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• W2010964214 endingPage "236" @default.
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• W2010964214 abstract "An alternative on-line automated sample enrichment technique useful for the direct determination of various drugs and their metabolites in plasma is described for rapid development of highly sensitive and selective liquid chromatographic methods using mass spectrometric detection. The method involves direct injection of plasma onto an internal surface reversed-phase (ISRP) guard column, washing the proteins from the column to waste with aqueous acetonitrile, and backflushing the analytes onto a reversed-phase octyl silica column using switching valves. The analytes were detected using a tandem mass spectrometer operated in selected reaction monitoring (SRM) mode using atmospheric pressure chemical ionization (APCI). Use of two ISRP guard columns in parallel configuration allowed alternate injections of plasma samples on these columns for sample enrichment and shortened the column equilibration and LC-MS-MS analysis times, thereby increasing the sample throughput. The total run time, including both sample enrichment and chromatography, was about 6 min. Using this technique, an analytical method was developed for the quantitation of granisetron and its active 7-hydroxy metabolite in dog plasma. Granisetron is a selective 5-HT3 receptor antagonist used in the prevention and treatment of cytostatic induced nausea and vomiting. Recovery of the analytes was quantitative and the method displayed excellent linearity over the concentration ranges tested. Results from a three day validation study for both compounds demonstrated excellent precision (1.3-8.7%) and accuracy (93-105%) across the calibration range of 0.1 to 50 ng/ml using an 80 microliters plasma sample. The automated method described here was simple, reliable and economical. This on-line approach using ISRP columns and column switching with LC-MS-MS is applicable for the quantification of other pharmaceuticals in pharmacokinetic studies in animals and humans which require high sensitivity." @default.
• W2010964214 created "2016-06-24" @default.
• W2010964214 creator A5025798438 @default.
• W2010964214 creator A5041604649 @default.
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• W2010964214 date "1996-04-01" @default.
• W2010964214 modified "2023-09-26" @default.
• W2010964214 title "Direct plasma liquid chromatographic-tandem mass spectrometric analysis of granisetron and its 7-hydroxy metabolite utilizing internal surface reversed-phase guard columns and automated column switching devices" @default.
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• W2010964214 doi "https://doi.org/10.1016/0378-4347(95)00480-7" @default.
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