Identification,synthesis and characterization of an unknown process related impurity in eslicarbazepine acetate active pharmaceutical ingredient by LC/ESI–IT/MS, 1H, 13C and 1H–1H COSY NMR |
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Institution: | 1. Analytical Research Department, Jubilant Life Sciences Ltd., R&D Centre, C-26, Sector-59, Noida, Uttar Pradesh 201301, India;2. Chemical Research Department, Jubilant Life Sciences Ltd., R&D Centre, C-26, Sector-59, Noida, Uttar Pradesh 201301, India |
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Abstract: | A new impurity was detected during high performance liquid chromatographic (HPLC) analysis of eslicarbazepine acetate active pharmaceutical ingredient. The structure of unknown impurity was postulated based on liquid chromatography mass spectrometry using electrospray ionization and ion trap analyzer (LC/ESI–IT/MS) analysis. Proposed structure of impurity was unambiguously confirmed by synthesis followed by characterization using 1H, 13C nuclear magnetic resonance spectrometry (NMR), 1H–1H correlation spectroscopy (COSY) and infrared spectroscopy (IR). Based on the spectroscopic and spectrometric data, unknown impurity was characterized as 5-carbamoyl-10,11-dihydro-5H-dibenzob,f]azepin-10-yl propionate. |
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Keywords: | Eslicarbazepine acetate Characterization LC/ESI–IT/MS NMR Impurity |
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