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J Pharm Biomed Anal. 2016 Sep 5;128:18-27. doi: 10.1016/j.jpba.2016.04.041. Epub 2016 May 10.

Identification, characterization and HPLC quantification of process-related impurities in Trelagliptin succinate bulk drug: Six identified as new compounds.

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School of Pharmaceutical Sciences, Nanjing Tech. University, Nanjing 210009, PR China.
College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech. University, Nanjing 210009, PR China.
School of Pharmaceutical Sciences, Nanjing Tech. University, Nanjing 210009, PR China. Electronic address:


A sensitive, selective and stability indicating reversed-phase LC method was developed for the determination of process related impurities of Trelagliptin succinate in bulk drug. Six impurities were identified by LC-MS. Further, their structures were characterized and confirmed utilizing LC-MS/MS, IR and NMR spectral data. The most probable mechanisms for the formation of these impurities were also discussed. To the best of our knowledge, six structures among these impurities are new compounds and have not been reported previously. The superior separation was achieved on an InertSustain C18 (250mm×4.6mm, 5μm) column in a gradient mixture of acetonitrile and 20mmol potassium dihydrogen phosphate with 0.25% triethylamine (pH adjusted to 3.5 with phosphate acid). The method was validated as per regulatory guidelines to demonstrate system suitability, specificity, sensitivity, linearity, robustness, and stability.


LC–MS; NMR; Process related impurity; Quantification; Structural elucidation; Trelagliptin succinate

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