Monitoring compositional changes of the lipid fraction of fingermark residues deposited on paper during storage

• Published in: Forensic chemistry Vol. 2; pp. 29 - 36
• Main Authors: Frick, A.A., Chidlow, G., Goodpaster, J.V., Lewis, S.W., van Bronswijk, W.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-11-2016
• Subjects: Degradation; Gas chromatography–mass spectrometry; Latent fingermarks; Lipids; Principal component analysis; Degradation; Latent fingermarks; Lipids; Gas chromatography–mass spectrometry; Principal component analysis
• ISSN: 2468-1709; 2468-1709
• DOI: 10.1016/j.forc.2016.09.001

[Display omitted]
•GC–MS used to monitor relative changes in latent fingermarks over 28days.•Changes in composition attributed principally to squalene photodegradation.•Significant inter-donor variation of rates and nature of degradation processes.•Marked impact of storage conditions on compositional changes in latent fingermarks.
Characterising the changes in fingermark composition as a function of time is of great value for improving fingermark detection capabilities by understanding the processes and circumstances under which target compounds become degraded. In this study, gas chromatography-mass spectrometry was used to monitor relative changes in the lipids from latent fingermarks over 28days. Principal component analysis of the relative composition of 15 lipids in fingermarks showed that fingermark age was a significant contributor to the variability observed in the data, but that inter-donor variability was also significant. This was attributed principally to changes in the relative amounts of squalene, which rapidly decreased in the fingermarks. It was also observed, however, that most fingermarks exhibited relatively small changes in composition during the first seven days, followed by more rapid changes up to 28days. Significant inter-donor variation of both initial fingermark composition and the rates and nature of loss processes was observed, which was reflected in the relative projection of samples from different donors. Finally, samples stored with no exposure to light or airflow for 28days were projected significantly closer to the samples analysed on the day of deposition than those exposed to light, due to the reduced photodegradation rate of squalene.