Quantitation of doxapram in blood,plasma and urine |
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Authors: | Helen Nichol John Vine Jack Thomas RGeorge Moore |
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Institution: | Department of Pharmacy, University of Sydney, N.S.W. Australia;Foetal Pharmacology Laboratory, Foundation 41, Women''s Hospital, Crown Street, Sydney, N.S.W. Australia |
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Abstract: | Methods for the quantitation of doxapram in blood, plasma and urine have been developed. Following extraction, gas—liquid chromatography was used to separate doxapram from basic metabolites. Doxapram was detected by mass spectrometry for blood and plasma assays, and by flame ionisation for urine assays. The limit of reliable quantitation in blood and plasma was 10 ng and in urine 500 ng, the coefficients of variation being 6.37%, 1.72% and 2.31% respectively. To illustrate the clinical applicability of the assay methods, plasma, blood and urine levels were monitored in a premature newborn following an intravenous infusion of doxapram. |
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Keywords: | To whom correspondence should be addressed |
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