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McDermott, B.J. et al.

Gas chromatographic analysis of triethylenethiophosphoramide and triethylenephosphoramide in biological specimens.

Comprehensive pharmacokinetic studies could realise a greater potential for the antitumour agent triethylenethiophosphoramide (ThioTEPA), and these would be aided by the development of a selective and sensitive assay. After extraction of ThioTEPA and its metabolite, triethylenephosphoramide (TEPA), from plasma using Sep-Pak C18 cartridges, the compounds were separated by capillary chromatography, detected using a nitrogen detector and quantified by reference to an internal standard, hexaethylphosphoramide. The limits of sensitivity were 1-5 ng/ml. Analytical recoveries were 74 and 95%, for TEPA and ThioTEPA, respectively, in the therapeutic range. At similar concentrations, extents of protein binding, determined by ultrafiltration, were not significant. Preliminary investigations of the elimination of ThioTEPA show that drug loss occurs more quickly in mice than in humans and in both species the metabolite is extensively recycled.[1]

References

Gas chromatographic analysis of triethylenethiophosphoramide and triethylenephosphoramide in biological specimens. McDermott, B.J., Double, J.A., Bibby, M.C., Wilman, D.E., Loadman, P.M., Turner, R.L. J. Chromatogr. (1985) [Pubmed]

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