Determination of phenylbutazone, tolbutamide and metabolites in plasma and urine using chemical ionization mass spectrometry.


Quantitative analytical procedures for the analysis of phenylbutazone and tolbutamide levels in plasma have been developed which involve the addition of deuterium labeled internal standards to plasma followed by extraction and direct sample insertion into a mass spectrometer operating under chemical ionization conditions. Peak height ratios used to… (More)


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