Simultaneous determination of cyproterone acetate and ethinylestradiol in tablets by derivative spectrophotometry.
Derivative spectrophotometry offers a useful approach for the analysis of drugs in multi-component mixtures. In this study a third-derivative spectrophotometric method was used for simultaneous determination of cyproterone acetate and ethinylestradiol using the zero-crossing technique. The measurements were carried out at wavelengths of 316 and 226 nm for cyproterone acetate and ethinylestradiol respectively. The method was found to be linear (r2>0.999) in the range of 0.5-6 mg/100 ml for cyproterone acetate in the presence of 35 microg/100 ml ethinylestsradiol at 316 nm. The same linear correlation (r2>0.999) was obtained in the range of 10-80 microg/100 ml of ethinylestradiol in the presence of 2 mg/100 ml of cyproterone acetate at 226 nm. The limit of determination was 0.5 mg/100 ml and 10 microg/100 ml for cyproterone acetate and ethinylestradiol respectively. The method was successfully applied for simultaneous determination of cyproterone acetate and ethinylestradiol in pharmaceutical preparations without any interferences from excipients.
Souri
Effat
E
Department of Medicinal Chemistry, Faculty of Pharmacy and Pharmaceutical Research Center, Tehran University of Medical Sciences, Tehran (14155-6451), Iran. souri@sina.tums.ac.ir
Jalalizadeh
Hassan
H
Farsam
Hassan
H
Ghadiri
Roksana
R
Amanlou
Massoud
M
D002138:Calibration; D017373:Cyproterone Acetate / Q000032:analysis*; D004355:Drug Stability; D004997:Ethinyl Estradiol / Q000032:analysis*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013056:Spectrophotometry, Ultraviolet / Q000379:methods*; D013607:Tablets / Q000737:chemistry*
D013607:Tablets; D004997:Ethinyl Estradiol; D017373:Cyproterone Acetate