Renal clearance of sulphinpyrazone in man

N2-glucuronidation and N4-acetylation of sulphaphenazole by the turtle Pseudemys scripta elegans

After an oral dose of 100 mg of sulphaphenazole, the turtle Pseudemys scripta elegans excretes 27% of the compound unchanged and 3.8% as N4-acetylsulphaphenazole. The expected glucuronide conjugate, sulphaphenazole-N2-glucuronide, is not formed and excreted.

High pressure liquid chromatographic analysis and preliminary pharmacokinetics of sulfaphenazole and its N2-glucuronide and N4-acetyl metabolites in plasma and urine of man

A direct high pressure liquid chromatographic analysis of sulfaphenazole-N2-glucuronide in urine is described. After an oral dose of 439 mg of sulfaphenazole, 0% is excreted unchanged in the urine, less than 1% is excreted as N4-acetylsulfaphenazole. As N2-glucuronide 49.4% is excreted in one slow acetylator and 84.8% in one fast acetylator.