The three metabolites of dipyrone found in plasma (4-methylaminoantipyrine, 4-aminoantipyrine and 4-fonnylaminoantipyrine) were separated and quantified by micellar liquid chromatography. The method used an 0.1 M sodium dodecyl sulphate mobile phase and an octadecyl silica bonded stationary phase. Dipyrone metabolites were measured by UV detection at 262 nm. The proposed method needs only 5 min to separate the three metabolites at a flow rate of 1 ml/min. The limits of detection (LODs) in plasma ranged between 0.1 and 0.2 ng injected. The method was applied to the determination of dipyrone metabolites in human plasma samples.
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