Comparative Liquid Chromatographic Study for Concurrent Determination of Canagliflozin and Metformin in Combined Tablets

الملخص EN

New HPLC-UV method (method A), for simultaneous determination of metformin (MET) and canagliflozin (CANA), was developed and compared to another novel UPLC-UV method (method B) in their tablet combination.

Concerning method A, isocratic separation was done by C18 column (100 mm × 2.1 mm, 3 μm) using methanol and 0.03 M phosphate buffer (75:25, v/v) at pH 3.2 as a mobile phase.

Meanwhile, chromatographic separation in method B was achieved via Hypersil® gold (50 mm × 2.1 mm, 1.9 μm).

Mobile phase was methanol and 0.03 M phosphate buffer at ratio of 80:20 v/v.

In both, detection was done at wavelength of 240 nm.

Method A showed satisfactory linearity results over 1–50 μg·mL−1 and 0.5–100 μg·mL−1, while method B linearity was at 0.1–50 μg·mL−1 and 0.25–100 μg·mL−1 for CANA and MET, respectively.

In terms of accuracy and precision, method A accuracy was 99.81±0.73 and 99.37±0.54, while method B gave accuracy of 99.47±1.03 and 99.73±0.89 for CANA and MET, respectively.

For precision, the % RSD was found to be less than 2% for three concentrations analyzed three times.

The two methods are convenient for quality laboratories, yet the UPLC method offered the advantage of shorter run times and higher sensitivity.