RP-HPLC METHOD DEVELOPMENT AND VALIDATION OF CAPECITABINE EXTENDED RELEASE TABLET DOSAGE FORM

RP-HPLC METHOD DEVELOPMENT AND VALIDATION OF CAPECITABINE EXTENDED RELEASE TABLET DOSAGE FORM

A. Santosh Kumar Sreevatsav* and A.K. Harishbabu

MRR Institute of Pharmacy, Nadergul, Saroornagar, Andhra Pradesh, India

ABSTRACT: A Simple, Rapid, Precise, Accurate, Robust and Stability indicating Reverse Phase HPLC method has been developed to estimate Capecitabine in tablet dosage form using mobile phase mixture consisting of Phosphate buffer : Acetonitrile (80:20) v/v at the flow rate of  1.2ml/min. The Hypersil BDS C8 column (250mm x 4.6mm x 5mm) was used as the stationary phase. The mobile phase was run for 15 min at the wavelength of 240 nm. The mean recovery was found to be 99.91%. The linearity range was 50% to 150% and was found to be successful under 0.999. The proposed method has fulfilled all the validation parameters such as linearity, Robustness, Accuracy, System Precision, intermediate precision, method precision, solution stability.

Capecitabine tablets, RP-HPLC, Stability, Acetonitrile, Recovery

INTRODUCTION:Capecitabine ¹ CAP (N4-Pentoxy carbonyl-5-deoxy-5-fluorocytidine) is an anti-cancer prodrug of 5 FluoroUracil (5-FU) that was designed to undergo preferential conversion to 5FU within tumors ^{2, 3, 6}.

The activation of Capecitabine follows a pathway with three enzymatic steps and two intermediate metabolites, 5’ deoxy-5 fluorocytidine (5’-DFCR) and 5’-deox-5-fluorouridine (5’-DFUR) to form 5-fluoro Uracil.

Extensive pharmacokinetic studies have been performed on Capecitabine and its metabolites base on phase II and III trials ^4-9. A very few physic chemical methods appeared in the literature survey for Capecitabine in biological fluids and pharmaceutical formulations.

Most of them are based upon HPLC, LC-UV, LC-MS, LC-MS/MS ^{8, 12} methods for its determination in Human plasma and Pharmaceutical dosage forms ¹⁰. The present work aims to develop simple, selective, accurate, linear, robust, precise and stable method for the estimation of capecitabine in tablet dosage forms by Reverse phase HPLC using UV detector ¹¹.

Structure:

CAPECITABINE

MATERIALS AND METHODS:

Instruments / Equipments Required: High performance liquid chromatograph, with UV / PDA detector, HPLC Analytical column of BDS Hypersil, C₈, 250mm x 5mm x 5µ, Analytical weighing balance - Mettler Toledo B204S, Millipore Nylon 0.2µm, Laboratory accessories.

Chemicals Required: Capecitabine working standard, Caplive (Capecitabine Tablets IP 500mg) Tablets, Placebo or Excipient mixture (about 100g), Potassium Dihydrogen Ortho Phosphate – AR, Acetonitrile – AR, Orthophosphoric Acid - AR

Analytical method: The quantitative determination is carried out by HPLC system equipped with UV/VIS detector.

a)      Preparation of Capecitabine Standard Solution: Weigh accurately about 25 mg of Capecitabine working standard and transfer to a 25 ml volumetric flask. Add 10 ml of diluent and sonicate to dissolve. Dilute to volume with diluent and mix. Transfer 1.0 ml of solution into a 10 ml of volumetric flask and dilute to volume with the diluent and mix.

(Dilution scheme: 25mg ® 25.0 ml ® 1 ml /10.0 ml)

b)     Preparation of Test Solution: Weigh and transfer 40mg of sample powder into a 25 ml volumetric flask. Add about 10 ml of diluent and shake for 20 minutes by mechanical means or manually and further sonicate for 30 minutes. Dilute up to mark with diluent. Centrifuge this solution at 8000 rpm for 10 minutes. Decant the supernatant solution into another test tube and transfer 1.0 ml of supernatant solution into another 10 ml volumetric flask and make up the volume with diluent. Further transfer 1.0ml of solution into another 10 ml volumetric flask and make up the volume with diluent.  Filter the solution through 0.2µm nylon membrane filter.

(Dilution scheme: 40 ® 25 ml ® 1 ml ®10.0 ml)

System Suitability Solution: Use Capecitabinestandard working solution as system suitability solution.

Procedure: Separately inject equal volumes of blank, five replicate injections of system suitability solution (Capecitabinestandard working solution). Then inject two injections of test solution and record the chromatograms. Disregard any peak due to blank in the test solution. Calculate % RSD of five replicate injections of system suitability solution (Capecitabinestandard working solution). Check tailing factor and theoretical plates of the peak in the chromatogram obtained with 5^th injection of system suitability solution (Capecitabinestandard working solution).

The limits are as below,

1)      Theoretical plates should be not less than 3000.

2)      Tailing factor should be less than 2.0.

3)      % RSD should be not more than 2.0%.

Injection scheme:

Calculations:

AT: Average Peak area of Capecitabine in test solution; AS: Mean peak area of Capecitabine in system suitability solution; WS: Weight of Capecitabine working standard taken in mg; WT: Weight of Tablet powder taken in mg; P: Assay of Capecitabine working standard in % on as is basis; L.C.: Label Claim; LOD: Loss on drying; Express the results up to two decimals.

RESULTS AND DISCUSSIONS: The system suitability parameters were monitored throughout the validation study and are recorded in the validation report.

The validation data is summarized below:

Specificity / Selectivity: Selectivity was performed by injecting the diluent blank solution, system suitability solution, test solution.

Acceptance criteria: The Capecitabine peak should be well resolved from any other peak and from each other.

The diluent blank solution, excipient blend solution should not show any peak at the retention time of the Capecitabine.

Results: The system suitability criteria were found to meet the pre-established acceptance criteria as per the analytical method (table 1).

TABLE 1: SYSTEM SUITABILITY - SELECTIVITY

All the injections were processed at the wavelength provided in the method. There was no interference observed from diluent blank solution, excipient blend solution with Capecitabine peak.

Linearity:

Linearity and Range for standard: For the linearity study five standard solutions of Capecitabine were prepared from the range starting from 50% to 150% of the theoretical concentration of assay preparation.

The system suitability solution and the linearity solutions were injected as per the protocol. The linearity graph of concentration against peak response was plotted and the correlation coefficient was determined.

Acceptance criteria: Correlation coefficient should be greater than or equal to 0.999.

Results: The system suitability criteria were found to meet the pre-established acceptance criteria as per the analytical method. (Refer to Table 2 for system suitability results).

TABLE 2: SYSTEM SUITABILITY - LINEARITY OF STANDARD

The average peak area of Capecitabine peak at each concentration level was determined and the linearity graph was plotted against the sample concentration in percentage. The results of linearity study are as given in Table 3.

  TABLE 3: RESULTS OF LINEARITY OF STANDARD

The linearity plot of peak area of Capecitabine Vs. standard concentration in percentage is presented in figure 1.

FIGURE 1: LINEARITY GRAPH OF CAPECITABINE STANDARD

Linearity and Range for standard in presence of placebo:

Procedure: For the linearity study five standard solutions of Capecitabine were prepared from the range starting from 50% to 150% of the theoretical concentration of assay preparation.

The system suitability solution and the linearity solutions were injected as per the protocol. The linearity graph of concentration against peak response was plotted and the correlation coefficient was determined.

Acceptance criteria: Correlation coefficient should be greater than or equal to 0.999.

Results: The system suitability criteria were found to meet the pre-established acceptance criteria as per the analytical method (Refer to Table 4 for system suitability results).

TABLE 4: SYSTEM SUITABILITY - LINEARITY OF STANDARD IN PRESENCE OF PLACEBO

The average peak area of Capecitabine peak at each concentration level was determined and the linearity graph was plotted against the sample concentration in percentage. The results of linearity study are as given in Table 5.

TABLE 5: RESULTS OF LINEARITY OF STANDARD IN PRESENCE OF PLACEBO

 The linearity plot of peak area of Capecitabine Vs. standard concentration in presence of placebo in percentage is presented in figure 2.

Precision:

System Precision:

Procedure: The system precision was performed by injecting 10 replicate injections of system suitability solution and the chromatograms are reviewed for the system suitability criteria.

Acceptance criteria: % RSD of peak areas of ten replicate injections of system suitability solution should not be more than 2.0% and system suitability criteria should pass as per analytical method.

Results: The system suitability criteria were found to meet the pre-established acceptance criteria as per the analytical method. The system suitability criterion was found to meet the pre-established acceptance criteria as per the analytical method. The results of assay obtained from six test solutions preparations are presented in Table 6.

FIGURE 2: LINEARITY GRAPH OF CAPECITABINE STANDARD IN PLACEBO

TABLE 6: SYSTEM PRECISION

Method Precision:

Procedure: Six test solutions of Capecitabine in Caplive Tablets were prepared as per the analytical method. The % RSD of % assay of six test solutions was calculated.

Acceptance criteria: % RSD of the results of six test solutions should not be more than 2.0%.

Results: The system suitability criterion was found to meet the pre-established acceptance criteria as per the analytical method. The results of assay obtained from six test solutions preparations are presented in Table 8. The system suitability criteria were found to meet the pre-established acceptance criteria as per the analytical method (Refer to Table 7 for system suitability results).

TABLE 7: SYSTEM SUITABILITY - METHOD PRECISION

ANALYST – 1

TABLE 8: RESULTS OF METHOD PRECISION

FIGURE 3: METHOD PRECISION

 Intermediate Precision:

Procedure: Six test solutions of Caplive Tablets Extended Release Tablets and were prepared as per the analytical method on different day. These test solutions were analyzed by a different analyst using different HPLC column of same make but having different serial number and different HPLC system. The % RSD of % assay results of twelve test solutions (six samples from method precision and six samples from intermediate precision) was calculated.

Acceptance criteria: % RSD of the results of twelve test solutions (six of method precision and six of intermediate precision) should not be more than 2.0%.

Results: The system suitability criteria were found to meet the pre-established acceptance criteria as per the analytical method. (Refer to Table 9 for system suitability results). The results of assay obtained from six test solutions are presented in Table 10. % RSD of assay results from method precision and intermediate precision (12 results) are presented in Table 11.

TABLE 9: SYSTEM SUITABILITY - INTERMEDIATE PRECISION

ANALYST – 2

TABLE 10: RESULTS OF INTERMEDIATE PRECISION

FIGURE 4: INTERMEDIATE PRECISION

TABLE 11: RESULTS OF TWELVE TEST SOLUTIONS OF CAPECITABINE IN CAPLIVE TABLETS (six of method precision & six of intermediate precision)

Thus, the method is found to be rugged and precise.

Accuracy (% Recovery):

Procedure: Accuracy study was performed by analyzing Capecitabine test solutions which were prepared by mixing Capecitabine API with excipient blend.

These test solutions were prepared by adding a quantity of Capecitabine API to excipient blend to produce three different concentration solutions equivalent to 50%, 75%, 100%, 125% and 150% of test concentration.

Acceptance criteria: Mean recovery at each concentration level should be between 97.0% and 102.0%.

Results: The system suitability criteria were found to meet the pre-established acceptance criteria as per the analytical method (Refer to Table 12 for system suitability result). The results of accuracy study obtained are presented in Table 13.

 TABLE 12: SYSTEM SUITABILITY - ACCURACY (%RECOVERY)

TABLE 13: ACCURACY (%RECOVERY) – RESULTS

 Remarks: The percentage recovery for Capecitabine at each level lies between 97.0% and 102.0%. % RSD at each recovery level is less than 2.0%. The analytical method meets the pre-established acceptance criteria for recovery study as per protocol.

Hence, it is concluded that the method is accurate.

FIGURE 5: ACCURACY/RECOVEERY

Acceptance criteria: System suitability criteria should pass as per analytical method and the % RSD between results obtained with changed condition and average result of method precision should not be more than 2.0%.

Robustness:

Experiment: Prepare two test solutions of the same lot (as used in 7.0.a and 7.0.b) of Capecitabine in Caplive (Capecitabine Tablets IP 500mg) as per analytical method. Inject this solution along with diluent blank solution and system suitability solution along different chromatographic conditions as shown below:

Change in column lot (same make, different serial no.)

Change in flow rate (± 0.2 ml/minute)

Change in wavelength (± 2 nm)

Change in pH of mobile phase (± 0.2)

Change in Column Lot:

[Normal Experimental Condition:Hypersil BDS C8, 250, 5mm). The system suitability criteria were found to meet the pre-established acceptance criteria as per the analytical method. (Refer to Table 14 for system suitability results).

 TABLE 14: SYSTEM SUITABILITY - ROBUSTNESS WITH CHANGE IN COLUMN LOT

The assay results obtained with different flow rate conditions are as given in Table 15.

TABLE 15: RESULTS FOR CHANGE IN COLUMN LOT

Change in Flow Rate (± 0.2 mL/minute): (Normal Experimental Condition: 1.2ml/minute)

The system suitability criteria were found to meet the pre-established acceptance criteria as per the analytical method. (Refer to Table 16 for system suitability results).

TABLE 16: SYSTEM SUITABILITY - ROBUSTNESS WITH CHANGE IN FLOW RATE

The assay results obtained with different flow rate conditions are as given in Table 17.

Table 17: Results for change in flow rate

Change in Wavelength (± 2 nm): (Normal Experimental Condition: 240nm)

The system suitability criteria were found to meet the pre-established acceptance criteria as per the analytical method. (Refer to Table 18 for system suitability results).

TABLE 18: SYSTEM SUITABILITY - ROBUSTNESS WITH CHANGE IN WAVELENGTH

The assay results obtained with different wavelength conditions are as given in Table 19.

TABLE 19: RESULTS FOR CHANGE IN WAVELENGTH

Change in pH of Mobile Phase (± 0.2 units): (Normal Experimental Condition: pH = 4.0)

The system suitability criteria were found to meet the pre-established acceptance criteria as per the analytical method (Refer to Table 20 for system suitability results).

TABLE 20: SYSTEM SUITABILITY - ROBUSTNESS WITH CHANGE IN PH OF MOBILE PHASE

The assay results obtained with change in pH of mobile phase are as given in Table 21.

TABLE 21: RESULTS FOR CHANGE IN PH OF MOBILE PHASE

 Remarks: The analysis of the same lot of CAPLIVE TABLETS was carried out at different conditions of column lot, flow rate, wavelength, and pH of mobile phase. The system suitability was found to meet the pre-established criteria at all the conditions and the % RSD between results obtained with changed condition and average result of method precision is not more than 2.0%. The analytical method meets the pre-established acceptance criteria for robustness study as per protocol. Thus, the method is robust.

Stability of Analytical Solution:

Procedure: System suitability solution and test solution of  CAPLIVE TABLETS were prepared on  0^th,12^th, 24^th, 36^th and 48^th hour of experiment and stored these solutions at room temperature for every time interval up to 48 hrs and analyzed these solutions on 48 hrs with freshly prepared test solution. The system suitability solution was prepared freshly at the time of analysis.

The assay of CAPLIVE TABLETS in the sample was calculated.

Acceptance criteria: The analyte is considered stable if there is no significant change in % assay.

Results: The system suitability criteria were found to meet the pre-established acceptance criteria as per the analytical method (Refer to Table 22 for system suitability results).

TABLE 22: SYSTEM SUITABILITY - SOLUTION STABILITY

 TABLE 23: RESULTS FOR SOLUTION STABILITY

 Remark: The system suitability was found to meet the pre-established criteria and the % RSD between assay results obtained for freshly prepared test solution and the stored test solutions is less than 2.0%. There is no significant change in assay level observed up to 48Hrs for test solution at room temperature. Thus, it can be concluded that the solution is stable upto 48Hrs at room temperature.

LIST OF ABBREVIATIONS

 CONCLUSION: The above performed method development and validation of Capecitabine HCl tablet dosage form is rapid, precise, accurate and inexpensive and stability indicating method. It has got all he values under the limits set by ICH.

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    How to cite this article:

    Sreevatsav ASK and Harishbabu AK: RP-HPLC method development and validation of Capecitabine Extended Release Tablet dosage form. Int J Pharm Sci Res 2013; 4(11): 4477-87. doi: 10.13040/IJPSR. 0975-8232.4(11).4477-87

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