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Ballpoint pen inks: characterization by positive and negative ion-electrospray ionization mass spectrometry for the forensic examination of writing inks.
J Forensic Sci. 2002 Nov; 47(6):1238-47.JF

Abstract

A method based on profiling of dye components by electrospray ionization mass spectrometry (ESI/MS) is described for the characterization of ballpoint pen inks. The method involves benzyl alcohol (30 microL) extraction of ink from paper. The extracts of ink lines 1 and 5 mm in length are used for direct ESI/MS analysis in positive and negative modes, respectively. The instrumental analysis takes 3 min. Basic and acid dyes in the inks are detected in the positive and negative modes, respectively, with each dye yielding one or two characteristic ion peaks. The mass spectrum, which is mainly a compositional signature of the dyes in the ink, was not affected by the type of paper from which the ink was extracted, or by natural ageing of the ink on document in the absence of light. However, exposure to fluorescent illumination caused dealkylation of polyalkylated basic dyes and resulted in changes in the homologous distribution of the dyes. In this study, a total of 44 blue inks, 23 black inks, and 10 red inks have been analyzed, and the mass spectra were used to establish a searchable library. ESI/MS analysis provides a simple and fast way to compare ink specimens and in combination with on-line library search permits rapid screening of inks for forensic document investigations.

Authors+Show Affiliations

Laboratory and Scientific Services Directorate, Canada Customs and Revenue Agency, Ottawa, Ontario. Rachel.Lab.Ng@ccra-adrc.gc.caNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

12455644

Citation

Ng, Lay-Keow, et al. "Ballpoint Pen Inks: Characterization By Positive and Negative Ion-electrospray Ionization Mass Spectrometry for the Forensic Examination of Writing Inks." Journal of Forensic Sciences, vol. 47, no. 6, 2002, pp. 1238-47.
Ng LK, Lafontaine P, Brazeau L. Ballpoint pen inks: characterization by positive and negative ion-electrospray ionization mass spectrometry for the forensic examination of writing inks. J Forensic Sci. 2002;47(6):1238-47.
Ng, L. K., Lafontaine, P., & Brazeau, L. (2002). Ballpoint pen inks: characterization by positive and negative ion-electrospray ionization mass spectrometry for the forensic examination of writing inks. Journal of Forensic Sciences, 47(6), 1238-47.
Ng LK, Lafontaine P, Brazeau L. Ballpoint Pen Inks: Characterization By Positive and Negative Ion-electrospray Ionization Mass Spectrometry for the Forensic Examination of Writing Inks. J Forensic Sci. 2002;47(6):1238-47. PubMed PMID: 12455644.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Ballpoint pen inks: characterization by positive and negative ion-electrospray ionization mass spectrometry for the forensic examination of writing inks. AU - Ng,Lay-Keow, AU - Lafontaine,Pierre, AU - Brazeau,Luc, PY - 2002/11/29/pubmed PY - 2002/11/29/medline PY - 2002/11/29/entrez SP - 1238 EP - 47 JF - Journal of forensic sciences JO - J Forensic Sci VL - 47 IS - 6 N2 - A method based on profiling of dye components by electrospray ionization mass spectrometry (ESI/MS) is described for the characterization of ballpoint pen inks. The method involves benzyl alcohol (30 microL) extraction of ink from paper. The extracts of ink lines 1 and 5 mm in length are used for direct ESI/MS analysis in positive and negative modes, respectively. The instrumental analysis takes 3 min. Basic and acid dyes in the inks are detected in the positive and negative modes, respectively, with each dye yielding one or two characteristic ion peaks. The mass spectrum, which is mainly a compositional signature of the dyes in the ink, was not affected by the type of paper from which the ink was extracted, or by natural ageing of the ink on document in the absence of light. However, exposure to fluorescent illumination caused dealkylation of polyalkylated basic dyes and resulted in changes in the homologous distribution of the dyes. In this study, a total of 44 blue inks, 23 black inks, and 10 red inks have been analyzed, and the mass spectra were used to establish a searchable library. ESI/MS analysis provides a simple and fast way to compare ink specimens and in combination with on-line library search permits rapid screening of inks for forensic document investigations. SN - 0022-1198 UR - https://www.unboundmedicine.com/medline/citation/12455644/Ballpoint_pen_inks:_characterization_by_positive_and_negative_ion_electrospray_ionization_mass_spectrometry_for_the_forensic_examination_of_writing_inks_ DB - PRIME DP - Unbound Medicine ER -
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