Smart spectrophotometric methods for the simultaneous determination of newly co-formulated hypoglycemic drugs in...

Achieving good glycemic control in patients with type II diabetes mellitus is essential for preventing both microvascular and macrovascular complications. Combination therapy represents the principle strategy for successful long term control of type II diabetes mellitus with minimal complications. Two sensitive, precise and non-destructive spectroscopic methods were developed for the simultaneous estimation of two new co-formulated hypoglycemic drugs; canagliflozin/metformin (CAG/MEF) and empagliflozin/linagliptin (EMG/LIG) in tablets with no need of previous separation. The first method was amplitude modulation (a normalized spectra-based UV spectrophotometric method) for the analysis of (CAG/MEF) binary mixture. The amplitude of the constant at the plateau region at (264-310 nm) on the ratio spectrum was measured and used for the determination of CAG concentration in the mixture. On the other hand, MEF was estimated by subtracting the previously obtained amplitude from the total amplitude of CAG and MEF at the isosbestic point (λ_iso) at 250 nm. The second method was chemometric-assisted FTIR spectrophotometric method for the determination of (EMG/LIG) binary mixture. (EMG/LIG) mixture in chloroform was analyzed using FTIR in the region 4000-400 cm^-1. The spectral region 3900-2900 cm^-1 was selected for (EMG/LIG) determination using principal component regression and partial least squares chemometric methods. The methods were validated according to ICH guidelines. The studied drugs were successfully determined in tablets applying the developed methods. Validation parameters were in agreement with acceptance limits, ensuring methods accuracy and selectivity. Besides, no significant difference was obtained by statistically comparing the obtained results with the reported one.