title: Electron ionisation mass spectral study of 2-(2-carboxy-4, 5-dimethoxyphenyl)-6,7-dimethoxyisoquinolinium inner salt.
abstract: The electron ionization mass spectrum of 2-(2-carboxy-4,5-dimethoxyphenyl)-6,7-dimethoxyisoquinolinium inner salt 1 is discussed and general fragmentation routes of its molecular ion are proposed. Comparison of the data obtained for 1 with the EI-MS data of metameric protopine alkaloids (allocryptopine, argemexicaine A, argemexicaine B) and the pseudobenzyloisoquinoline alkaloid taxilamine allows a differentiation between these metamers. The data will be useful for the identification of metabolites of alkaloids of these types in biological matrices.
authors.affiliation: Faculty of Chemistry, Adam Mickiewicz University, Poznań, Poland.
authors.forename: E
authors.initials: E
authors.lastname: Wyrzykiewicz
authors.forename: A
authors.initials: A
authors.lastname: Czyrski
authors.forename: T
authors.initials: T
authors.lastname: Hermann
authors.forename: U
authors.initials: U
authors.lastname: Girreser
mesh_terms: D000470:Alkaloids / Q000032:analysis*; D007536:Isomerism; D007546:Isoquinolines / Q000032:analysis*; D012996:Solutions; D021241:Spectrometry, Mass, Electrospray Ionization
chemical_list: C547425:2-(2-carboxy-4,5-dimethoxyphenyl)-6,7-dimethoxyisoquinolinium inner salt; D000470:Alkaloids; D007546:Isoquinolines; D012996:Solutions