title: Near infrared spectral imaging for the analysis of dynamite residues on human handprints.
abstract: This study examines the utility of near infrared hyperspectral imaging (NIR-HSI) combined with chemometrics for the detection of dynamite residues on human handprints. Polyvinyl sheets containing dynamite residues were then analysed with the NIR-HSI system. A spectral library was developed by using partial least squares-discriminant analysis model (PLS-DA) to detect and classify the pixels contaminated with the dynamite residues. Values of sensitivity and specificity of 100% were obtained for both calibration and cross validation of dynamite and ammonium nitrate. The results were tested in real human handprints. Seven volunteers deposited their handprints into polyvinyl transparent sheets after the manipulation of a common type of dynamite which was mainly composed by ammonium nitrate. These results highlight the extremely high potential and capability of NIR-HSI combined with chemometrics for the fast and easy identification of explosive residues and additionally, its potential competence to detect the explosive manipulation.
authors.affiliation: Inquifor Research Group, Department of Analytical Chemistry, Physical Chemistry and Chemical Engineering and University Institute of Research in Police Sciences (IUICP), University of Alcalá, Ctra. Madrid-Barcelona Km 33.600, 28871 Alcalá de Henares, Madrid, Spain(1).
authors.forename: Ma Ángeles Fernández
authors.initials: MÁ
authors.lastname: de la Ossa
authors.affiliation: Inquifor Research Group, Department of Analytical Chemistry, Physical Chemistry and Chemical Engineering and University Institute of Research in Police Sciences (IUICP), University of Alcalá, Ctra. Madrid-Barcelona Km 33.600, 28871 Alcalá de Henares, Madrid, Spain(1).
authors.forename: Carmen
authors.initials: C
authors.lastname: García-Ruiz
authors.affiliation: Department of Food Sciences, Faculty of Life Sciences, University of Copenhagen, Rolighedsvej 30, DK-1958 Frederiksberg C, Denmark. Electronic address: jmar@life.ku.dk.
authors.forename: José Manuel
authors.initials: JM
authors.lastname: Amigo
mesh_terms: D000328:Adult; D003952:Diagnostic Imaging; D016002:Discriminant Analysis; D053834:Explosive Agents / Q000032:analysis*; D005260:Female; D006225:Hand; D006801:Humans; D016018:Least-Squares Analysis; D008297:Male; D009566:Nitrates / Q000032:analysis; D005996:Nitroglycerin / Q000032:analysis*; D019265:Spectroscopy, Near-Infrared / Q000379:methods*; D055815:Young Adult
chemical_list: D053834:Explosive Agents; D009566:Nitrates; D005996:Nitroglycerin; C006568:ammonium nitrate
keywords: Ammonium nitrate; Dynamite; Handprints; NIR hyperspectral imaging; PLS-DA