title: Analyzing Brazilian vehicle documents for authenticity by easy ambient sonic-spray ionization mass spectrometry.
abstract: Using desorption/ionization techniques such as easy ambient sonic-spray ionization mass spectrometry (EASI-MS), it is possible to analyze documents of Brazilian vehicles for authenticity, providing a chemical profile directly from the surface of each document. A method for the detection of counterfeit documents is described, and the falsification procedure is elucidated. Forty authentic and counterfeit documents were analyzed by both positive and negative ion modes, EASI(±)-MS. EASI(+)-MS results identified the presence of (bis(2-ethylhexyl)phthalate plasticizer and of dihexadecyldimethylammonium biocide in both types of documents. For EASI(-)-MS results, the 4-octyloxybenzoic acid additive ([M + H](+): m/z 249) is present only in counterfeit documents. It was also found that counterfeit vehicle documents are produced via Laserjet printers. Desorption/ionization techniques, such as EASI-MS, offer therefore, an intelligent way to characterize the counterfeiting method.
authors.affiliation: Thomson Mass Spectrometry Laboratory, Institute of Chemistry, Campinas, SP, Brazil. wandersonromao@gmail.com
authors.forename: Wanderson
authors.initials: W
authors.lastname: Romão
authors.forename: Boniek G
authors.initials: BG
authors.lastname: Vaz
authors.forename: Priscila M
authors.initials: PM
authors.lastname: Lalli
authors.forename: Maria Izabel M S
authors.initials: MI
authors.lastname: Bueno
authors.forename: Deleon N
authors.initials: DN
authors.lastname: Correa
authors.forename: Virgínia L C N
authors.initials: VL
authors.lastname: Telles
authors.forename: Eustáquio V R
authors.initials: EV
authors.lastname: de Castro
authors.forename: Marcos N
authors.initials: MN
authors.lastname: Eberlin