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- W2078330068 abstract "An isocratic high performance liquid chromatographic method is described for the determination of the β-adrenergic blocking drug, propranolol, and the diuretic, furosemide, in human plasma. The two compounds and the internal standard were extracted from plasma using a two-step extraction technique. Propranolol and pindolol (internal standard) were first extracted from alkaline plasma into diethyl ether; this was followed by extraction of furosemide into acidified ether: hexane (65:35). The two extracts were then combined and evaporated under nitrogen, and the reconstituted residues were analysed on a C18/SCX reversed-phase/cation exchange column with a mobile phase of acetonitrile: 0.1 M sodium acetate pH 4 (33:67). The drugs and the internal standard were detected by UV absorption at 230 nm. The drugs were also extracted from plasma by a column-switching technique utilizing a ten-port valve. The drug compounds were retained on a C18 pre-column. A comparison of RSD for within-batch (intra-assay) and between-batch (inter-assay) runs for both methods was carried out, the liquid/liquid extraction method giving better recovery values. The calibration graphs were linear from 25–300 ng ml−1 for furosemide and 50–400 ng ml−1 for propranolol. Recovery values were > 90.0% by liquid/liquid extraction and > 76.0% by column switching." @default.
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- W2078330068 date "1996-02-01" @default.
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- W2078330068 title "Comparison of two extraction methods for determination of propranolol and furosemide in human plasma by mixed-mode chromatography" @default.
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- W2078330068 doi "https://doi.org/10.1016/0731-7085(95)01652-x" @default.
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