference from endogenous components of plasma and from other common drugs. Within-day and day to day coefficients of variation are estimated.

Quantitative determination of adriamycin in rat hepatocytes using a volatile extraction buffer, HPLC and fluorescence detection

A rapid and sensitive isocratic technique is described for the determination of concentrations of adriamycin and two of its metabolites, adriamycinol and adriamycinone, in freshly isolated rat hepatocytes. The drugs are easily and efficiently extracted from the cells with an organic mixture (chloroform-n-butanol) after proteolytic digestion with trypsin. Mean recoveries from spiked culture medium cell suspension are greater than 96%. The within run and day-to-day coefficients of variation are less than 7.5%.