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• W2077752617 abstract "The use of a programmed temperature vaporiser (PTV) with a packed liner was evaluated for the injection of large volumes (up to 100 μl) of plasma extracts in a gas chromatograph. Solvent purity, which is essential when large volumes are injected into the GC system, was determined. Special attention was paid to the purity of the solvents used for the solid-phase extraction (SPE) procedure. For this SPE method, ethyl acetate was used as the extraction and reconstitution solvent, and thus the purity of the ethyl acetate was critical, especially when a non-selective GC detector was applied. The liquid capacity and inertness of different packed liners were investigated. The liner packed with ATAS “A” (modified Chromosorb-based material with special treatment) was found to be the most suitable for the analysis of the tested drugs. Good linearity in response for variations in volume and concentration was observed. A comparison was made between the applicability of flame ionisation detection (FID) and mass-selective detection (MSD). When 50-μl volumes of plasma extracts were injected with the PTV, the detection limits for secobarbital, lidocaine, phenobarbital and diazepam were about 50-times lower than when 1-μl volumes were injected. The detection limits of the tested compounds in plasma for injection of 50–100 μl plasma extract are 5–10 ng/ml for GC–FID whereas plasma concentrations of 250 pg/ml can be detected using the selected ion monitoring (SIM) mode of a MSD. For non-selective GC–FID, the background from a 50-μl injection was substantially larger than with 1-μl injection as a result of co-injected plasma matrix components and solvent impurities. These background effects were less with GC–MSD in the total ion current mode and virtually absent with GC–MSD in the SIM mode." @default.
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• W2077752617 date "1999-06-01" @default.
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• W2077752617 title "Evaluation of the programmed temperature vaporiser for large-volume injection of biological samples in gas chromatography" @default.
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• W2077752617 doi "https://doi.org/10.1016/s0378-4347(99)00159-0" @default.
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