The Development and Validation of Simultaneous Quantitative Analysis Reversed-phase High-performance Liquid Chromatography for Sitagliptin Phosphate Monohydrate and Dapagliflozin Propanediol Monohydrate Fixed-dose Combination Dual-layered Tablet

Background: Sitagliptin phosphate monohydrate-dapagliflozin propanediol hydrate fixeddose combination (FDC) dual-layered tablet is used for type 2 diabetes treatment. Simultaneous quantitative analysis can shorten the analysis time of sitagliptin phosphate monohydrate-dapagliflozin propanediol monohydrate FDC dual-layered tablets and increase their efficiency. Objective: This study aimed to develop the simultaneous quantitative analysis for sitagliptin phosphate monohydrate-dapagliflozin propanediol monohydrate FDC dual-layered tablet, a type 2 diabetes treatment. Methods: Simultaneous quantitative analysis using the rapid and selective reversed-phase highperformance liquid chromatography (RP-HPLC) method was developed and validated using method validation. RP-HPLC analysis was conducted using an ultraviolent absorption spectrophotometer and a Zorbax C18 column (4.6 x 150 mm, 5 μm). The flow rate and injection volume were set to 1.5 mL min^{-1 and 20 μL, respectively. The wavelength was set at 205 nm.} Results: The retention times of sitagliptin phosphate monohydrate and dapagliflozin propanediol monohydrate were 2.28 mins and 10.65 mins, respectively. The relative standard deviations of the system suitability for validation of simultaneous quantitative analysis were 0.03% for sitagliptin phosphate monohydrate and dapagliflozin propanediol monohydrate. The chromatogram confirmed that there was no peak interference between the two main components and between the main component and the excipients. In addition, It revealed a favorable linearity with correlation coefficients of 0.9999 in the concentration range of 20-120% compared to the standard solution. Conclusion: The developed simultaneous quantitative analysis shortened the analysis time and high efficiency of the sitagliptin phosphate monohydrate-dapagliflozin propanediol monohydrate FDC bilayer tablet. The validity of the analytical method was verified through accuracy and precision, detection and quantitation limits, and solution stability tests. In addition, it was thought that it would be helpful in developing an analytical method by referring to the simultaneous quantitative analysis method for developing other FDC dual-layered tablets.