Development and validation of stability-indicating RP-HPLC method for the simultaneous determination of ertugliflozin pidolate and metformin hydrochloride in bulk and tablets

Background: In the present study, an improved simple, specific, rapid, sensitive, precise, accurate and stability-indicating RP-HPLC method for the simultaneous estimation of ertugliflozin pidolate and metformin hydrochloride in bulk and tablets was developed and validated. The separation of ertugliflozin pidolate and metformin HCl was achieved isocratically on Kromasil C18 column (150 mm x 4.6 mm, 5 mu m) using 0.1%ortho-phosphoric acid buffer (pH 2.7):acetonitrile (65:35%v/v) as mobile phase, pumped at a flow rate of 1 ml/min and column temperature of 30 +/- 2 degrees C. HPLC grade water:ACN (1:1) was used as diluent. About 10 mu l of standard solution of the drugs was injected, and the eluted analytes were detected at 224 nm. Results: Metformin HCl was eluted at 2.170 min and ertugliflozin pidolate at 2.929 min with a run time of 5.0 min. Linearity of the developed method was observed in the concentration range of 0.9375-5.625 mu g/ml for ertugliflozin pidolate and 62.5-375 mu g/ml for metformin HCl with a correlation coefficient of 0.999 for both the drugs. LOD for ertugliflozin pidolate and metformin HCl were 0.025 mu g/ml and 0.87 mu g/ml respectively. LOQ for ertugliflozin pidolate and metformin HCl were 0.076 mu g/ml and 2.63 mu g/ml. Conclusion: The developed RP-HPLC method for the simultaneous estimation of ertugliflozin pidolate and metformin HCl in bulk and tablets was simple, rapid, sensitive, accurate, precise, linear, and stability indicating. Hence, the developed method could be used for the routine quality control of the drugs in bulk and tablets.