title: Extractive spectrophotometric methods for determination of zolmitriptan in tablets.
abstract: Two simple and sensitive extractive spectrophotometric methods have been developed for determination of zolmitriptan (ZTP) in tablets. These methods are based on the formation of yellow ion-pair complexes between ZTP and tropaeolin OO (TPOO) and bromothymol blue (BTB) in citrate-phosphate buffer of pH 4.0 and 6.0, respectively. The formed complexes were extracted with dichloromethane and measured at 411.5 and 410 nm for TPOO and BTB, respectively. The best conditions of the reactions were studied and optimized. Beer's law was obeyed in the concentration ranges of 2-20 and 1.5-17 microg/mL with molar absorptivities of 1.42 x 10(4) and 1.60 x 10(4) L/mol/cm for the TPOO and BTB methods, respectively. Correlation coefficients were 0.9998 and 0.9999 for TPOO and BTB methods, respectively. Limits of detection of the TPOO and BTB methods were 0.341 and 0.344 microg/mL, respectively, and the limits of quantitation were 1.034 and 1.051 microg/mL, respectively. Sandell's sensitivity and stability constant were also calculated. The proposed methods have been applied successfully for the analysis of the drug in its dosage forms. No interference was observed from excipients present in tablets. Statistical comparison of the results with those obtained by a high-performance liquid chromatography method showed excellent agreement and indicated no significant differences in accuracy and precision.
authors.affiliation: Istanbul University, Faculty of Pharmacy, Department of Analytical Chemistry, 34116 Beyazit, Istanbul, Turkey. aydogmus@istanbul.edu.tr
authors.forename: Zeynep
authors.initials: Z
authors.lastname: Aydogmus
authors.forename: Ipek
authors.initials: I
authors.lastname: Inanli
mesh_terms: D001391:Azo Compounds / Q000494:pharmacology; D001979:Bromthymol Blue / Q000032:analysis; D002623:Chemistry Techniques, Analytical / Q000379:methods*; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D006863:Hydrogen-Ion Concentration; D008752:Methylene Chloride / Q000032:analysis; D008956:Models, Chemical; D023303:Oxazolidinones / Q000032:analysis*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D017366:Serotonin Receptor Agonists / Q000032:analysis*; D012997:Solvents / Q000737:chemistry; D013053:Spectrophotometry / Q000379:methods*; D013056:Spectrophotometry, Ultraviolet / Q000379:methods; D013607:Tablets / Q000737:chemistry*; D014363:Tryptamines / Q000032:analysis*
chemical_list: D001391:Azo Compounds; D023303:Oxazolidinones; D017366:Serotonin Receptor Agonists; D012997:Solvents; D013607:Tablets; D014363:Tryptamines; C089750:zolmitriptan; D008752:Methylene Chloride; D001979:Bromthymol Blue; C005863:tropaeolin OO