title: Application of CE-MS to examination of black inkjet printing inks for forensic purposes.
abstract: The potential of capillary electrophoresis coupled to mass spectrometry with electrospray ion source and time of flight analyser (CE-ESI-TOF-MS) in the analysis of inkjet inks was investigated. The developed and validated method allowed reliable and repeatable analysis of black inkjet inks extracted from printouts. Over a dozen inkjet printouts printed on various printer models from different manufacturers were analysed under selected conditions to determine the variation of chemical composition of inks between different brands and types. It was ascertained that the developed method is capable of revealing qualitative differences between ink samples. For most of the investigated inks, the studies showed the presence of a characteristic mass spectrum originating from the surfactant or polymer. The mass distribution of the additive is distinctive for some inkjet ink producers, and allows for group identification of inks. The results showed the strength of the CE-ESI-TOF-MS method as an effective technique for forensic purposes, requiring a small amount of inkjet ink samples and giving analytical information that is useful in the identification of compounds.
authors: Jagiellonian University, Faculty of Chemistry, Department of Analytical Chemistry, Laboratory for Forensic Chemistry, 3 Ingardena St., 30-060 Kraków, Poland.
authors: Agnieszka
authors: A
authors: Kula
authors: Jagiellonian University, Faculty of Chemistry, Department of Analytical Chemistry, Laboratory for Forensic Chemistry, 3 Ingardena St., 30-060 Kraków, Poland.
authors: Małgorzata
authors: M
authors: Król
authors: Jagiellonian University, Faculty of Chemistry, Department of Analytical Chemistry, Laboratory for Forensic Chemistry, 3 Ingardena St., 30-060 Kraków, Poland.
authors: Renata
authors: R
authors: Wietecha-Posłuszny
authors: Jagiellonian University, Faculty of Chemistry, Department of Analytical Chemistry, Laboratory for Forensic Chemistry, 3 Ingardena St., 30-060 Kraków, Poland.
authors: Michał
authors: M
authors: Woźniakiewicz
authors: Jagiellonian University, Faculty of Chemistry, Department of Analytical Chemistry, Laboratory for Forensic Chemistry, 3 Ingardena St., 30-060 Kraków, Poland. Electronic address: koscieln@chemia.uj.edu.pl.
authors: Paweł
authors: P
authors: Kościelniak
mesh_terms: D004396:Coloring Agents / Q000032:analysis* / Q000302:isolation & purification; D019075:Electrophoresis, Capillary / Q000379:methods*; D044707:Forensic Sciences / Q000379:methods*; D007281:Ink; D011327:Printing; D015203:Reproducibility of Results; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*
chemical_list: D004396:Coloring Agents
keywords: CE-MS; Forensic science; Ink analysis; Inkjet inks; Questioned document examination