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• W1978761462 abstract "A simple, inexpensive and disposable device for liquid-phase microextraction (LPME) is presented for use in combination with capillary gas chromatography (GC), capillary electrophoresis (CE) and high-performance liquid chromatography (HPLC). 1–4 ml samples of human urine or plasma were filled into conventional 4-ml vials, whereafter 15–25 μl of the extraction medium (acceptor solution) was filled into a short piece of a porous hollow fiber and placed into the sample vial. The drugs of interest were extracted from the sample solutions and into the small volumes of acceptor solution based on high partition coefficients and were preconcentrated by a factor of 30–125. For LPME in combination with GC, the porous hollow fiber was filled with 15 μl n-octanol as the acceptor solution. Following 30 min of extraction, the organic acceptor solution was injected directly into the GC system. For LPME in combination with CE and HPLC, n-octanol was immobilized within the pores of the hollow fiber, while the internal volume of the fiber was filled with either 25 μl of 0.1 M HCl (for extraction of basic compounds) or 25 μl 0.02 M NaOH (for acidic compounds). Following 45 min extraction, the aqueous acceptor solution was injected directly into the CE or HPLC system. Owing to the low cost, the extraction devices were disposed after a single extraction which eliminated the possibility of carry over effects. In addition, because no expensive instrumentation was required for LPME, 10–30 samples were extracted in parallel to provide a high number of samples per unit time capacity." @default.
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• W1978761462 date "2000-03-01" @default.
• W1978761462 modified "2023-10-14" @default.
• W1978761462 title "Development of a simple in-vial liquid-phase microextraction device for drug analysis compatible with capillary gas chromatography, capillary electrophoresis and high-performance liquid chromatography" @default.
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• W1978761462 doi "https://doi.org/10.1016/s0021-9673(99)01163-2" @default.
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