Acta Pol Pharm
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Propanidid and etomidate were extracted from blood with diethyl ether at pH ca. 8 (phosphate buffer), then separated and identified by thin-layer chromatography on silica gel, using diethyl ether-acetone (3:1, v/v) for propanidid or dioxane-acetic acid (47:3, v/v) for etomidate as the mobile phase. Both compounds can be revealed on dried chromatograms using sodium carbonate solution up to the amount 1 microg/cm3 of plasma, and it is sufficient sensivity for propanidid adhibited in therapeutic doses, whereas this limits the detection of etomidate for overdosed patients only.
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High-performance reversed-phase liquid chromatographic determination of propanidid and etomidate was performed on ODS silica, after precipitation of the proteins in plasma with methanol, extraction of the drugs with diethyl ether, evaporation and dissolving in a mobile phase: acetonitrile-phosphate buffer pH 4.44 (7:3, v/v); UV detection at 254 nm. Dionine hydrochloride was used as an internal standard. Propanidid was determined in a range 5-25 microg/cm3 of plasma and etomidate in 0.1-0.5 microg/cm3 of plasma, thus enables the analysis of therapeutic levels of the drugs.