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quinidine/hymenoxys rusbyi
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Determination of quinidine and metabolites in urine by reverse-phase high-pressure liquid chromatography.
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A new reverse-phase high-pressure liquid chromatography assay allowing simultaneous but separate quantitation of urinary levels of quinidine and its major metabolites, 2'-quinidinone, 3-OH-quinidine and a newly detected N-oxide, is described. The compounds were separated on a alkyl phenyl column
Simultaneous liquid-chromatographic determination of three antiarrhythmic drugs: disopyramide, lidocaine, and quinidine.
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We report a common methodology for determining three antiarrhythmic drugs: disopyramide, lidocaine, and quinidine. Alkalinized serum and internal standard (p-chlorodisopyramide) are extracted into dichloromethane, the organic phase is evaporated, and the redissolved residue is injected onto a
High-performance liquid chromatographic method for the quantitation of quinidine and selected quinidine metabolites.
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A specific and sensitive assay for the separation and quantitation of quinidine, 3-hydroxyquinidine, quinidine-N-oxide, O-desmethylquinidine and dihydroquinidine is presented. The assay is shown to be sensitive to concentrations of 0.1 microgram/ml for all the above compounds when using a serum
Partial synthesis of 6'-hydroxycinchonine and its antiarrhythmic activity in mice.
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The synthesis of 6'-hydroxycinchonine [8R,9S)-cinchonan-6',9-diol] was achieved by demethylating quinidine with boron tribromide in dichloromethane at -75 degrees C. The antiarrhythmic activities of 6'-hydroxycinchonine and quinidine were compared following the infusion of aconitine into the tail
Determination of quinine in serum, plasma, red blood cells and whole blood in healthy and Plasmodium falciparum malaria cases by high-performance liquid chromatography.
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A normal-phase high-performance liquid chromatographic method using dichloromethane-methanol-1 M perchloric acid (100:9:0.4, v/v) at a flow-rate of 0.8 ml/min on a Zorbax-Sil column with fluorescence detection has been developed for the separation of quinine and quinidine from other antimalarials.
Simultaneous liquid-chromatographic determination of five antiarrhythmic drugs and their major active metabolites in serum.
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We report an isocratic "high-performance" liquid chromatographic method for the simultaneous measurement of tocainide, lidocaine, procainamide, quinidine, disopyramide, and their major active metabolites in serum. The drugs are extracted from 200 microL of serum at pH 9.5 with 1.5 mL of
Salt and cosolvent effects on ionic drug loading into microspheres using an O/W method.
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Salt effects on aqueous solubility and microsphere entrapment efficiency of a model ionic drug (quinidine sulfate) were studied. Poly-D,L-lactic acid (PLA) microspheres were prepared using an O/W solvent evaporation method with various electrolytes added in different concentrations to the aqueous
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