Figure 1From: Stability profiling of anti-malarial drug piperaquine phosphate and impurities by HPLC-UV, TOF-MS, ESI-MS and NMRUV chromatogram of piperaquine crude sample. The imp-1, 2, 4 (1, 2, 4) were the starting material. The imp-3, 5, 11, 12 (3, 5, 11, 12) were the by-product in the synthetic reaction of piperaquine phosphate (P). The imp-6, 7, 8, 10 (6, 7, 8, 10) were the oxidation products and the imp-9 (9) was the degradation product of piperaquine phosphate.Back to article page