title: Rapid determination of nimesulide in rabbit aqueous humor by liquid chromatography.
abstract: A rapid method was developed for quantification of nimesulide (methanesulfonamide, N-[4-nitro-2-phenoxyphenil]) in rabbit aqueous humor. The analyses were performed by high-performance liquid chromatography using a C(18) reversed-phase column (Ultracarb ODS) with UV detection at 300 nm. The mobile phase consisted of acetonitrile-water containing 1% triethylamine (TEA) adjusted to pH 3.2 with orthophosphoric acid. The retention time was 4.5 min. A simple pre-treatment with acetonitrile was used to deproteinize aqueous humor samples. The limit of quantitation was 50 ng/ml. The recovery was over 90%. The relationship between peak areas and concentration was linear over the range between 0.05 and 2.5 microg/ml, with r(2) values over 0.99. The assay provided good reproducibility and accuracy and proved to be suitable for pharmacokinetic studies of nimesulide.
authors.affiliation: Bausch & Lomb Oftal, Corso Italia 141, 95127 Catania, Italy.
authors.forename: Adriana
authors.initials: A
authors.lastname: Maltese
authors.forename: Francesco
authors.initials: F
authors.lastname: Maugeri
authors.forename: Claudio
authors.initials: C
authors.lastname: Bucolo
mesh_terms: D000818:Animals; D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000032:analysis* / Q000493:pharmacokinetics; D001082:Aqueous Humor / Q000737:chemistry*; D002138:Calibration; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D008297:Male; D011817:Rabbits; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013449:Sulfonamides / Q000032:analysis* / Q000493:pharmacokinetics
chemical_list: D000894:Anti-Inflammatory Agents, Non-Steroidal; D013449:Sulfonamides; C012655:nimesulide