title: Electrospray ionization mass spectrometry as a valuable tool in the characterization of novel primaquine peptidomimetic derivatives.
abstract: Novel primaquine-derived antimalarials have been extensively characterized by electrospray ionization-ion trap mass spectrometry (ESI-MS). Experiments by in-source collision-induced dissociation (CID) in the nozzle- skimmer region (NSR) or by tandem-MS are shown to be most valuable tools for the physicochemical characterization of these 8-aminoquinolinic drugs that also bear the biologically relevant imidazolidin-4-one scaffold. It was possible to find parallelism between compound stability in the NSR and its reactivity towards hydrolysis at physiological pH and T. Moreover, tandem-MS fragmentation patterns were characteristic for each family, providing a means for structural distinction of isomers and allowing to find interesting correlations between the relative abundance of particular fragments and relevant structure-activity determinants, such as Charton steric parameter, v. In conclusion, this work provides solid grounds to establish ESI-MS as a key tool for the physicochemical characterization of biopharmaceuticals bearing the 8-aminoquinoline and/or the imidazolidin-4-one moieties.
authors.affiliation: Centro de Investigação em Química da Universidade do Porto, Departamento de Química, Faculdade de Ciências, Universidade do Porto, Porto, Portugal.
authors.forename: Nuno
authors.initials: N
authors.lastname: Vale
authors.forename: Joana
authors.initials: J
authors.lastname: Matos
authors.forename: Rui
authors.initials: R
authors.lastname: Moreira
authors.forename: Paula
authors.initials: P
authors.lastname: Gomes
mesh_terms: D000634:Aminoquinolines / Q000032:analysis*; D000962:Antimalarials / Q000032:analysis; D048289:Imidazolidines / Q000032:analysis / Q000737:chemistry; D010455:Peptides / Q000032:analysis* / Q000737:chemistry; D011319:Primaquine / Q000031:analogs & derivatives*; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*; D053719:Tandem Mass Spectrometry / Q000379:methods
chemical_list: D000634:Aminoquinolines; D000962:Antimalarials; D048289:Imidazolidines; D010455:Peptides; D011319:Primaquine; C080436:8-aminoquinoline