Journal
FORENSIC CHEMISTRY
Volume 2, Issue -, Pages 86-92Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.forc.2016.10.007
Keywords
Ink analysis; Nanomanipulation; Nanospray ionization mass spectrometry; Matrix-assisted laser desorption ionization; Direct analyte-probed nanoextraction; Silver nanoparticles
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Funding
- National Institute of Justice Grant [NIJ-2013-3361]
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Matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS) has been coupled to direct analyte-probed nanoextraction (DAPNe) through use of nanomanipulation for the analysis of ink chemistry on documents. DAPNe is first used to extract ink from the document and then deposits the sample on the MALDI plate. Through this method, cutting the document for MALDI-MS analysis is avoided. DAPNe extracts ink from documents with minimal to no visible destruction. Specific dyes and binding agents in the extracted ink are monitored with mass spectrometry. Different matrices, 1, 5-diaminonapthalene (DAN), 2, 5-dihydroxybenzoic acid (DHB), and silver nanoparticles, were tested to compare intensity enhancement of the mass spectra signals. The advantages of using MALDI-MS coupled to DAPNe are shown by characterizing Crystal Violet, Basic Yellow 2, Rhodamine B, and polyethylene glycol from red and blue pens, black pen, and a black inkjet printer cartridge. (C) 2016 Elsevier B.V. All rights reserved.
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