Jump to main content
Jump to site search

Issue 5, 2007
Previous Article Next Article

Forensic analysis of inks by imaging desorption electrospray ionization (DESI) mass spectrometry

Author affiliations

Abstract

Desorption electrospray ionization mass spectrometry (DESI-MS) is employed in the forensic analysis of documents. Blue ballpoint pen inks applied to ordinary writing paper are examined under ambient conditions without any prior sample preparation. When coupled to an automated moving stage, two-dimensional molecular images are generated. Proof-of-principle experiments include characterization of a simulated forged number and examination of older written records. This application of DESI has advantages over extractive techniques in terms of speed and sample preservation. The effects of the desorbing solvent composition, in this case a mixture of methanol and water, and of flow rate, are evaluated. Results suggest that the solubility of the analyte (dyes Basic Blue 7, Basic Violet 3 and Solvent Blue 26) plays an important role in desorption from the paper surface.

Graphical abstract: Forensic analysis of inks by imaging desorption electrospray ionization (DESI) mass spectrometry

Back to tab navigation

Publication details

The article was received on 08 Jan 2007, accepted on 12 Mar 2007 and first published on 30 Mar 2007


Article type: Paper
DOI: 10.1039/B700236J
Citation: Analyst, 2007,132, 461-467
  •   Request permissions

    Forensic analysis of inks by imaging desorption electrospray ionization (DESI) mass spectrometry

    D. R. Ifa, L. M. Gumaelius, L. S. Eberlin, N. E. Manicke and R. G. Cooks, Analyst, 2007, 132, 461
    DOI: 10.1039/B700236J

Search articles by author

Spotlight

Advertisements