Fortschritte in der Fingerabdruckanalyse

Abstract

Fingerabdrücke werden seit dem späten 19. Jahrhundert in forensischen Untersuchungen zur Identifizierung von Personen genutzt. Darüber hinaus hat sich inzwischen aber gezeigt, dass Fingerabdrücke noch viel mehr Informationen über ein Individuum liefern können. Wir stellen hier bemerkenswerte Fortschritte bei Fingerabdrucktechnologien vor, mit denen sich, simultan zur Identitätsklärung, chemisch nachweisen lässt, ob eine Person Rauschgifte eingenommen oder mit Sprengstoffen oder Rauschgiften hantiert hat.

Near‐Infrared‐Light‐Mediated Imaging of Latent Fingerprints based on Molecular Recognition

“…A fingerprint on a smooth glass microscope slide (Figure 3 a) was treated with UCNPs-LBA solution. A similar (1) and the corresponding magnified image (2). Compared to smooth surfaces, fingerprints on semiporous substrates such as plastics are usually more difficult to detect.…”

“…It showed a clear and bright luminescence image (Figure 3 b1) under excitation with NIR light, and the ridge pattern details could be easily recognized at higher magnification (Figure 3 b2). d) Luminescence image of fingerprint on Petri dish (1) and the corresponding magnified image (2). A similar (1) and the corresponding magnified image (2).…”

“…Compared to smooth surfaces, fingerprints on semiporous substrates such as plastics are usually more difficult to detect. f) Luminescence image of fingerprint on the coin (1) and the corresponding magnified image (2). c) Photograph of a Petri dish with a latent fingerprint in the black circle.…”

“…c) Luminescence image of fingerprints treated with QDs solution(1), QDs-LBA(2), and the corresponding magnified image (3). Inset: FAM-labeled lysozyme-binding aptamer, and QDs and UCNPs functionalized with a lysozyme-binding aptamer.…”

Near‐Infrared‐Light‐Mediated Imaging of Latent Fingerprints based on Molecular Recognition

“…[1] Some fingerprints are visible if the fingers are contaminated with blood or paint, and latent fingerprints are invisible to the bare eye. [2] The basic principle of latent-fingerprint detection is the generation of an optical contrast between the ridges of the fingerprint and the affected surface. [3] Until now, various techniques have been developed for fingerprint imaging.…”