Changes in latent fingermark glyceride composition as a function of sample age using UPLC-IMS-QToF-MSE

Frick, Amanda, Kummer, Natalie, Moraleda, Ana and Weyermann, Céline (2020) Changes in latent fingermark glyceride composition as a function of sample age using UPLC-IMS-QToF-MSE. Analyst, 145 (12). pp. 4212-4223. ISSN 0003-2654

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Official URL: https://doi.org/10.1039/d0an00379d

Abstract

The composition of fingermark residue has been an important topic in forensic science, mainly in efforts to better understand and eventually improve the efficacy of latent fingermark detection methods. While the lipid fraction has been extensively studied, there is currently little information about how the glyceride fraction of latent fingermarks is chemically altered over time following deposition. A previously reported untargeted ultra performance liquid chromatography-ion mobility spectrometry-quadrupole time-of-flight mass spectrometry (UPLC-IMS-QToF-MSE) method was used to investigate changes over time in fingermark di- and triglycerides. Charged latent fingermark samples from 5 donors were analysed up to 28 days following deposition. Significant changes in glyceride composition occurred with increased sample age, attributed primarily to the oxidation of unsaturated triglycerides through ozonolysis. Considerably fewer unsaturated TGs were identified in samples 7 and 28 days following deposition, while mono- and diozonides of these lipids were identified as major components of aged samples. Additional compounds were identified as possible aldehyde and carboxylic acid derivatives resulting from the reaction of water with ozonolysis intermediates. While the onset of these processes occurred rapidly following deposition, continuing oxidation over time was seen via the progressive ozonolysis of diunsaturated triglycerides. These results represent a further step towards understanding the factors affecting fingermark composition, ageing and subsequent detection under operational conditions.

Item Type: Article
Subjects: C100 Biology
F100 Chemistry
F400 Forensic and Archaeological Science
Department: Faculties > Health and Life Sciences > Applied Sciences
Depositing User: John Coen
Date Deposited: 21 May 2020 14:28
Last Modified: 17 Sep 2020 14:45
URI: http://nrl.northumbria.ac.uk/id/eprint/43225

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