title: Extractionless high-performance liquid chromatographic method for the simultaneous determination of piroxicam and 5'-hydroxypiroxicam in human plasma and urine.
abstract: A simple and rapid (extractionless) high-performance liquid chromatographic method with UV detection, at 330 nm, was developed for the simultaneous determination of piroxicam and its major metabolite, 5'-hydroxypiroxicam, in human plasma and urine. Acidified plasma and alkali-treated urine samples are used and naproxen is added as internal standard. The separation is performed at 40 degrees C on a C18 Spherisorb column with acetonitrile--0.1 M sodium acetate (33:67, v/v, pH 3.3) as mobile phase. The retention time is 2.2 min for 5'-hydroxypiroxicam, 2.6 min for piroxicam and 3.2 min for naproxen. The detection limit is 0.05 micrograms/ml using a 100-microliters loop.
authors.affiliation: Military Pharmaceutical Laboratories, Athens, Greece.
authors.forename: A
authors.initials: A
authors.lastname: Avgerinos
authors.forename: S
authors.initials: S
authors.lastname: Axarlis
authors.forename: J
authors.initials: J
authors.lastname: Dragatsis
authors.forename: T
authors.initials: T
authors.lastname: Karidas
authors.forename: S
authors.initials: S
authors.lastname: Malamataris
mesh_terms: D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000032:analysis* / Q000097:blood / Q000652:urine; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D006801:Humans; D009288:Naproxen / Q000032:analysis; D010894:Piroxicam / Q000031:analogs & derivatives* / Q000032:analysis* / Q000097:blood / Q000493:pharmacokinetics / Q000652:urine; D015203:Reproducibility of Results; D013053:Spectrophotometry
chemical_list: D000894:Anti-Inflammatory Agents, Non-Steroidal; D010894:Piroxicam; D009288:Naproxen; C051024:5'-hydroxypiroxicam