Determination of sertaconazole in pharmaceutical preparations by capillary zone electrophoresis

Capillary electrophoresis separation of aminoalkanol derivatives of 1,7-dimethyl-8,9-diphenyl-4-azatricyclo[5.2.1.0(2,6)]dec-8-ene-3,5,10-trione as potential anticancer drugs

The purpose of this study, the direct separation of aminoalkanol derivatives I and II of 1,7-dimethyl-8,9-diphenyl-4-azatricyclo[5.2.1.0(2,6) ]dec-8-ene-3,5,10-trione, which was found in earlier studies as potential anticancer drugs, were performed. Capillary electrophoresis offers the possibility of fast, cheap, and reproducible separations for compounds I and II. In this paper, the simultaneous separation of I and II by capillary zone electrophoresis has been achieved within 8 min by use of 50 mM phosphate buffer of pH 2.5. Analysis of the two compounds in the serum plasma standards was conducted. Limits of detection of I and II by UV absorbance at 200 nm were achieved in the range of 156.3-156.6 ng/mL. The method was validated for linearity, accuracy, precision, limits of detection, and quantification. The calibration equation revealed a good linear relationship (r(2) = 0.998-0.999). Sufficient recovery was observed in the range of 96.3-99.5%. The method showed good reproducibility with intra- and interday precision of 0.97 and 1.76%, respectively. The quantification limits for the compounds were in the range of 477.0-479.8 ng/mL. The proposed method was applied to the analysis of real serum samples.

A validated LC-MS/MS method for determination of sertaconazole nitrate in human plasma

A specific and sensitive liquid chromatography electrospray ionization tandem mass spectrometric (LC-ESI-MS/MS) method for quantitative determination of sertaconazole in human plasma was developed. The analysis was performed and validated in positive ion multiple reactions monitoring mode using loratadine as an internal standard (IS). Sample preparation involved one-step liquid-liquid extraction using ether-dichloromethane (80/20, v/v). Sertaconazole and IS was separated on a C18 column using isocratic elution with a mobile phase of methanol: 0.2% formic acid aqueous solution (70:30, v/v,) at the flow rate of 0.2 mL/min. The transition monitored were m/z 439 [M+H](+)-->m/z 181 for sertaconazole and m/z 383[M+H]+ --> m/z 337 for IS. The lower limit of quantification was 0.1 ng/mL based on 500 microL of plasma, and no interferences were detected in chromatograms. Calibration curve was linear over the range of 0.1-10 ng/mL, and correlation coefficients were 0.999. Intra- and inter-day assay variations were <10%, and the accuracy values were between -0.4% and 9.0% relative error (RE). The extraction recoveries ranged from 60% to 70% across the calibration curve range. The described method provides a sensitive analytical tool to determine sertaconazole in plasma, and was successfully applied to a pharmacokinetic study in 10 healthy human subjects after administration of 300 mg vaginal suppository formulation of sertaconazole nitrate.

Validation of a rapid micellar electrokinetic capillary chromatographic method for the simultaneous determination of isoniazid and pyridoxine hydrochloride in pharmaceutical formulation

An efficient and reliable micellar electrokinetic capillary chromatography (MEKC) method has been developed for the simultaneous determination of isoniazid (ISO) and pyridoxine hydrochloride (PYR) in pharmaceutical formulations. A chemometric two level full factorial design approach was used to search for the optimum conditions of separation. Three parameters were selected for this study: the buffer pH, the buffer concentration and sodium dodecyl sulphate (SDS) concentrations. Resolution, peak symmetry and analysis time were established as response. The two analytes were separated within 6 min with the optimized conditions: 50 mM borate buffer, 25 mM SDS pH 7.8, 35 degrees C, at 50 mbar 4s injection and 30 kV by using a fused silica capillary (72 cm effective length, 50 microm i.d.). The detection wavelength was set to 205 nm. Meloxicam was used as internal standard. The method was validated with respect to stability, linearity range, limit of quantitation and detection, precision, accuracy, specificity and robustness. The detection limits of the method were 1.0 microg mL(-1) for ISO and 0.40 microg mL(-1) for PYR and the method was linear at least in the range of 3.0-100 microg mL(-1) for ISO and 1.0-100 microg mL(-1) for PYR with excellent correlation coefficients (0.9995 for ISO and 0.9998 for PYR). Relative standard deviations (R.S.D.s) of the described method ranged between 0.54 and 2.27% for intra-day precision and between 0.65 and 2.69% for inter-day precision. The developed method was applied to the tablet form of ISO and PYR-containing the pharmaceutical preparations and the data were compared with obtained from the standard addition method. No statistically significant difference was found.