College of Pharmacy, Taipei Medical University, Taipei, Taiwan; Investigation Bureau, Ministry of Justice, New Taipei, Taiwan.
J Mass Spectrom. 2013 Nov;48(11):1129-35. doi: 10.1002/jms.3263.
Electrospray laser desorption ionization mass spectrometry (ELDI/MS) was used to rapidly distinguish authentic banknotes from counterfeits of the US dollar and the New Taiwan dollar. The banknotes' surfaces were irradiated with a pulsed ultraviolet laser, after which the desorbed ink compounds entered an electrospray plume and formed ions via interactions with charged solvent species. Authentic banknotes were found to differ from their counterfeit equivalents in their surface chemical compositions. The detected chemical compounds included various polymers, plasticizers and inks; these results were comparable with those obtained using solvent extraction followed by electrospray ionization mass spectrometry analysis. Because of the high spatial resolution of the laser beam, ELDI/MS analysis resulted in minimal damage to the banknotes.
电喷雾激光解吸电离质谱（ELDI/MS）被用于快速区分真美元和新台币钞票与假钞。钞票表面被脉冲紫外激光照射，之后解吸的墨迹化合物进入电喷雾云并通过与带电溶剂相互作用形成离子。真钞和假钞在表面化学成分上有所不同。检测到的化学化合物包括各种聚合物、增塑剂和墨水；这些结果与溶剂萃取后再进行电喷雾电离质谱分析的结果相当。由于激光束的高空间分辨率，ELDI/MS 分析对钞票的损伤极小。
