Distinguishing authentic and counterfeit banknotes by surface chemical composition determined using electrospray laser desorption ionization mass spectrometry

Yi Ying Kao, Chu Nian Cheng, Sy Chyi Cheng, Hsiu O. Ho, Jentaie Shiea

Research output: Contribution to journalArticle

13 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)1129-1135
Number of pages7
JournalJournal of Mass Spectrometry
Issue number11
Publication statusPublished - Nov 2013



  • ambient mass spectrometry
  • banknote
  • electrospray laser desorption ionization
  • money counterfeiting
  • principal component analysis

ASJC Scopus subject areas

  • Spectroscopy

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