The mixed standards were prepared in 10 ml volumetric flasks as per the concentrations shown in Table GSK1349572 2. All the seven mixed standards were scanned at the respective λ1 and λ2 of PPM i.e. at 263.6 and 257 nm, in the present case CPM was interfering component so by neglecting the absorbance values for CPM the data values of absorbance difference (A1−A2) corresponding to concentrations of PPM were recorded in Table 3. These mixed

standards were scanned in the photometric mode of instrument. The working calibration curve for estimation of PPM at 263.6 and 257.0 corresponding to above data is shown in the Fig. 2. All the seven mixed standards were scanned at the respective λ1 and λ2 for CPM i.e. at 261.6 and 253.2 nm, here PPM acted as interfering component so by neglecting the absorbance values for PPM the data values of absorbance difference (A1−A2) corresponding to concentration of CPM were recorded in

Table 4. These mixed standards were scanned in the photometric mode of instrument. The working calibration curve for estimation of CPM at 261.6 and 253.2 corresponding selleck to above data is shown in the Fig. 3. Five mixed standard solutions were prepared from standard stock solutions as shown in Table 5, these laboratory samples were used to note the absorbance difference values corresponding to PPM at 263.6 and 257.0 nm and for CPM at 261.6 and 253.2 nm. These absorbance difference values were used for estimation of CPM and PPM from standard next calibration plots. Results are shown in Table 5 and

Table 8. Twenty tablets were weighed and the average weight was found (243.26 mg, Labelled to claim 4 mg of CPM and 25 mg of PPM). The tablets were crushed to powder form and 243.26 mg powder was weighed and transferred to 100 ml volumetric flask. 50 ml of distilled water was added and it was shaken for 10 minutes for complete dissolution of drugs. Filtered, using Whatman filter paper no. 44. The volume was made up to mark. The final solution labelled to claim 40 mcg/ml of CPM and 250 mcg/ml of PPM. From this stock solution different dilutions were made and were used as unknown. The unknown samples were analyzed by photometric mode of instrument. The results of commercial samples are recorded in Table 6 and Table 8. The recovery study was carried out by the addition of different concentrations of standard drugs of PPM and CPM to preanalyzed stock solutions of commercial tablet samples as per Table 7. These samples were used to note the absorbance difference values corresponding to PPM at 263.6 and 257 nm and for CPM at 261.6 and 253.2 nm respectively. Results are shown in Table 7 and Table 8.