Abstract
Cyclophosphamide (CP) has been in clinical use for the treatment of malignant disease for over 40 years. CP is inactive until it undergoes complex metabolic pathways leading to the ultimate alkylating agent, phosphoramide mustard, but also to inactive and toxic metabolites. Sensitive and specific methods are now available for the measurement of CP and its enantiomers, its metabolites and their stereoisomers, in biological matrices. An overview is given of the methods of analysis of CP and its metabolites described in literature since 1993 as well as the current knowledge about its metabolism. Five classes of methods are described: (1) thin-layer chromatography-photographic densitometry, (2) high performance liquid chromatography, (3) gas chromatography and gas chromatography coupled to mass spectrometry, (4) phosphorus-31 nuclear magnetic resonance and (5) enantiomeric separation. In each case, sample clean up and preparation are described. Precision and limits of quantification of the assays are indicated. A table summarizes all the analytical methods for assaying each metabolite.
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