title: Chemical and analytical characterization of related organic impurities in drugs.
abstract: A system is proposed for the classification of related organic impurities in drugs and drug products including among others (separated and non-separated) intermediates, various kinds of by-products, among them products of different side reactions, epimeric/diastereomeric, enantiomeric impurities, impurities in natural products, and finally degradation products. Examples are taken mainly from the author's own experience and from among the named impurities in the European Pharmacopoeia with focus on impurities in hydrocortisone, prednisolone, enalapril maleate, lisinopril, ethynodiol diacetate, pipecuronium bromide, cimetidine, and ethynylsteroids. The methodological aspects of impurity profiling from the detection to the identification/structure elucidation and quantitative determination of impurities are briefly summarized.
authors.affiliation: Chemical Works of Gedeon Richter Ltd., P.O.B. 27, 1475, Budapest, Hungary. s.gorog@richter.hu
authors.forename: Sándor
authors.initials: S
authors.lastname: Görög
mesh_terms: D002927:Cimetidine / Q000737:chemistry / Q000302:isolation & purification; D004340:Drug Contamination; D004656:Enalapril / Q000737:chemistry / Q000302:isolation & purification; D005040:Ethynodiol Diacetate / Q000737:chemistry / Q000302:isolation & purification; D006854:Hydrocortisone / Q000737:chemistry / Q000302:isolation & purification; D017706:Lisinopril / Q000737:chemistry / Q000302:isolation & purification; D009640:Norethindrone / Q000737:chemistry / Q000302:isolation & purification; D009644:Norgestrel / Q000737:chemistry / Q000302:isolation & purification; D009930:Organic Chemicals / Q000032:analysis*; D004364:Pharmaceutical Preparations / Q000737:chemistry / Q000302:isolation & purification*; D017300:Pipecuronium / Q000737:chemistry / Q000302:isolation & purification; D011239:Prednisolone / Q000737:chemistry / Q000302:isolation & purification
chemical_list: D009930:Organic Chemicals; D004364:Pharmaceutical Preparations; D017300:Pipecuronium; D009644:Norgestrel; D005040:Ethynodiol Diacetate; D004656:Enalapril; D002927:Cimetidine; D011239:Prednisolone; D017706:Lisinopril; D009640:Norethindrone; D006854:Hydrocortisone