title: Identification and characterization of a photolytic degradation product of telmisartan using LC-MS/TOF, LC-MSn, LC-NMR and on-line H/D exchange mass studies.
abstract: Telmisartan, an anti-hypertensive drug, was subjected to stress studies under ICH prescribed conditions of hydrolysis (acidic, neutral and basic), photolysis, oxidation and thermal stress. The drug showed labiality under only photo-acidic condition by forming a single degradation product. HPLC separation of the drug and the degradation product was achieved on C-8 column using gradient method. To characterize the product, a complete mass fragmentation pathway of the drug was initially established. Subsequently, the degradation product peak was subjected to LC-MS/TOF and on-line H/D exchange mass studies. Based on these studies, a tentative structure was assigned to the product as 3-((1,7'-dimethyl-2'-propyl-1H,3'H-2,5'-bibenzo[d]imidazol-3'-yl)methyl)-6H-benzo[c]chromen-6-one, which was verified through (1)H LC-NMR experiments.
authors.affiliation: Department of Pharmaceutical Analysis, National Institute of Pharmaceutical Education and Research NIPER, Sector 67, SAS Nagar 160 062, Punjab, India.
authors.forename: Ravi P
authors.initials: RP
authors.lastname: Shah
authors.forename: Saranjit
authors.initials: S
authors.lastname: Singh
mesh_terms: D047228:Angiotensin II Type 1 Receptor Blockers / Q000737:chemistry*; D001562:Benzimidazoles / Q000737:chemistry*; D001565:Benzoates / Q000737:chemistry*; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D003903:Deuterium; D004355:Drug Stability; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D013058:Mass Spectrometry / Q000379:methods*; D010782:Photolysis; D000077333:Telmisartan
chemical_list: D047228:Angiotensin II Type 1 Receptor Blockers; D001562:Benzimidazoles; D001565:Benzoates; D003903:Deuterium; D000077333:Telmisartan