Abstract
A sensitive and specific method is described for the quantitative analysis of 6,11-dihydro-11-oxo-dibenz[b,e]oxepin-3-acetic acid (oxepinac) in human plasma, urine and saliva. Oxepinac and internal standard are extracted from acidified plasma, urine or saliva, converted to the corresponding n-propyl esters and analysed by gas chromatography--mass fragmentography using selected ion monitoring. The method is accurate and precise over the range 100 microgram/ml to 1.0 ng/ml. The method has been applied to the analysis of plasma, urine and saliva from healthy volunteers receiving therapeutic doses of oxepinac.
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