Authors: Ricci, Camilla¹; Phiriyavityopas, Phiraporn¹; Curum, Nicholas¹; Chan, K. L. Andrew¹; Jickells, Sue²; Kazarian, Sergei G.¹

Source: Applied Spectroscopy, Volume 61, Issue 5, Pages 94A-102A and 459-569 (May 2007) , pp. 514-522(9)

Publisher: Society for Applied Spectroscopy

Abstract:

In situ attenuated total reflection Fourier transform infrared (ATR-FT-IR) spectroscopic imaging has been used to obtain chemical images of fingerprints under controlled humidity and temperature. The distribution of lipid and amino acid components in the fingerprints from different donors left on the surface of the ZnSe crystal has been studied using an in situ FT-IR spectroscopic imaging approach under a controlled environment and studied as a function of time. Univariate and multivariate analyses were employed to analyze the spectroscopic dataset. Changes in the spectra of lipids with temperature and time have been detected. This information is needed to understand aging of the fingerprints. The ATR-FT-IR spectroscopic imaging offers a new and complementary means for studying the chemistry of fingerprints that are left pristine for further analysis. This study demonstrates the potential for visualizing the chemical changes of fingerprints for forensic applications by spectroscopic imaging.

Keywords: FORENSIC SCIENCE; FINGERPRINTS; CHEMICAL IMAGING; AGING; MULTIVARIATE ANALYSIS; FOURIER TRANSFORM INFRARED SPECTROSCOPY; ATTENUATED TOTAL REFLECTION; ATR-FT-IR SPECTROSCOPY; INFRARED

Document Type: Research article

DOI: http://dx.doi.org/10.1366/000370207780807849

Affiliations: 1: Department of Chemical Engineering, Imperial College London, London, SW7 2AZ, UK 2: School of Biomedical and Health Sciences, King's College London, Franklin-Wilkin's Building, 150 Stamford Street, London SE1 9NH UK

Publication date: 2007-05-01

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