Keywords:
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| Drotaverine Hydrochloride(DRT), Aceclofenac(ACE), spectrophotometric method. |
INTRODUCTION
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| Drotaverine hydrochloride (DRT), 1-[(3, 4-diethoxy phenyl) methylene]-6, 7-diethoxy-1, 2, 3, 4-tetra hydro isoquinolene is an analogue of papaverine [The Merck Index 13th, 2001]. It acts as an antispasmodic agent by inhibiting phosphodiesterase IV enzyme, which is specific for smooth muscle spasm and pain, used to reduce excessive labor pain. A few UVspectrophotometric[ 1][2] and HPLC[3][4][5] methods have been reported individually or in combination with other drugs for estimation of Drotaverine Hydrochloride. |
| Aceclofenac (ACE) is chemically designated as 2-(2, 6- Dichloroanalino) phenyl acetoxy acetic acid. It is a NSAID, used in the management of osteoarthritis, rheumatoid arthritis, and ankylosing spondylitis [The Merck Index 13th, 2001]. Aceclofenac is official in Indian pharmacopoeia [Indian pharmacopoeia 2007]. Various UVspectrophotometric[ 6][7] and HPLC[8][9] methods for aceclo-fenac have been reported for its estimation individually or in combination with other drugs. |
MATERIALS AND METHODS
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| Chemicals & Reagents: |
| Analytically pure DRT and ACE were obtained as gift samples Commercial tablet formulation (DROLGAN) was purchased from the local market. All chemicals and reagents used were of Analytical Grade obtained from Merck. |
| Instrument: |
| SHIMADZU double beam UV/Visible recording spectrophotometer (Model: UV-1800) with 2 nm spectral bandwidth was employed for all spectrophotometric measurement. A 10mm matchedquartz cell and Borosil glass wares were used for the study. Calibrated electronic single pan balances Sartorius CP 225 D, pH Meter (LABINDIA), Enertech Fast Clean Ultrasonicator were also used during the analysis. |
| Standard Stock Solution |
| The standard stock solutions of DRT and ACE were prepared by dissolving accurately weighed 100 mg of drug in 100 ml of a mixture of ethanol and distilled water (50:50) in two separate 100 ml volumetric flasks to get a concentration of 1000 μg/mL. Both were appropriately diluted with mixture of ethanol and distilled water (50:50) to get a concentration of 100μg/ml and were kept as the stock solutions. |
| Determination of ,max |
| The standard solution of both DRT and ACE (10 μg/mL) were scanned in the wavelength region of 200-400 nm and the λmax was found to be 307nm and 276nm respectively. |
| Preparation of calibration curve |
| For each drug, appropriate aliquots were pipettedout from each standard stock solution into a series of 10 ml volumetric flasks. The volume was made up to mark with mixture of ethanol and distilled water (50:50) to get set of solutions having concentration range 4-40 μg/mL for DRT and 5-40 μg/mL for ACE. The prepared solutions of DRT and ACE were scanned at 307 nm and 276 nm respectively. The respective absorbances were recorded and were plotted against the concentrations to obtain their respective calibration curves. |
| Preparation of sample solution |
| The proposed method was successfully applied for the determination of DRT and ACE in tablet dosage form. 20 tablets were weighed and powdered. The amount of tablet powder equivalent to 100 mg of DRT and 80 mg of ACE was weighed accurately and transfered to 50mL mixture of methanol and water and kept for 2 min in sonicator and volume was made up to 100 mL with the same solvent. The solution was then filtered through whatmann f ilter paper. This filtrate was diluted suitably with mixture of methanol and water to get the solution of 8 μg/mL of DRT and 10 μg/mL of ACE concentration. The absorbance was measured against blank. The drug content of the preparation was calculated using standard calibration curve. |
RESULTS AND DISCUSION
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| The analytical method was developed in multicomponent mode of analysis and validated according to ICH guidelines for determination of DRT and ACE in their pharmaceutical dosage form at selected wavelength of 307 nm and 276 nm respectively where there is no interference among the drugs as shown in the overline spectra (Fig.3). |
| Linearty |
| Developed analytical method showslinearity response over the range of 4-40 μg/mL for DRT and 5-40 μg/mL for ACE, With correlation coefficient of 0.999 for the both the drugs. |
| Precision |
| Precision was determined and the results are represented in the form of % RSD which was found to be below 2% and shows that the test was highly précised and results given in table 3. |
| Recovery studies |
| The accuracy of the proposed method was evaluated by adding known amounts of pure drug to its tablet formulation. Three samples were prepared for each recovery level of 80%, 100% and 120% by adding standard solutions of DRT and ACE. The average recovery of marketed formulation was found to be 99.54% and 98.23%for DRT and ACE respectively shown in table 4. |
| LOD & LOQ |
| The absorbance of ten solutions containing 10 μg/mL were measured at 307 nm for DRT and 276 nm for ACE calculated according to equation of LOD [3.3 x MSD/ average response] and LOQ [10 x MSD/ average response]. |
CONCLUSION
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| The optimized method is simple, precise, accurate for simultaneous determination of DRT and ACE in combined tablet dosage form. The method was validated as per ICH guidelines in terms of linearity, accuracy, precision, LOD and LOQ. This method can be used for routine analysis of DRT and ACE both in bulk and tablet dosage forms. |
Tables at a glance
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Figures at a glance
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References
- 1) Dahivelkar PP, Surana SJ. Spectrophotometric method for simultaneous estimation of Drotaverine hydrochloride and Mefenamic acid in bulk and tablet formulation.Indian Drugs.2006; 43: 896-900.
- 2) S.El-Sheikhb R, Zahranb F and El-fetouhGoudab A A. Spectrophotometric determination of PipazethateHCl, Dextromethorphan HBr and DrotaverineHCl in their pharmaceutical preparations. Spectrochim.Acta A. 2007; 67: 1088.
- 3) Dahivelkar PP, Bari SB, Bhoir S, Bhagwat AM. HPLC Estimation of Drotaverine Hydrochloride and Mefenamic Acid in Human Plasma.Iranian J.Pharm.Research.2009; 8: 209-15.
- 4) Mezei J, Kuttel S. A new method for HPLC determination of Drotaverine in plasma.J. Pharm. Sci. 1984; 73: 1489-91.
- 5) Panigrahi D, Sharma R. Development and validation of an RP-HPLC method for simultaneous analysis of Drotaverine and Omeprazole in a tablet dosage form. Journal of ActaChromatographica.2008; 20: 439-50.
- 6) Nikam AD, Sampada SP, Gandhi SV. Estimation of paracetamol and Aceclofenac in tablet formulation by ratio spectra derivative spectroscopy.Indian J.pharm.Sci.2008; 70: 635-7.
- 7) Shah R, MagdumPatil SK, Chougule DK and Naikwade N, Validated Spectroscopic Method for estimation of Aceclofenacfrom tablet formulation.Research J. Pharm. and Tech. 2008; 1: 430-2.
- 8) Momin MY, Yeole PG, Puranik MP, Wadher SJ. Reverse phase HPLC method for determination of Aceclofenac and Paracetamol in tablet dosage form. Indian J. Pharm. Sci. 2006; 68: 387- 9.
- 9) Shaikh K A and Devkhile A B. Simultaneous determination of aceclofenac, paracetamol, and chlorzoxazone by RP-HPLC in pharmaceutical dosage form. J. Chromatogr. Sci., 2008; 46: 649.
