Received date: 25/09/2012; Revised date: 12/10/2012; Accepted date: 12/11/2012
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A simple, rapid and accurate spectrophotometric method was developed for the determination of sitagliptine in pure and tablet dosage form. The proposed method is based on the principle that sitagliptine exhibiting an absorption spectra of wavelength maxima 267 nm. This method has successfully used for the analysis of drug in marketed preparations in the range of 20-60 μg/ml with correlation coefficient of 0.991. The percentage recovery was found to be 99.62-100.48%. LOD and LOQ were found to be 6.03 and 18.28 μg/ml respectively. This method has been validated for linearity, accuracy and precision and found to be rapid, precise, accurate and economical and can be applied for routine estimation of sitagliptine in solid dosage form. The validation of method was carried out utilizing ICH-guidelines.
sitagliptine, validation, UV-Vis spectroscopy, method development
Sitagliptin phosphate monohydrate (SPM) chemically, (3R)-3-amino-1-[3-(trifluoromethyl)-5,6-dihydro[1,2,4] triazolo[4,3- a]pyrazin-7(8H)-yl]-4-(2,4,5-trifluorophenyl)butan-1-one phos-phate hydrate (Fig. 1) is oral hypoglycemic drug of the dipeptidyl peptidaseÃ¢ÂÂ4(DPPÃ¢ÂÂ4) inhibitor class . DPP-4 inhibitors represent a new therapeutic approach to the treatment of type 2 diabetes that functions to stimulate glucose-dependent insulin release and reduce glucagons levels. This is done through inhibition of the inactivation of in cretins, particularly glucagon-like peptide- 1 (GLP-1) and gastric inhibitory polypeptide (GIP), thereby improving glycemic control2. Several analytical methods based on UV [2-4], Spectroflourimetry  , RP-HPLC [6,7], LC-MS/MS [8-10] was reported for the determination of sitagliptin phosphate in plasma and urine of humans, rats and dogs.
A Shimadzu model 1800 double beam UV-Visible spectrophotometer with spectral width of 1 nm, wavelength accuracy of ± 0.1 nm and a pair of 10 mm matched quartz cell was used to measure absorbance of all the solutions. Spectra were automatically obtained by UV-Probe system software (Ver.2.34).
Reagents and Materials
All chemicals and reagents were used of AR grade. Authentic of SPM was obtained as gift samples from MSD Pharmaceutical private Ltd. Maharashtra, India.
Selection of Detection Wavelength
Solution of drug in was scanned over the range of 200-400 nm. The absorbance maximum was found 267nm.
Preparation of Standard Stock Solutions
SPM was weighed (100 mg) and transferred to 100ml volumetric flasks and dissolved in 50 ml of methanol and make up the volume up to the mark with methanol and the final concentration of solution containing 1000 μg/ml.
Preparation of Working Solutions
Aliquot from the stock solutions of SPM was appropriately diluted with methanol to obtain working standard.
The developed method was validated for its linearity, accuracy, precision and specificity.
The linearity of measurement was evaluated by analyzing different concentrations of the standard solution of SPM. The results are shown in table 1.
To ascertain the accuracy of the proposed method, recovery studies were carried out by standard addition method. The results are shown in table 2.
The precision of the proposed method was determined by analyzing different concentrations (20-60μg/ml) at different time intervals on same day (Intra-day precision) and on three different days (Inter-day precision).
Interference and non-interference of excipients and binders was confirmed by performing the specificity study. Specificity was performed by spiking placebo with standard drug.
LOD and LOQ
The LOD and LOQ were calculated from the equations, LOD =3.3 σ/S and LOQ = 10 σ/S, where σ is the standard deviation of the lowest standard concentration and S is the slope of the standard curve. The results are shown in table 4.
Estimation of Sitagliptine from Tablet.Marketed preparation of SPM selected for the purpose of analysis. Twenty tablets were accurately weighed and powdered quantity equivalent to 100 mg of SPM was transferred in 100 ml volumetric flask and sonicated for 30 min. Then the volume was made upto the mark with methanol and the solution was filtered using Whatman filter paper no. 42 to obtain sample stock solution. 0.8 ml of filtrate was further diluted to 10 ml with same solvent and absorbance of sample was measured against blank. The amount of SPM was calculated from the calibration curve. The results of assay are shown in table 3.
As shown in fig. 1, SPM showed wavelength maxima at 267 nm in methanol. As shown in fig. 2,3 and table 1, the calibration curve was found to be linear in the range of 20-60 μg/ ml with regression equation of y = 0.010X -0.072; (r2 = 0.991) which clearly indicates linearity of developed method. % Recoveries for SPM was found to be satisfied i.e. 99.62 to 100.48% as shown in table 2; clearly indicate that the developed method is accurate. Results of intra-day and inter-day precision is expressed in % RSD and found to be 0.330 and 0.280 respectively. As, % RSD is within the allowable limit of ≤ 2%. It clearly indicates that the developed method is precise. Assay result is in good agreements with the label claim. Hence, the proposed method can be successfully used for its analysis and quality control of marketed solid dosage preparation with good linearity, accuracy and precision.
From the above results it can be concluded that, the developed UV spectrophotometric method is simple, rapid, accurate, precise, specific and economical. Hence, this method can be applied for quantitative analysis of Sitagliptine in bulk and pharmaceutical formulation like tablet dosage form.
The authors are thankful to MSD Pharmaceutical private Ltd. Maharastra, India for providing gift sample of SPM. The authors are very thankful to Principal and Management of Alwar Pharmacy College for providing necessary facilities to carry out research work.