Isolation and characterization of a novel acid degradation impurity of Amlodipine Besylate using Q-TOF, NMR, IR and single crystal X-ray.

Autor: Rapolu R; Analytical Research and Development, United States Pharmacopeial Convention - India (P) Ltd., Plot No. D6 & D8, IKP, Genome Valley, Shameerpet, Hyderabad 500078, India., Raju ChK; Analytical Research and Development, United States Pharmacopeial Convention - India (P) Ltd., Plot No. D6 & D8, IKP, Genome Valley, Shameerpet, Hyderabad 500078, India., Srinivas K; Analytical Research and Development, United States Pharmacopeial Convention - India (P) Ltd., Plot No. D6 & D8, IKP, Genome Valley, Shameerpet, Hyderabad 500078, India., Awasthi A; Analytical Research and Development, United States Pharmacopeial Convention - India (P) Ltd., Plot No. D6 & D8, IKP, Genome Valley, Shameerpet, Hyderabad 500078, India. Electronic address: axa@usp.org., Navalgund SG; Analytical Research and Development, United States Pharmacopeial Convention - India (P) Ltd., Plot No. D6 & D8, IKP, Genome Valley, Shameerpet, Hyderabad 500078, India., Surendranath KV; Analytical Research and Development, United States Pharmacopeial Convention - India (P) Ltd., Plot No. D6 & D8, IKP, Genome Valley, Shameerpet, Hyderabad 500078, India.
Jazyk: angličtina
Zdroj: Journal of pharmaceutical and biomedical analysis [J Pharm Biomed Anal] 2014 Oct; Vol. 99, pp. 59-66. Date of Electronic Publication: 2014 Jul 15.
DOI: 10.1016/j.jpba.2014.07.006
Abstrakt: Forced degradation of Amlodipine Besylate (AMD) in acidic condition gave rise to a potential unknown impurity. This unknown acid degradation product (ADP) was evaluated using a new-reverse-phase high performance liquid chromatography (HPLC), where it was eluted at 1.24 relative retention time to AMD peak. ADP was isolated using preparative HPLC from degradation mixture. Later, structure of ADP was elucidated using high resolution MS, multidimensional NMR and FTIR spectroscopic techniques, and characterized as ethyl-6-(2-chlorophenyl)-8-methyl-3,4,6,7-tetrahydro-2H-benzo[b][1,4]oxazine-5-carboxylate. The presence of ADP recemic mixture was confirmed by polarimeter and chiral HPLC. Given the complexity associated with ADP generation, single crystal X-ray crystallography technique was used to confirm proposed structure. In addition, reaction mechanism was postulated and confirmed using computational chemistry. To our knowledge, it is a novel impurity and not reported elsewhere.
(Copyright © 2014 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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