Determination of paraquat in human blood plasma using reversed-phase ion-pair high-performance liquid chromatography with direct sample injection
2003; Elsevier BV; Volume: 59; Issue: 5 Linguagem: Inglês
10.1016/s0039-9140(02)00645-8
ISSN1873-3573
AutoresMaurizia Rossana Brunetto, A MORALES, Máximo Gallignani, J.L. Burguera, M. Burguera,
Tópico(s)Heme Oxygenase-1 and Carbon Monoxide
ResumoThis report describes the determination of paraquat (PQ) in human blood plasma samples by a direct-injection reversed-phase ion-pair chromatographic method. Blood plasma filtrate was injected directly into the LiChrospher(R) RP-18 alkyl-diol silica (ADS) precolumn integrated in a column switching system using a mixture of 3% 2-propanol and 10 mM sodium octane sulfonate (SOS) in a 0.05 M phosphate buffer (pH 2.8). After washing with this phase, the ADS precolumn was back-flushed with the analytical mobile phase consisting of 40% of methanol and 10 mM SOS in a 0.05 M phosphate buffer (pH 2.8) at a flow rate of 1.0 ml min(-1), in order to carry the analyte to a conventional reversed-phase analytical column, where the separation of PQ was achieved and finally detected by UV at 258 nm. The recoveries of PQ from human blood plasma samples ranged between 95.0 and 99.5% at nine different concentrations (from 0.05 to 3.00 microg of PQ ml(-1)) with coefficients of variation 3) was 0.005 microg ml(-1) with an injection volume of 200 microl. The proposed method is promising for the identification and quantification of PQ at low concentration levels and is suitable for its analysis in human blood plasma samples from intentional or accidental poisonings cases with a sample throughput of 5 samples per hour.
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