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Gas-chromatographic analysis of busulfan for therapeutic drug monitoring

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Abstract

The development and validation of a gas chromatographic assay method for determination of total and free busulfan concentrations in human plasma for pharmacokinetic studies is reported. 1,6-Bis(methanesulfonyloxy)hexane, the internal standard, and a potential metabolite, 3-hydroxysulfolane, were synthesized. Plasma and plasma ultrafiltrate samples containing busulfan and internal standard were extracted with ethyl acetate and derivatized with 2,3,5,6-tetrafluorothiophenol prior to gas chromatographic determination. The63Ni electron-capture detector provided a limit of detection of 0.0600 μg/ml with a limit of quantitation of 0.100 μg/ml busulfan in biological samples. Calibration curves were linear from 0.100 to 3.00 μg/ml in plasma (500 μl) and 0.100 to 2.00 μg/ml in plasma ultrafiltrate (100 μl). Extraction and derivatization yields ranged from 78.4% to 89.6% and 56.0% to 71.3%, respectively. Specificity of this assay for busulfan in the presence of its potential metabolites was demonstrated. Also, plasma samples containing co-administered drugs gave no response under these conditions. Clinical samples obtained following administration of a 1 mg/kg oral busulfan dose demonstrate the applicability of this method to analysis of total and free plasma concentrations.

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This work was supported in part by Burroughs Wellcome Inc. and the British Columbia Cancer Agency.

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Embree, L., Burns, R.B., Heggie, J.R. et al. Gas-chromatographic analysis of busulfan for therapeutic drug monitoring. Cancer Chemother. Pharmacol. 32, 137–142 (1993). https://doi.org/10.1007/BF00685617

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