A statistical methodology for the comparison of blue gel pen inks analyzed by laser desorption/ionization mass spectrometry

Détails

Ressource 1Télécharger: BIB_8E07357CF840.P001.pdf (346.79 [Ko])
Etat: Serval
Version: de l'auteur
ID Serval
serval:BIB_8E07357CF840
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
A statistical methodology for the comparison of blue gel pen inks analyzed by laser desorption/ionization mass spectrometry
Périodique
Science & Justice
Auteur(s)
Weyermann C., Bucher L., Majcherczyk P.
ISSN
1355-0306
Statut éditorial
Publié
Date de publication
2011
Peer-reviewed
Oui
Volume
51
Numéro
3
Pages
122-130
Langue
anglais
Notes
http://dx.doi.org/10.1016/j.scijus.2010.10.008
Résumé
A statistical methodology for the objective comparison of LDI-MS mass spectra of blue gel pen inks was evaluated. Thirty-three blue gel pen inks previously studied by RAMAN were analyzed directly on the paper using both positive and negative mode. The obtained mass spectra were first compared using relative areas of selected peaks using the Pearson correlation coefficient and the Euclidean distance. Intra-variability among results from one ink and inter-variability between results from different inks were compared in order to choose a differentiation threshold minimizing the rate of false negative (i.e. avoiding false differentiation of the inks). This yielded a discriminating power of up to 77% for analysis made in the negative mode. The whole mass spectra were then compared using the same methodology, allowing for a better DP in the negative mode of 92% using the Pearson correlation on standardized data. The positive mode results generally yielded a lower differential power (DP) than the negative mode due to a higher intra-variability compared to the inter-variability in the mass spectra of the ink samples.
Mots-clé
Questioned document, Gel pens, Mass spectrometry, Laser desorption/ionization, Discriminating power, Pearson correlation coefficient
Web of science
Open Access
Oui
Création de la notice
08/12/2010 12:12
Dernière modification de la notice
08/05/2019 21:51
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