Forensic analysis of inks by imaging desorption electrospray ionization (DESI) mass spectrometry
- 30 March 2007
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in The Analyst
- Vol. 132 (5) , 461-467
- https://doi.org/10.1039/b700236j
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.Keywords
This publication has 44 references indexed in Scilit:
- Forensic classification of ballpoint pen inks using high performance liquid chromatography and infrared spectroscopy with principal components analysis and linear discriminant analysisVibrational Spectroscopy, 2006
- Dynamic of the ageing of ballpoint pen inks: quantification of phenoxyethanol by GC-MSScience & Justice, 2004
- Differentiation of Black Gel Inks Using Optical and Chemical TechniquesJournal of Forensic Sciences, 2004
- Development and Validation of a Gradient‐HPLC‐PDAD Method for the Identification of Ballpoint Pen Ink Components: Study of Their Decomposition on Aging for Forensic Science ApplicationsJournal of Liquid Chromatography & Related Technologies, 2004
- Ballpoint Pen Inks: Characterization by Positive and Negative Ion-Electrospray Ionization Mass Spectrometry for the Forensic Examination of Writing InksJournal of Forensic Sciences, 2002
- Evaluation of Principal Components Analysis with High-Performance Liquid Chromatography and Photodiode Array Detection for the Forensic Differentiation of Ballpoint Pen InksJournal of Forensic Sciences, 2001
- HPLC Analysis of Ballpoint Pen Inks Stored at Different Light ConditionsJournal of Forensic Sciences, 2001
- Analysis of Ballpoint Pen Inks by Field Desorption Mass SpectrometryJournal of Forensic Sciences, 1999
- Separation and Comparison of Fountain Pen Inks by Capillary Zone ElectrophoresisJournal of Forensic Sciences, 1997
- Determination of the age of ballpoint pen ink by gas and densitometric thin-layer chromatographyJournal of Chromatography A, 1994