title: Assay for trimethoprim in serum and urine by means of ion-pair chromatography.
abstract: We describe a rapid, precise, and reliable procedure for assay of trimethoprim in serum and urine by ion-pair chromatography. Trimethoprim concentrations in urine are determined by an externally standardized, direct-injection procedure; assay in serum involves a simple preliminary extraction and internal standardization. The assays are suitable for pharmacokinetic studies and have been applied to determination of trimethoprim concentrations in serum and urine during therapy with Co-trimoxazole, a sulfonamide/trimethoprim preparation.
mesh_terms: D002849:Chromatography, Gas / Q000379:methods; D006801:Humans; D006863:Hydrogen-Ion Concentration; D008832:Microchemistry; D014295:Trimethoprim / Q000097:blood* / Q000652:urine
chemical_list: D014295:Trimethoprim