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A liquid chromatographic method is described that can be used for the determination of suramin in plasma samples from cancer patients treated with this drug. The chromatographic system is based on the use of tetrabutylammonium bromide as an ion-pairing agent, while ultraviolet detection is applied. The sample pretreatment is a simple deproteination step by an organic solvent. The same counter-ion as used in the phase system is added in order to increase the recovery of the almost complete protein-bound suramin. The minimum detectable concentration in plasma is ca. 0.1 microgram/ml, thus allowing the monitoring of patients treated with this drug. One example of a plasma concentration-time course after administration of suramin is given.
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