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- Title
Towards Fingermark Dating: A Raman Spectroscopy Proof-of-Concept Study.
- Authors
Andersson, Per Ola; Lejon, Christian; Mikaelsson, Therese; Landström, Lars
- Abstract
Fingermarks have, for a long time, been vital in the forensic community for the identification of individuals, and a possibility to non-destructively date the fingermarks would of course be beneficial. Raman spectroscopy is, herein, evaluated for the purpose of estimating the age of fingermarks deposits. Well-resolved spectra were non-destructively acquired to reveal spectral uniqueness, resembling those of epidermis, and several molecular markers were identified that showed different decay kinetics: carotenoids > squalene > unsaturated fatty acids > proteins. The degradation rates were accelerated, less pronounced for proteins, when samples were stored under ambient light conditions, likely owing to photo-oxidation. It is hypothesized that fibrous proteins are present and that oxidation of amino acid side chains can be observed both through Raman and fluorescence spectroscopy. Clearly, Raman spectroscopy is a useful technique to non-destructively study the aging processes of fingermarks.
- Subjects
RAMAN spectroscopy; FLUORESCENCE spectroscopy; UNSATURATED fatty acids; CAROTENOIDS; BIODEGRADATION
- Publication
ChemistryOpen, 2017, Vol 6, Issue 6, p706
- ISSN
2191-1363
- Publication type
Article
- DOI
10.1002/open.201700129