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Type: Artigo de periódico
Title: Direct And Non-destructive Proof Of Authenticity For The 2nd Generation Of Brazilian Real Banknotes Via Easy Ambient Sonic Spray Ionization Mass Spectrometry.
Author: Schmidt, Eduardo Morgado
Franco, Marcos Fernando
Regino, Karen Gomes
Lehmann, Eraldo Luiz
Arruda, Marco Aurélio Zezzi
de Carvalho Rocha, Werickson Fortunato
Borges, Rodrigo
de Souza, Wanderley
Eberlin, Marcos Nogueira
Correa, Deleon Nascimento
Abstract: Using a desorption/ionization technique, easy ambient sonic-spray ionization coupled to mass spectrometry (EASI-MS), documents related to the 2nd generation of Brazilian Real currency (R$) were screened in the positive ion mode for authenticity based on chemical profiles obtained directly from the banknote surface. Characteristic profiles were observed for authentic, seized suspect counterfeit and counterfeited homemade banknotes from inkjet and laserjet printers. The chemicals in the authentic banknotes' surface were detected via a few minor sets of ions, namely from the plasticizers bis(2-ethylhexyl)phthalate (DEHP) and dibutyl phthalate (DBP), most likely related to the official offset printing process, and other common quaternary ammonium cations, presenting a similar chemical profile to 1st-generation R$. The seized suspect counterfeit banknotes, however, displayed abundant diagnostic ions in the m/z 400-800 range due to the presence of oligomers. High-accuracy FT-ICR MS analysis enabled molecular formula assignment for each ion. The ions were separated by 44 m/z, which enabled their characterization as Surfynol® 4XX (S4XX, XX=40, 65, and 85), wherein increasing XX values indicate increasing amounts of ethoxylation on a backbone of 2,4,7,9-tetramethyl-5-decyne-4,7-diol (Surfynol® 104). Sodiated triethylene glycol monobutyl ether (TBG) of m/z 229 (C10H22O4Na) was also identified in the seized counterfeit banknotes via EASI(+) FT-ICR MS. Surfynol® and TBG are constituents of inks used for inkjet printing.
Subject: Ambient Mass Spectrometry
Easy Ambient Sonic-spray Ionization Mass Spectrometry
Forensic Science
Questioned Documents
Citation: Science & Justice : Journal Of The Forensic Science Society. v. 54, n. 6, p. 459-64, 2014-Dec.
Rights: fechado
Identifier DOI: 10.1016/j.scijus.2014.08.001
Date Issue: 2014
Appears in Collections:Unicamp - Artigos e Outros Documentos

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