Measuring the water content in freshly-deposited fingermarks

Keisar, Or; Cohen, Yair; Finkelstein, Y.; Kostirya, Natalie; David, Roey Ben; Danon, Albert; Porat, Ze’ev; Almog, Joseph

doi:10.1016/j.forsciint.2018.11.017

Cited by 22 publications

(34 citation statements)

References 16 publications

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“…Nanocomposites are hybrid materials, in which at least one of the components has nanodimensions. There is a difference in behavior between composite materials and nanocomposites, which is related to a high surface in the nanoparticles, resulting in an intense interaction with the matrix in which they are inserted (). For fingerprint analysis, nanoparticles offer the advantage of small surface size and functionalization and luminescence properties that can lead to better resolution and greater selectivity and sensitivity in analysis ().…”

Section: Resultsmentioning

confidence: 99%

“…Many studies describe the composition of such residues as a complex mixture of numerous fatty acids, inorganic compounds, amino acids, and over 400 polypeptides (). From the chemical point of view, a fingerprint is a complex emulsion composed by water (generally between 20% and 70% in freshly deposited fingermarks), endogenous organic, and inorganic compounds secreted by the eccrine glands, sebaceous components (mostly lipids excreted from sebaceous glands, incorporated into the mixture by touching face, hair, and neck), and several exogenous contaminants that adhere to the surface of skin, such as blood, cosmetics, drugs, and food fats ().…”

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confidence: 99%

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Methodologies Applied to Fingerprint Analysis

González

Gorziza

Mariotti

et al. 2020

Journal of Forensic Sciences

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This systematic review deals with the last 10 years of research in analytical methodologies for the analysis of fingerprints, regarding their chemical and biological constituents. A total of 123 manuscripts, which fit the search criteria defined using the descriptor “latent fingermarks analysis,” were selected. Its main instrumental areas (mass spectrometry, spectroscopy, and innovative methods) were analyzed and summarized in a specific table, highlighting its main analytical parameters. The results show that most studies in this field use mass spectrometry to identify the constituents of fingerprints, both to determine the chemical profile and for aging. There is also a marked use of mass spectrometry coupled with chromatographic methods, and it provides accurate results for a fatty acid profile. Additional significant results are achieved by spectroscopic methods, mainly Raman and infrared. It is noteworthy that spectroscopic methods using microscopy assist in the accuracy of the analyzed region of the fingerprint, contributing to more robust results. There was also a significant increase in studies using methods focused on finding new developers or identifying components present in fingerprints by rapid tests. This systematic review of analytical techniques applied to the detection of fingerprints explores different approaches to contribute to future studies in forensic identification, verifying new demands in the forensic sciences and assisting in the selection of studies for the progress of research.

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Section: Resultsmentioning

confidence: 99%

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confidence: 99%

Methodologies Applied to Fingerprint Analysis

González

Gorziza

Mariotti

et al. 2020

Journal of Forensic Sciences

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“…Water is the principal solvent for the other chemicals found within eccrine sweat. Although eccrine sweat contains 98% water, the content deposited in a latent fingermark has been a subject of recent debate with Kent (2016) suggesting it may be as low as 20% and subsequent studies (Keisar et al, 2019) indicating that a range of 20-70% is realistic.…”

Section: Watermentioning

confidence: 99%

The forensic exploitation of fingermark chemistry: A review

Bleay

Bailey

Croxton

et al. 2020

WIREs Forensic Science

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The substances deposited from the fingertip onto a surface during contact between them represent a highly complex range of chemicals that can be exploited in a variety of ways in a forensic investigation. An overview is given of the multitude of chemicals that have been detected in fingermarks, including those occurring in endogenous sweat, metabolites of ingested substances, and exogenous substances picked up on the fingertip. Changes in chemistry that may occur between deposition of the fingermark and its subsequent forensic analysis are discussed, with particular reference to the ways in which these changes have been considered as a means of dating fingermarks. The ways in which fingermark enhancement reagents utilize the different chemicals present to reveal ridge is reviewed, together with how different classes of chemical can be sequentially targeted to optimize the number of fingermarks recovered.A field of increasing interest is the use of advanced analytical techniques incorporating mass spectrometry and imaging capability to simultaneously obtain additional contextual information about the donor of the mark while visualizing the fingermark ridge pattern. Examples are given of how such information can be applied in forensic investigations. It is concluded that an extensive "tool kit" of fingermark enhancement processes is already available to utilize the different chemicals present, and the advances that can be made in this field using conventional approaches are limited. There is, instead, significant potential to utilize analytical techniques to forensically exploit the chemical information within fingermarks but there are also significant barriers to their implementation in this way.

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“…23 The pH of ngerprint residue however, is unknown, and likely is variable both within and between donors. Additionally, fresh ngerprints consist of 20-70% water, as was recently reported by Keisar et al, 24 but will eventually dry up, since evaporation will start right aer deposition. The precise mechanism of amino acid racemization in ngerprints therefore remains unknown and requires further research.…”

Section: Discussionmentioning

confidence: 56%