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Applications of electrospray laser desorption ionization mass spectrometry for document examination
Author(s) -
Cheng SyChyi,
Lin YuShan,
Huang MingZong,
Shiea Jentaie
Publication year - 2009
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/rcm.4378
Subject(s) - chemistry , extractive electrospray ionization , mass spectrometry , desorption electrospray ionization , ambient ionization , matrix assisted laser desorption electrospray ionization , desorption , analytical chemistry (journal) , electrospray , ionization , electrospray ionization , thermal desorption , chromatography , molecule , solvent , sample preparation in mass spectrometry , ion , chemical ionization , thermal ionization mass spectrometry , organic chemistry , adsorption
We have employed electrospray laser desorption ionization mass spectrometry (ELDI‐MS) to rapidly characterize certain classes of compounds – the inks within the characters made by inks and inkjet printer on regular paper and the chemical compounds within thermal papers. This ELDI‐MS approach allowed the ink and paper samples to be distinguished in terms of their chemical compositions. Sample pretreatment was unnecessary and the documents were practically undamaged after examination. The ink chemicals on the documents were desorbed through laser irradiation (sampling spot area: <100 µm 2 ); the desorbed molecules then entered an electrospray plume – prepared from an acidic methanol/water solution (50%) – where they became ionized through fusion or ion‐molecule reactions with the charged solvent species and droplets in the plume. Copyright © 2009 John Wiley & Sons, Ltd.