title: Novel determination of nabumetone, a cox-2 inhibitor precursor via its 4-carboxyl-2,6-dinitrobenzene diazonium (CDNBD) derived AZO dye.
abstract: A novel colorimetric determination ofnabumetone in tablets has been developed. The assay is based on chemical derivatization (aromatic ring derivatization technique) using newly developed 4-carboxyl-2,6-dinitrobenzene diazonium (CDNBD) ion as the chromogenic derivatizing reagent and resultant formation of azo dye.Optimization studies established an optimal reaction time of 10 minutes at 30 degrees C after mixing the drug/reagent mixture in a vortex mixer for 10 sec. A new absorption maximum (ë(max)) was found at 470 nm, which was selected as analytical wavelength. The assays were linear over 1-6 microg/ml of nabumetone and the optimal reaction required a 2:1 reagent/drug stoichiometric ratio. The developed method has a low limit of detection of 0.39 microg/ml, and is reproducible (1.81% RSD). It has been applied successfully to the assay of nabumetone tablets and is of equivalent accuracy (p > 0.05) with the official (B.P) HPLC method. The new method is simple, has the main advantage of employing a more affordable instrumentation and could find application in routine in-process quality control of nabumetone tablets.
authors.affiliation: Department of Pharmaceutical Chemistry, Faculty of Pharmacy, University of Ibadan, Ibadan, Nigeria.
authors.forename: A O
authors.initials: AO
authors.lastname: Adegoke
authors.forename: S O
authors.initials: SO
authors.lastname: Idowu
authors.forename: A A
authors.initials: AA
authors.lastname: Olaniyi
mesh_terms: D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000494:pharmacology*; D002074:Butanones / Q000494:pharmacology*; D002151:Calorimetry; D002851:Chromatography, High Pressure Liquid; D052246:Cyclooxygenase 2 Inhibitors / Q000494:pharmacology; D003979:Diazonium Compounds; D004355:Drug Stability; D006801:Humans; D000077430:Nabumetone; D013607:Tablets
chemical_list: C504881:4-carboxyl-2,6-dinitrobenzenediazonium ion; D000894:Anti-Inflammatory Agents, Non-Steroidal; D002074:Butanones; D052246:Cyclooxygenase 2 Inhibitors; D003979:Diazonium Compounds; D013607:Tablets; D000077430:Nabumetone