Keywords:
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| Rasagiline Mesylate, Validation, UV Spectrophotometric. |
INTRODUCTION:
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| Parkinson's disease is degenerative disorder of the central nervous system. It results from the death of dopamine-generating cells in the substantia nigra which is a region of the midbrain. The cause of cell-death is unknown[1]. Rasagiline mesylate (Figure 1) is a new molecule which acts as irreversible monoamine oxidase inhibitor used for the treatment of idiopathic parkinson’s disease. Chemical name for Rasagiline mesylate is (R)-2, 3- dihydro-N-2-propynyl-1H-inden-1-amine methanesulfonate, Molecular Formula is C13H17NO3S and Molecular Weight is 267.34 g/mol[2,3]. |
| Rasagiline Mesylate is not official in any Pharmacopoeia. Literature survey reveals that U.V Spetrophotometric method for the determination of Rasagiline Mesylate in bulk and pharmaceutical formulations employed distilled water as solvent. The drug in aqueous solution showed absorption maxima at 271.6 nm[4]. A rapid and sensitive liquid chromatography-tandem mass spectrometry is also developed and validated for assay and has been applied to human pharmacokinetic studies[5]. Literature search also showed a RP-HPLC method for estimation of Rasagiline Mesylate in bulk and tablet dosage form[6] and a stability indicating HPTLC method for its analysis in tablet dosage form[7]. Already published UV spectrophotometric method employs water as a solvent for the assay of Rasagiline Mesylate. Since Rasagiline mesylate is absorbed from the upper portion of small intenstine, henceforth Phosphate buffer pH 6.8 was used in the study. The present paper describes the development and validation of UV spectrophotometric method for assay of rasagiline mesylate in tablet dosage form. |
Materials and Methods:
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| Instrument and Materials: Only AR grade chemicals and solvents were used for analysis of Rasagiline mesylate. The reference standard Rasagiline Mesylate (99.50 % w/w) was obtained from Lupin Pharmaceuticals Limited, Pune (Maharashtra, India). The commercial formulation Rasalect 0.5 mg (Sun pharmaceutical Limited, India, Label claim- Rasagiline Mesylate-0.5 mg), was purchased from local market. |
| The spectrometer used was Shimadzu UV (1800 model, Japan) with 1 cm matched quartz cells, spectral bandwidth of 3 nm and wavelength accuracy of 0.5 nm connected to computer loaded with UV Prob Software. Digital balance of Shimadzu (AX200, Japan) and Sonicator of Spectrolab ultrasonicator (UCB 40, Germany) were used. All the instruments and apparatus were calibrated and validated as per calibration and validation protocol. |
| Experimental Methods: |
| Preparation of standard solution: |
| Stock standard solution was prepared by dissolving 100 mg of Rasagiline Mesylate in 100 ml Phosphate Buffer pH 6.8 (1000 μg/ml). The working standard solution of 100μg/ml was prepared and scanned in the range of 400-200 nm against solvent Phosphate Buffer pH 6.8 as blank. The standard solutions were prepared by dilution of the stock solution with Phosphate Buffer pH 6.8 to reach a concentration range of 100 μg/ml -300 μg/ml of Rasagiline Mesylate. |
| Preparation of sample solution for assay: |
| For the present work Rasalect tablet (Sun pharmaceutical Limited, India, label claim: 0.5 mg of Rasagiline Mesylate per tablet) was selected. To determine the content of Rasagiline Mesylate in Rasalect, twenty tablets were weighed and powdered. Average weight of powder equivalent to 10 mg of Rasagiline Mesylate was transferred to 50 ml volumetric flask and dissolved in about 30 ml of Phosphate Buffer pH 6.8 (200μg/ml). This was sonicated for 10 minutes. Finally, the volume was made up to the mark using same solvent. The solution was then filtered through syring filter (PVDF, 0.45μm) and this solution was analyzed at 265 nm (Table 1). |
| Validation of the developed method: |
| The developed method was validated as per ICH guidelines[8] for the following parameters. |
| Linearity and range: |
| The standard solutions were prepared by dilution of the stock solution with Phosphate Buffer pH 6.8 in the range of 100-300 μg/ml. The spectrums of these solutions were recorded and overlay spectra was taken (Figure 2). The Absorbances were measured at 265 nm and plotted against the corresponding concentrations to obtain the calibration graph (Figure 3). |
| Precision: |
| Intra and inter-day precision studies were performed by measuring the absorbance of standard solution of 200μg/ml at 6 independent series in the same day and three subsequent days within a week respectively. The percentage relative standard deviation (%RSD) was calculated (Table 2). |
| Limit of Detection (LOD) and Limit of Quantitation (LOQ): |
| LOD and LOQ were calculated using the formulae as LOD = 3.3 (SD)/S and LOQ = 10 (SD)/S, where S is average value of slopes of calibration plots and SD is calculated using values of y intercepts of regression equations. |
| Accuracy: |
| Recovery studies were carried out by applying the method to drug sample at which Rasagiline Mesylate corresponding to 50, 100, 150% of label claim was present. Total three determinations at each level were performed and the results were expressed as % RSD (Table 3). |
RESULT AND DISCUSSIONS:
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| The standard solution of Rasagiline Mesylate, when scanned in UV range, showed the λmax at 265 nm. Linear relationships between drug concentrations were obtained over the range of 100-300μg/ml. Assay of Rasagiline Mesylate tablet formulation was successfully performed and the percentage purity of tablet was found to be 100.46%. Percent relative standard deviation values for the intra-day and inter-day precision were found to be satisfactory. The limit of detection and limit of quantitation values were found to be 2.915μg/ml and 8.833μg/ml respectively. Results of the accuracy studies indicated good recovery of the drug. No interference from the excipients of tablet formulation was found. The summary of validation parameters is shown in (Table 4). |
CONCLUSION:
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| A simple, accurate and precise UV Spectrophotometric method for estimation of Rasagiline Mesylate was developed. The method is suitable for routine estimation of Rasagiline Mesylate in pharmaceutical tablet dosage form as it is an immediate release formulation. |
Acknowledgements:
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| The authors are thankful to Lupin pharmaceuticals Limited India, for pure Rasagiline Mesylate sample, Dr. K. N. Gujar, Principal of Sinhgad college of Pharmacy, Vadgaon, Pune, for providing required facilities for research work. |
Tables at a glance
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Figures at a glance
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