Fig. 2

UPLC chromatogram of a mixture of a Saxagliptin (10 μg mL^–1), b metformin (10 μg mL^–1), and c melamine (1 μg mL^–1) using a methanol–sodium lauryl sulfate (SDS) 0.01 m (70:30, by volume), pH = 3.3with H₃PO₄) as the mobile phase