Forensic determination of crossing lines involving stamp and pen inks by mass spectrometry imaging

Autor(es)

Rodrigues de Morais, Damila ^[1] ; Campelo, Jacqueline de Morais ^[2] ; Razzo, Daniel ^[1] ; Eberlin, Marcos Nogueira ^{[1, 3]} ; Costa, Jose Luiz ^[4] ; Santos, Jandyson Machado ^{[1, 2]}

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, UNICAMP, Inst Chem, BR-13083970 Campinas, SP - Brazil

^[2] Univ Fed Rural Pernambuco, UFRPE, Chem Dept, BR-52171900 Recife, PE - Brazil

^[3] Univ Prebiteriana Mackenzie, Sch Engn, BR-01302907 Sao Paulo, SP - Brazil

^[4] Univ Estadual Campinas, UNICAMP, Fac Pharmaceut Sci, BR-13083970 Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: ANALYTICAL METHODS; v. 12, n. 7, p. 951-958, FEB 21 2020.
• Citações Web of Science: 0

Resumo

One of the most challenging tasks in forensic cases is to identify the intersection sequence of lines and inks in questionable documents, mainly in those involving significant financial values such as insurance claims, wills and contracts. Optical examination using microscopy images has been commonly used, but this morphological examination presents severe limitations that can lead to false conclusions. Herein, we show that mass spectrometry imaging (MSI) using easy ambient sonic-spray ionization (EASI) can be used to accurately identify the sequence of lines at intersecting points between stamp and pen inks. First, we used proof of concept cases and ion images, and extracted ion chronograms and EASI-MS profiles to evaluate how they could identify the intersection sequences. EASI-MSI was then used to distinguish the sequence of intersecting lines in two cases of simulated contract documents in which a signature made from pen ink was placed under or above the stamp ink. We demonstrate that EASI-MSI provided a clear indication of the actual sequence, showing that it functions as an efficient and rather unequivocal analytical tool in the examination of crossing ink lines when stamping is involved. (AU)

• Processo FAPESP: 18/00432-1 - A Toxicologia das Novas Substâncias Psicoativas (NSP): epidemiologia do consumo através da análise de amostras de cabelo e fluido oral
• Beneficiário: José Luiz da Costa
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 15/10650-8 - Estudo da estabilidade de fármacos, drogas de abuso e praguicidas em amostras de sangue seco em papel, e sua aplicação na toxicologia forense
• Beneficiário: José Luiz da Costa
• Modalidade de apoio: Auxílio à Pesquisa - Regular