Laser desorption/ionization time-of-flight mass spectrometry of triacylglycerols and other components in fingermark samples |
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Authors: | Emerson Beth Gidden Jennifer Lay Jackson O Durham Bill |
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Affiliation: | Department of Chemistry, University of Arkansas, 345 N. Campus Drive, Fayetteville, AR 72701, USA. |
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Abstract: | The chemical composition of fingermarks could potentially be important for determining investigative leads, placing individuals at the time of a crime, and has applications as biomarkers of disease. Fingermark samples containing triacylglycerols (TAGs) and other components were analyzed using laser desorption/ionization (LDI) time-of-flight mass spectrometry (TOF MS). Only LDI appeared to be useful for this application while conventional matrix-assisted LDI-TOF MS was not. Tandem MS was used to identify/confirm selected TAGs. A limited gender comparison, based on a simple t-distribution and peaks intensities, indicated that two TAGs showed gender specificity at the 95% confidence level and two others at 97.5% confidence. Because gender-related TAGs differences were most often close to the standard deviation of the measurements, the majority of the TAGs showed no gender specificity. Thus, LDI-TOF MS is not a reliable indicator of gender based on fingermark analysis. Cosmetic ingredients present in some samples were identified. |
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Keywords: | forensic science latent fingermarks triacylglycerols lipids laser desorption/ionization time‐of‐flight mass spectrometry |
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